ANSI Y32.2-1975.pdf
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ANSI Y32.2-1975 CSA Z99·1975 IEEE Std 315-1975 Revision of ANSI Y32.2-1972 CSA Z99-1972 IEEE Std 315-1971
American National Standard Canadian Standard IEEE Standard
Graphic Symbols for Electrical and Electronics Diagrams (Including Reference Designation Letters)
Sponsor
IEEE Standards Coordinating Committee 11, Graphic Symbols Secretariat for American National Standards Committee Y32
American Society of Mechanical Engineers Institute of Electrical and Electronics Engineers
Approved October 31,1975
American National Standards Institute Approved October 9, 1975
Canadian Standards Association Approved September 4, 1975
Institute of Electrical and Electronics Engineers Adopted for Mandatory Use October 31,1975
Department of Defense, United States of America
,
I
Approved September 4, 1975
IEEE Standards Board Warren H. Cook, Vice Chairman
Joseph L. Koepfinger, Chairman Sava I. Sherr, Secretary Jean Jacques Archambault Robert D. Briskman Dale R. Cochran Louis Costrell Frank Davidoff Jay Forster Irvin N. Howell. Jr
Stuart P. Jackson Irving Kolodny William R. Kruesi Benjamin J. Leon Anthony C. Lordi Donald T. Michael Voss A. Moore William S. Morgan
William J. Neiswender Gustave Shapiro Ralph M. Showers Robert A. Soderman Leonard Thomas Charles L. Wagner William T. Wintringham
The individual symbols contained in this standard may be copied, reproduced, or employed in any fashion without permission of the IEEE. Any statement that the symbols used are in conformance with this standard shall be on the user's own responsibility.
© Copyright 1975 by the Institute of Electrical and Electronics Engineers, Inc. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. September 1988 Printing
Foreword (This foreword is not a part of American National Standard Graphic Symbols for Electrical and Electronics Diagrams, Y32.2-1975 [IEEE Std 315-1975])
This American National Standard is a revision and expansion of American National Standard Graphic Symbols for Electrical and Electronics Diagrams, Y32.2-1970 (IEEE Std 315-1971). A variety of specialized symbols originally used for aircraft applications have been added to make this standard more comprehensive. To improve coordination with IEC pUblication 117, IEC approved versions of capacitor, transformer, delay, associated conductors and specialized ground symbols have been added as alternates to those long used and standardized in the United States. A num ber of small changes have made the existing material more closely parallel to IEC Publication 117. Symbols have been added to cover additional devices in the photo sensitive semiconductor and specialized semiconductor fields, as well as for an electronic flash lamp. Known errors have been corrected and some items have been clarified. The reference designation class letters were revised to include the added new device symbols and to clarify the DS and LS categories. "D" is now listed as an alternate to the common "CR" for the common semiconductor diode family of devices. All of the symbols are designed so that their connection points fall on a modular grid. This should help those who use a grid basis for the preparation of diagrams. By proper enlargement of the symbols the usual coordinate-grid sizes can be matched. Most symbols appearing in this standard were reproduced from original drawings prepared for the Mergenthaler Diagrammer. A substantial effort has been made to have this American National Standard compatible with approved International Electronical Commission (lEC) Recommendations (lEC Publication 117, in various parts). Electrical diagrams are a factor in international trade; the use of one common symbol language ensures a clear presentation and economical diagram preparation for a variety of users. Members of the preparing committee have been active in transmitting USA viewpoints to the cognizant IEC Technical Committee. Alternative symbols are shown only in those cases where agreement on a common symbol could not be attained at this time. It is hoped that the number of alternative symbols will be reduced in future editions. The symbols in this standard represent the best consensus that can be attained at this time. Standardization, however, must be dynamic, not static, and any solution of a problem should be tested through use and revised if necessary. It is anticipated that the contents of this standard will be modified as future needs dictate; such modifications will be made available through the issuance of approved supplements. Suggestions for improvement are welcomed. They should be addressed to: Secretary, IEEE Standards Board Institute of Electrical and Electronics Engineers, Inc. 345 East 47 Street New York, N.Y. 10017 This standard has been prepared by the Institute of Electrical and Electronics Engineers (IEEE) Standards Coordinating Committee for Letter and Graphic Symbols (SCC 11), acting for the Y32.2 Task Group on Graphic Symbols for Electrical and Electronics Diagrams of the American National Standards Committee Y 32, Graphic Symbols and Designations. There has been close cooperation between the industry and DOD representatives to provide one standard that can be universally used, rather than separate documents with their tendency to differ in various respects. While credit for this accomplishment is due all participants and the organizations they represent, particular mention is given to the U.S. Department of Defense, without whose strong support in reaching the objective-standard symbols acceptable to both industry and the military departments-the effort would not have succeeded. This standard is complemented by a number of related standards listed in Section 23.
The American National Standards Committee on Graphic Symbols and Designations, Y32, had the following personnel at the time it approved this standard: Charles A. Fricke, Chairman Conrad R. Muller, Vice Chairman, Electrical and Electronics James L. Fisher, Jr., Vice Chairman, Pictographic Symbols James R. Couper, Vice Chairman, Chemical and Process George Platt, Vice Chairman, Mechanical Alvin Lai, Secretary
Organization Represented Acoustical Society of America American American American American American American American American American
Chemical Society ............................................ Gear Manufacturers Association ................................ Institute of Chemical Engineers ................................. Institute for Design and Drafting ................................ Institute of Industrial Engineers ................................ Institute of Mining, Metallurgical and Petroleum Engineers ............ Society of Agricultural Engineers ............................... Society of Civil Engineers ..................................... Society for Engineering Education ..............................
. . . . . . . . .
American Society of Heating, Refrigerating and Air Conditioning Engineers ...... . American Society of Mechanical Engineers ................................ .
American Society of Sanitary Engineering ................................ . American Welding Society ............................................. . Association of American Railroads ...................................... . Association for Computing Machinery ................................... . Canadian Standards Association ........................................ . lI1uminating Engineering Society ........................................ . Individual Member .................................................. . Institute of Electrical and Electronics Engineers ............................ . Instrument Society of America ......................................... . Mechanical Contractors Association of America ............................ National Association of Plumbing, Heating, Cooling Contractors ............... National Electrical Contractors Association ............................... National Electrical Manufacturers Association .............................
. . . .
National Fluid Power Association ....................................... Society of Automotive Engineers ....................................... Technical Drawing Associates .......................................... Telephone Group ...................................................
. . . .
US Department of the Army, Ordnance .................................. US Department of Commerce, National Bureau of Standards .................. US Department of Commerce, Patent Office ............................... US Department of the Interior ......................................... US Department of the Navy ........................................... Western Union Telegraph Company .....................................
. . . . . .
Name of Representatiue Laurence Batchelder Harry F. Olson Robert F. Schuerer Gerald L. Scott James R. Couper Francis Saint Irving Goldstein Vacant James A. Basselman Vacant I. L. Hill R. T. Northrup N. LaCourte C. W. MacPhee (AIt) R. W. Cockrell A. R. Machell, Jr. O. J. Maha H. E. Walchli James C. Church A. P. Arndt Frank Speight (AIt) M. F. McCorcle P. H. Foley Patrick G. Skelly Arthur C. Gannet (AIt) A. Hendry L. E. Barbrow John E. Kaufman (AIt) Charles A. Fricke G. A. Knapp Sidney V. Soanes Steven A. Wassermann George Platt Louis Costea (AIt) J. R. Mance R. E. White William H. Paules Walter F. Huette F. V. Kupchak R. F. Franciose (AIt) Roland Russo (AIt) Mrs. R. L. Mancini (AIt) James L. Fisher, Jr. H. L. Dubocq W. D. Zbinder H. A. Spielman R. E. Thiemer (Alt) C. A. Nazian Gustave Shapiro D. M. Mills Ray Freeman Vacant Vacant
~
The Task Group on Graphic Symbols, Y32.2, which revised and processed this standard, had the following personnel: C. A. Fricke *, Chairman S. A. Wassermann, Secretary S. J. Balke L. Batchelder L. E. Barbrow V. W. Bennett H. L. Cook D. Drusdow S. K. Ghandi
W. Grasson C. J. Hart A. Hendry, Canadian Liaison G. A. Knapp R. Legg* L. A. Meadowst C. R. Muller*
C. A. Nazian R. V. Rice E. F. V. Robinson:!:, Canadian Liaison J. W. Siefert R. M. Stern* J. Zeno
The IEEE Standards Coordinating Committee on Letter and Graphic Symbols, see 11, had the following membership: C. A. Fricke, Chairman C. R. Muller, Secretary R. B. Augus, Jr, F. K. Becker J. C. Brown J. M. Carroll H. L. Cook E. T. B. Gross
G. A. Knapp L. A. Meadows+ R. V. Rice G. Shapiro J. W. Siefert
S. V. Soanes R. M. Stern L. H. Warren S. A. Wassermann J. C. White
The IEEE Subcommittee on Graphic Symbols, sec 11.1, and the lEe Experts Subcommittee, see 11.6, had the following membership: C. A. Fricke, Chairman SCC 11.1 C. A. Fricke, Chairman pro tern, SCC 11.6 V. W. Bennett I. M. Berger (SeC 11.1) T. L. Bisbee V. Condello H. L. Cook D. Drusdow A. C. Gannett G. A. Knapp E. J. Lombardi (SeC 11.6)
R. Legg J. Lusti (sec 11.6) L. A. Meadows~: C. R. Muller G. Panula (SeC 11.6) R. V. Rice (SeC 11.1) A. I. Rubin (SeC 11.1) F. A. Saint G. Shapiro
* Member of Y32.2 Editorial Committee. :j: Retired.
J. W. Siefert (SeC 11.1) H. Seaman P. G. Skelly (SeC 11.6) S. V. Soanes (sec 11.1) R. M. Stern S. A. Wassermann R. Rondinelli (AIt) W. W. Varnedoe (SeC 11.6) J. Zeno (sec 11.1)
Contents SECTION
PAGE
SECTION
Quick Reference to Symbols .............. 11 Introduction ............................ 19 Section 1 Qualifying Symbols 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1. 9 1.10 1.11 1.12 1.13
Adjustability Variability ........................ Special-Property Indicators ........... Radiation Indicators (electromagnetic and particulate) . . . . . . . . . . . . . . . . . .. Physical-State Recognition Symbols. . . .. Test-Point Recognition Symbol ........ Polarity Markings ................... Direction of Flow of Power, Signal, or Information ................... Kind of Current ................... , Connection Symbols ................ Envelope Enclosure . . . . . . . . . . . . . . . . . . . . . . . .. Shield Shielding ......................... Special Connector or Cable Indicator . . .. Electret ..........................
Section 4 Graphic Symbols for Contacts, Switches, Contactors, and Relays 4.1 4.2 4.3 4.4 4.5
23 23 23 23 24 24
4.6 4.7 4.8 4.9
24 25 25
4.10 4.11
25 4.12 26 26 26
4.13 4.14
Section 2 Graphic Symbols for Fundamental Items (not included in other sections) 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 2.11 2.12 2.13 2.14 2.15 2.16 2.17
4.15 4.16 4.17 4.18 4.19 4.20 4.21 4.22
Resistor.......................... 27 Capacitor ......................... 28 Antenna.......................... 29 Attenuator........................ 30 Battery ............................ 30 Delay Function Delay Line Slow-Wave Structure ................ 30 Oscillator Generalized Alternating-Current Source .. 31 Permanent Magnet .................. 31 Pickup Head ............................. 31 Piezoelectric Crystal Unit ............ , 31 Transducer Accelerometer Motional Pickup Transducer ........... 31 Squib, Electric " ................... 31 Thermocouple ..................... 31 Thermal Element Thermomechanical Transducer ......... 31 Spark Gap Igniter Gap ........................ 31 Continuous Loop Fire Detector ........ 31 Igniter Plug ..... ~ ................... 31
4.23 4.24 4.25 4.26 4.27 4.28 4.29 4.30 4.31 4.32 4.33
Switching Function ................. Electrical Contact. . . . . . . . . . . . . . . . . .. Basic Contact Assemblies ............. Magnetic Blowout Coil . . . . . . . . . . . . . .. Operating Coil Relay Coil ........................ Switch ........................... Pushbutton, Momentary or Spring-Return Two-Circuit, Maintained or Not SpringReturn ... "....................... Nonlocking Switch, Momentary or Spring-Return .... . . . . . . . . . . . . . . .. Locking Switch .................... Combination Locking and Nonlocking Switch .......................... Key-Type Switch Lever Switch ...................... Selector or Multiposition Switch ....... Limit Switch Sensitive Switch . . . . . . . . . . . . . . . . . . .. Safety Interlock . _ . . . . . . . . . . . . . . . . .. Switches with Time-Delay Feature ...... Flow-Actuated Switch ............... Liquid-Level-Actuated Switch ......... Pressure- or Vacuum-Actuated Switch '" Temperature-Actuated Switch ......... Thermostat ........................ Flasher Self-Interrupting Switch . . . . . . . . . . . . .. Foot-Operated Switch Foot Switch ....................... Switch Operated by Shaft Rotation and Responsive to Speed or Direction ..... Switches with Specific Features ........ Telegraph Key ..................... Governor Speed Regulator .................... Vibrator, Interrupter ................ Contactor ......................... Relay ............................ Inertia Switch ...................... Mercury Switch .................... Aneroid Capsule (air pressure) Operated Switch ..................
36 36 36 37 37 37 38 38 38 38 38 38 38 39 39 40 40 40 40 40 40 40 41 41 41 41 41 41 41 42 42 42 43
Section 5 Graphic Symbols for Terminals and Connectors 5.1 5.2 5.3
Section 3 Graphic Symbols for Transmission Path Transmission Path Conductor Cable Wiring ............................ 3.2 Distribution Lines Transmission Lines .................. 3.3 Alternative or Conditional Wiring. . . . . .. 3.4 Associated or Future ................ 3.5 Intentional Isolation of Direct-Current Path in Coaxial or Waveguide Applications ..................... 3.6 Waveguide ........................ 3.7 Strip-Type Transmission Line. . . . . . . . .. 3.8 Termination....................... 3.9 Circuit Return ..................... 3.10 Pressure Tight Bulkhead Cable Gland Cable Sealing End .................. ,
PAGE
3.1
5.4 5.5 5.6
32 33 34 34
5.7
Terminals......................... Cable Termination .................. Connector Disconnecting Device Jack Plug ............................. Connectors of the Type Commonly Used for Power-Supply Purposes .......... Test Block ........................ Coaxial Connector Coaxial Junction ................... Waveguide Flanges Waveguide Junction .................
44 44
44 45 45 45 45
Section 6 Graphic Symbols for Transformers, Inductors, and Windings
34 34 34 34 34
6.1 6.2
35
7
Core ............................. 47 Inductor Winding Reactor Radio-Frequency Coil Telephone Retardation Coil ........... 47
SECTIO~
6.3 6.4 6.5
PAGE
SECTION
Transductor Saturable-Core Inductor Saturable-Core Reactor. . . . . . . . . . . . . .. 47 Transformer Telephone Induction Coil Telephone Repeating Coil ............ 48 Linear Coupler ..................... 50
Section 12 Graphic Symbols for Readout Devices 12.1 12.2
7.5 7.6 7.7
Electron Tube ..................... General Notes ...................... Typical Applications ................ Solion Ion-Diffusion Device ................ Coulomb Accumulator Electrochemical Step-Function Device ... Conductivity Cell . . . . . . . . . . . . . . . . . .. Nuclear-Radiation Detector Ionization Chamber Proportional Counter Tube Geiger-Muller County Tube ...........
13.1 13.2 13.3 13.4 13.5
51 51 52 53
13.6
53 53
13.7 13.8
53
14.1
8.1
14.2 14.3
54 54 55 55
14.4
9.4 9.5
Fuse ............................. Current Limiter .................... Lightning Arrester Arrester ( electric surge) Gap ............................. Circuit Breaker . . . . . . . . . . . . . . . . . . . .. Protective Relay ....................
57 58 58
15.1 15.2 15.3 15.4
58 59 59
15.5 15.6 15.7 15.8 15.9
60 60
15.10 15.11 15.12
60 60 61
15.13 15.14 15.15 15.16 15.17 15.18 15.19
Section 10 Graphic Symbols for Acoustic Devices 10.1 10.2 10.3 10.4
Audible-Signaling Device ............. Microphone Telephone Transmitter. . . . . . . . . . . . . .. Handset Operator's Set ..................... Telephone Receiver Earphone Hearing-Aid Receiver ................
62 62
66 67 67 68
Mechanical Connection Mechanical Interlock ................ Mechanical Motion .................. Clutch Brake ............................ Manual Control ....................
69 69 69 69
Discontinuity ..................... Coupling .......................... Directional Coupler ................. Hybrid Directionally Selective Transmission Devices ......................... Mode Transducer ................... Mode Suppressor ................... Rotary Joint ....................... Nonreciprocal Devices ............... Resonator Tuned Cavity ... . . . . . . . . . . . . . . . . . .. Resonator (Cavity-Type) Tube ......... Magnetron ........................ Velocity-Modulation (VelocityVariation) Tube ................... Transmit-Receive (TR) Tube .......... Traveling-Wave-Tube ................ Balun ............................ Filter ............................ Phase Shifter ...................... Ferrite Bead Ring ................... Line Stretcher .....................
70 70 71 71 71 71 71 71 72 72 72 72 72 72 73 73 73 73 73
Section 16 Graphic Symbols for Composite Assemblies
62
16.1
62
Section 11 Graphic Symbols for Lamps and Visual-Signaling Devices 1 1.1 11.2
65 65 65 65
Section 15 Graphic Symbols Commonly Used in Connection with VHF, UHF, SHF Circuits
55
Section 9 Graphic Symbols for Circuit Protectors 9.1 9.2 9.3
Rotating Machine. . . . . . . . . . . . . . . . . .. Field, Generator or Motor ............ Winding Connection Symbols. . . . . . . . .. Applications: Direct-Current Machines ... Applications: AI terna ti ng-Curren t Machines . . . . . . . . . . . . . . . . . . . . . . .. Applications: Alternating-Current Machines with Direct·Current Field Excitation ..... ~ .................. Applications: Alternating- and DirectCurrent Composite ................ Synchro ..........................
Section 14 Graphic Symbols for Mechanical Functions
Section 8 Graphic Symbols for Semiconductor Devices Semiconductor Device Transistor Diode ............................ 8.2 Element Symbols . . . . . . . . . . . . . . . . . .. 8.3 Special-Property Indicators ........... 8.4 Rules for Drawing Style 1 Symbols ..... 8.5 Typical Applications, Two-Terminal Devices ......................... 8.6 Typical Applications, Three- (or more) Terminal Devices .................. 8.7 Photosensitive Cell .................. 8.8 Semiconductor Thermocouple ......... 8.9 Hall Element Hall Generator ..................... 8.10 Photon-Coupled Isolator ............. 8.11 Solid-State Thyratron. . . . . . . . . . . . . . ..
Meter Instrument . . . . . . . . . . . . . . . . . . . . . . .. 64 Electromagnetically Operated Counter Message Register. . . . . . . . . . . . . . . . . . .. 64
Section 13 Graphic Symbols for Rotating Machinery
Section 7 Graphic Symbols for Electron Tubes and Related Devices 7.1 7.2 7.3 7.4
PAGE
16.2 16.3 16.4 16.5
La m p . . . . . . . . . . . . . . . . . . . . . . . . . . .. 63 Visual-Signaling Device ............... 63
8
Circuit Assembly Circuit Subassembly Circuit Element .................... Amplifier ......................... Recti fier . . . . . . . . . . . . . . . . . . . . . . . . .. Repeater. . . . . . . . . . . . . . . . . . . . . . . . .. Network Artificial Line (other than delay line) ....
74 74 74 75 75
SECTION
PAGE
Phase Shifter Phase Changing Network ............. 16.7 Chopper .......................... 16.8 Diode-Type Ring Demodulator Diode-Type Ring Modulator. . . . . . . . . .. 16.9 Gyro Gyroscope Gyrocompass . . . . . . . . . . . . . . . . . . . . .. 16.10 Position Indicator ................... 16.11 Position Transmitter ................. 16.12 Fire Extinguisher Actuator Heads
SECTION
16.6
21.3 21.4 21.5
75 75 75
Operational Amplifier ............... Summing Amplifier ................. Integrator (Amplifier) ............... Electronic Multiplier ................ Electronic Divider .................. Electronic Function Generator. . . . . . . .. Generalized Integrator ............... Positional Servomechanism ........... Function Potentiometer ..............
22.1 22.2
75 75 75 75
22.3 22.4 22.5 22.6
76 76 76 76 76 76 76 76 76
Digital Logic Functions .............. 76
Appendix C Revised or Deleted Symbols (ANSI Y32.2-1970) ................... 86 Appendix D Revised or Deleted Symbols (USAS Y32.2-1967) .................. 87
78 78 78 78 79 79
Appendix E Revised or Deleted Symbols (USAS Y32.2-1962 & Supplement USAS Y32.2a-1964 or MIL-STD-151A) ................................. 92
Section 21 Graphic Symbols Commonly Used on System Diagrams, Maps, and Charts (Generating Stations and Substations) 21.1 21.2
81 83 83
Appendix B Reference Data-IEC Publication 117 Recommended Graphical Symbols ............................. 85
Introduction ....................... 77 Data-Flow Code Signals .............. 77 Functional Circuits. . . . . . . . . . . . . . . . .. 77
Radio Station . . . . . . . . . . . . . . . . . . . . .. Space Station ...................... Exchange Equipment ................ Telegraph Repeater ................. Telegraph Equipment ................ Telephone Set .....................
81 81
Appendix A Cross Reference List of Changed Item Numbers ............... , 85
Section 20 Graphic Symbols Commonly Used on System Diagrams, Maps, and Charts (Communications Equipment) 20.1 20.2 20.3 20.4 20.5 20.6
81
Section 100 Canadian Standard Z99 Modifications to American National Standard Y32.2-1975 ................. 84
Section 19 Graphic Symbols for SpecialPurpose Maintenance Diagrams 19.0 19.1 19.2
Class Designation Letter ............. , Special Considerations for Class Designation Letter Assignment ...... , Item Names ....................... Class Designation Letters (alphabetical list) ............................ Item Names (alphabetical list) ......... Item Designations, IEC 113-2 ......... ,
Section 23 Referenced Standards ....... ' 84
Section 18 Graphic Symbols for Digital Logic Functions 18.1
Thermoelectric Generating Station. . . . .. 80 Prime Mover ....................... 80 Substation........................ 80
Section 22 Class Designation Letter
Section 17 Graphic Symbols for Analog Functions 17.1 17.2 17.3 17.4 17.5 17.6 17.7 17.8 17.9
PAGE
Appendix F Cross-Reference List of Class Designation Letters. IEC 113-2 vs. ANSI Y32.2 ............................... 94
Generating Station .................. 80 Hydroelectric Generating Station ....... 80
Index ..................... follows page 97
9
Contents Arranged by Subject SUBJECT Acoustic devices Analog computers Antennas Assemblies, composite Attenuators Basic items Batteries Block symbols for charts Block symbols for maps Capacitors Circuit breakers Circuit protectors Circuit returns Class designation letters Coils Composite assemblies Computers, analof Computers, digita Connectors Contacts Contactors Data How code signals Delay lines Digital computer logic biodes Distribution lines Electron tubes Functional s~bols Fundamenta items Fuses Generating stations Generators Grounds High-frequency devices Indicators, special-property Inductors Instruments Jacks Lamps Logic diagrams
SECTION
SUBJECT
10 17
Mechanical functions Meters Microwave devices Motors Path, transmission Permanent magnets Pickups Piezoelectric crystals Plugs Primary detectors Protectors, circuit Qualifiers Readout devices Reference designations Reference standards Relays Resistors Rotating machinery Semiconductor devices SHF circuit devices Signaling devices, audible Signaling devices, visual Spark gaps Special-property indicators Squibs, electric Switches Synchros System diagrams Terminals Thermal elements Thermocou pIes Transformers Transistors Transmission path Tubes, electron UHF circuit devices Visual-signaling devices VHF circuit devices Waveguides Windings
2
16 2 2 2
20 20 2 9 9 3 22 4,6 16 17 18 5 4
4
19 2 18 8 3 7 19 2 9 21 13 3 15 1,8 6 12 5 11 18
10
SECTION
~
14 12 15 13 3 2 2 2
5 2 9 1,8,20 12 22 23 4 2
13 8 15 10 11
2
1,8 2 4
13 20 5 2 2 6 8 3 7
15 11
15 3 6,13
'~
Quick Reference to Symbols 1. Qualifying Symbols
2. Fundamental Items
1.1 Adjustability Variability
2.1 Resistor
/ / / ./ / / /~ T
-H-
r
-)\--
-H-
2.3 Antenna
J
1.3 Radiation Indicators
1.4 Physical State Recognition Symbols
•
17 If
--.L
rh
[QF
+ =t + Z
• T
2.5 Battery
~~
1.6 Polarity Markings
2.17 Ignitor Plug
3. Transmission Path
2.4 Attenuator
1.5 Test-Point Recognition Symbol
3.1 Transmission Path Conductor Cable Wiring
2.6 Delay Function Delay Line Slow-Wave Structure
+
.LJ
. tJ
i~1
ili.iil
2.7 Oscillator Generalized Alternating-Current Source
1.7 Direction of Flow of Power, Signal, or Information
1.9 Connection Symbols
+ o
1.10 Envelope Enclosure
o o
*
±
±
SP\.IC(
--+--
--eI
2.9 Pickup Head
)))))
.....
--c=>
--~
--CY
--~
--~
--B --
2.10 Piezoelectric Crystal Unit
2.11 Primary Detector Measuring Transducer
~ I
o IIIII
o JJJJJ
--H----
==}-{-
--i* • t-3.2 Distribution lines Transmission lines
F
S
T
V
@-2.12 Squib, Electrical
--e--
1.11 Shield Shielding
1.12 Special Connector or Cable Indicator
p
2.8 Permanent Magnet 1.8 Kind of Current
L
--
2.16 Continuous Loop Fire Detector (temperature sensor)
2.2 Capacitor
1.2 Special-Property Indicators )(
2.15 Spark gap Igniter gap
2.13 Thermocouple
3.3 Alternative or Conditioned Wiring
v
--< -
~
3.4 Associated or Future
r'
1.13 Electret
2.14 Thermal Element Thermomechanical Transducer
11
3.5 Intentional Isolation of Direct·Current Path in Coaxial or Waveguide Applications
Quick Reference to Symbols 4.6 Switch
3.6 Waveguide
o
0-'10
o
~o
---- -- - ---+,
J
(71
0
I
err
t
4.19 Pressure- or Vacuum·Actuated Switch
+
~fomcntary
4.9 Nonlocking Switch, Spring-Return
or
0--
t
4.20 Temperature.Actuated Switch
3.10 Pressure-Tight Bulkhead Cable Gland Cable Sealing End
-a-
4.10 Locking Switch
4. Contacts, Switches, Contactors, and Relays
rv
4.2 Electrical Contact
o 0---
~
'1
0
~
4.11 Combination locking Switch
--.-..
4.21 Thermostat
,
,
4.1 Switching Function
o---v
Locking
and
Non-
4.22 Flasher Self.interrupting switch
~
4.12 Key·Type Switch Lever Switch
~
4.24 Switch Operated by Shaft Rotation and Responsive to Speed or Direction
o
--0-
o----e.-
4.13 Selector or Multiposition Switch
4.3 Basic Contact AssembJies
r
~ 1 T I
a-
Te
T
1.1.1.
--0
--r
tr:
i,\
j~
~~~
t
~
,
/0
00
o
o
¥.
¥~ 11,.,
1 TDC
T
4.25 Switches with Specific Features
o
e:900000~
o
o
o
, 6
;-!f-->- -
4.26 Telegraph Key
4.4 Magnetic Blowout Coil
I I
~
I
I
I
4.27 Governor Speed Regulator
I
+I
4.14 Limit Switch Sensitive Switch
I
1%1-
(J:
I I I
:la::::tmlll HIm
4.5 Operating Coil Relay Coil
-{}-
"
4.23 Foot·Operated Switch Foot Switch
orr
A.-
o
* V
lOC
4.17 Flow·Actuated Switch
o
LA
•
~
o---C' 100
4.18 Liquid-Level·Actuated Switch
a+b ~o
3.9 Circuit Return
t ®
or Spring-
4.8 Two.Circuit, ~Iaintaillcd or Sot Spring.Re'urn 4-
~
'" 100
~fomentary
o
3.8 Termination
~o A'
'TDC "
o-'-0
--
---j
J_
I
4.7 Pushbutton. Return
3.7 Strip-Type Transmission Line
4.16 Switches with Time·Delay Feature
- (-
J_
ctI::ZZIol I
<
c?-- f--
I I I
G
~--
4.15 Safety Interloek
-\}-
12
ell::Z::Zl
4.28 Vibrator Interrupter
LQ]
0
Quick Reference to Symbols 4.29 Contact or
.L.L.L
.tJ
T-T-T
~
5.4 Connectors of the Type Commonly Used for Power-Supply Purposes
--.
~
-).
--<
IEC
See Note 5.3.3A OR
B
OR
~
IEC
*See Note 5.3.3.1 A
5.3.3.2 Plug (usually movable) OR
S('e Note 5.3.3;\
See Note 5.1.2A
OR
5.1.2.4 Devices with reference point (such as a boss, colored dot, index pin, index tab, or bayonet pin)
o
See Note 5.1.1.1A 5.1.2 Terminals for electron tubes, semiconductor devices, etc Used primarily in application-data tenninal diagrams for electron tubes, semiconductor devices, and other devices having terminations of similar type.
5.1.2.5 Terminals connected to metallic envelop~ or enclosure
5.1.2.1 Base-pin terminals (electron tubes, etc); pin terminals (semiconductor devices, etc)
5.2 Cable Termination Line shown on left of symbol indicates cable.
5.3 Connector Disconnecting Device Jack ~ Plug El The contact symbol is not an arrowhead. It is larger and the lines are drawn at a SO-degree angle. 5.3.1 Female contact
5.3.4.2 Application: engaged 4-conductor connectors; the plug has 1 male and 3 female contacts with individual contact designations shown in the complete-symbol column ,.7A>-r lEe
5.3.3 Connector assembly, movable or stationary portion; jack, plug, or receptacle
See Note 5.1.2A 5.1.2.2 Envelope tenninals
TER~=::AL~ FLEXIBLE LEAD
5.3.4.1 Application: engaged 4-conductors (female plug - male receptacle shown)
-
• See Note 19.2.1B 19.5.7 Digital logic elements See Section 18 19.2.8 Composite circuit (other than those covered by symbols 19.2.1 through 19.2.6)
-1*r
·See Note 19.2.1B
·See Note 19.2.1B
Cross References
NOTES: 1. See Introduction for general information (note especially A3.l). 2. Symbols for single-line ,one-line) diagrams appear at tho left. symbols for complete diagrams at the right, and symbols suitable for both purposes are centered in each column.
77
SECTION 20 Communications Equipment 20.1 to 20.4.5.3
SECI'ION 20 Communications Equipment 20.1 to 20.4.5.3
Graphic Symbols Commonly Used on System Diagrams, Maps, and Charts
20.3.2 Automatic switching
20.1.7 Passive relay
20.1 Radio Stati9n Other antenna symbols may be used to indicate specific types. NOTE 20.1A: The asterisk is Dot part of the symbol: identUlcatioD of the type of statioD may be added within or adjacent to the symbol.
20.1.1 General
EJm
f~
20.3.3 Manual switchboard
20.2 Space Station 20.2.1 General 20.4 Telegraph Repeater
The letter "T" may be omitted if no fusion will result.
*
20.2.2 Active space station
COD-
20.4.1 One-way simplex operation
-0T
• See Note 20.1A 20.1.2 Portable
IEC
20.4.1 Two-way simplex operation T
20.2.3 Passive space station
-{2}-
~
20.4.3 Duplex operation T
-{2}-
20.1.3 Mobile
20.2.4 Earth station used for tracking a space station (shown with a paraboloiaal antenna) 20.1.4 Direction-finding
IEC
20.4.4 Qualifying symbols The following symbols are restricted to use with the symbols in item 20.4 of this standard. 20.4.4.1 Polar direct-current ( double current)
+ 20.4.4.2 Neutral direct-current (single current)
+ OR o
20.2.5 Application: earth station of a communication service via space station 20.1.5 Radio beacon
0 OR - OR 0
lEe
+ 0 20.4.4.3 Alternating-current
o
20.4.5 Applications: 20.4.15.1 Polar direct-current for duplex operation T
-u -..ff7L~ 20.3 Exchange Equipment 20.1.8 Controlling
20.3.1 General NOTE 20.3.1A: The asterisk is DOt part of the symbol. Replace the asterisk with iDformatiOD to specify a particular applicatioD.
lEe
20.4.5.2 Polar direct-current/neutra1 direct-current for one-way simplex operation T
Y7L: U
lEe
20.4.5.3 Polar direct-current/alternating-current for one-way Simplex operation
D
T
• See Note 20.3.1A
I4....!J Y7L~
lEe
NOTES: 1. See Introduction for general infonnation (note especially A3.1). 2. Symbols for single-line ,one-line) diagrams appear at the left. symbols for complete diagrams at the right. and symbols suitable for both purposes are centered in each column.
78
SECTION 20 Communications Equipment 20.4.5.4 to 20.6.12
SECflON20 Communications EqUipment 20.4.5.4 to 20.6.12
Graphic Symbols Commonly Used on System Diagrams, Maps, and Charts
20.4.5.4 Regenerative type for one-way simplex operation
20.6.3 Common-battery
20.5.1 Applications: 20.5.1.1 Tape-printing receiver
20.6.4 Dial-type 20.5 Telegraph Equipment 20.5.1 General NOTE 20.S.IA: The letter '-r" may be
20.5.1.2 Tape-printing receiver with keyboard transmitter re-
placed by a suitable quaUfyiDg symbol from item 20.5.6.
.-R L!.;J
lEe
20.6.5 Pushbutton dialing
20.5.1.3 Printing reperforator
·-u
~ 20.5.2 Transmitter
@
lEe
20.5.1.4 Page-printing receiver
lEe
20.6.6 With two or more extension lines
~~ I:tm!]
20.5.3 Receiver 20.5.1.5 Page-printing receiver with keyboard transmitter
20.5.4 Two-way Simplex
NOTE 20.6.4A: The dots may be omitted if no confusion would result.
.-J""Dl L!.!J
20.6.1 With coin box
lEe
20.6.8 With ringing generator
20.5.1.6 Facsimile receiver
20.5.5 Duplex 20.5.7.1 Keyboard perforator
--§ 20.5.6 Qualifying symbols The follOwing symbols are restricted to use with the symbols in Section 20.5 of this standard. 20.5.6.1 Tape printing lEe
20.5.6.2 Tape perforating; perforated taFt» lEe
20.5.6.3 Simultaneous printing on and perforating of one tape -e-
·IEe
lEe
20.5.7.8 Automatic transmitter using perforated tape
20.5.1.9 Separate reperforator and automatic transmitter with continuous tape feed
J"=1,,_,FL -l......J· w··
20.6.10 Amplifier-type
20.6.11 Sound-powered
lEe
20.6.12 Key or pushbutton type with special facilities (other than dialing or multiline operation)
20.6 Telephone Set
20.5.6.4 Page printing 20.6.1 General
o
20.6.9 Loudspeaker-type
lEe
20.5.6.5 Keyboard e
e
lEe
20.5.6.6 Facsimile
20.6.2 Local-battery
@
Cross References
lEe
NOTES: I. See Introduction for general information (note especially A3.1). 2. Symbols for single-line ,one-line) diagrams appear at the left, symbols for complete diagrams at the right, and symbols suitable for both purposes aJe ceJltered in each column.
79
SECTION 21 Generating Stations and Substations 21.1 to 21.5.2
Graphic Symbols Commonly Used on System Diagrams, Maps, and Charts 21.3.4 Nuclear energy fueled
21.1 Generating Station NOTE 21.1A: Symbols for "planned" applications appear at the left; symbols for "in service" applications appear at the right. NOTE 21.1B: The preferred symbol is the square, but if necessary, a rectangle may be used.
21.3.5 Geothermic
NOTE 21.1C: Relative sizes of symbols are shown. Symbol size may be reduced for smallsize diagrams. See also paragraph A4.S of the Introduction.
21.1.1 General See Note 21.1A
21.4 Prime Mover (qualifying symbols)
D
Use if essential to show the type of prime mover in a generating station. See Note 21.1A
21.2 Hydroelectric Generating Station
21.4.1 Gas turbine IEC
See Note 21.1A
D
21.4.1.1 Application: shown for oil- or gas-fueled generating station
21.2.1 General
I
21.4.2 Reciprocating engine
21.2.2 Run of river
21.4.2.1 Application: shown for oil- or gas-fueled generating station 21.2.3 With storage
o
21.2.4 With pumped storage
00
IE.
21.5 Substation See Note 21.1A 21.5.1 General Avoid conflict with symbol 13.1.1 if used on the same diagram.
21.3 Thermoelectric Generating Station See Note 21.1A 21.3.1 General
21.5.2 Rectifier substation
B
Use if essential to show type of equipment.
21.3.2 Coal or lignite fueled
§
o
lEe
I EC
§
@
lEe
lEe
...
...
PLA~NED
IN SERVICE
21.3.3 Oil or gns fueled
Cross References
...
PL:\;\;NED
I~
@
.A SERVICE
80
SECTION 21 Generating Stations and Substations 21.1 to 21.5.2
SECTION 22 22.1 to 22.4 A to E
Class Designation Letters· for use in assignment of reference designations for electrical and electronics parts and equipments as described in ANSI Y32.16-1975, Reference Designations for Electrical and Electronics Parts and Equipments
22.1 Class Designation Letter The letters identifying the class of an item shaU be selected in accordance with the list in paragraph 22.4. For reference purposes, see also alphabetical listings of the items and other common and colloquial names in the index. Graphic symbols do not appear in this standard for H, HP, N, WT, and some MP (listed in paragraph 22.4) because they apply to items beyond the scope of this standard. Certain item names and designating letters may apply to either a part or an assembly. 22.2 Special Considerations for Class Designation Letter Assignment 22.2.1 Actual versus intended function If a part serves a purpose other than its generally intended one, the function actually performed shall be represented by the graphic symbol used on the schematic diagram; the class letter shall be chosen from the list in paragraph 22.4 and shall be indicative of its physical characteristics. For example, a semiconductor diode used as a fuse would be represented by the graphic symbol for a fuse (actual function), but the class letter would be D or CR (class of part). If a part has a dual function, the class letter for the principal physical characteristic of the part shall apply.
22.2.2 Assembly versus subassembly The tenn subassembly as used herein shaIJ apply equally to an assembly.
22.2.3 Subassembly versus individual part
22.2.4 Specific versus general The letters A and U (for assembly) shall not be used if more specific class letters are listed in paragraph 22.4 for a particular item. 22.2.5 Inseparable subassemblies Potted, embedded, riveted, or hermetically sealed subassemblies, modular assemblies, printed circuit boards, and integrated circuit packages and similar items which are ordinarily replaced as a single item of supply shall be treated as parts. They shall be assigned the class letter V, unless a more specific class letter is applicable.
22.4 Class Designation Letters: Alpha. betical List
bolometer capacitive termination fixed attenuator EJ inductive termination isolator (nonreciprocal device) pad resistive termination
B
blower motor [) synchro EJ
BT
barrier photocell battery ~ battery cell blocking layer cell photovoltaic transducer solar cell
C
capacitor bushing capacitor EJ
CB
circuit breaker :El network protector
CP
connector adapter EJ coupJing (aperture, loop, or probe) junction (coaxial or waveguide)
D or CR
asymmetrical varistor crystal diode current regulator (semiconductor device) diode (semiconductor type) diode rectifier (semiconductor type) diode-type ring demodulator diode-type ring modulator metallic rectifier EJ photodiode (photosensitive type) stabistor thyristor (semiconductor diode type) varactor
D or VR
breakdown diode (voltage regulator) overvoltage absorber El
DC
directional coupler EJ
DL
delay function delay line EJ slow-wave structure
DS
alphanumeric display device annunciator electrically restored drop general light source indicator (excluding meter or thermometer) El lamp (excluding heating lamp) Ijght-emitting solid-state device manually restored drop photodiode (photoemissivl' type) signal light visual alarm visual indicator visual signaling device
E*
aluminum cell antenna E1
Parts not specifically included in this list shall be assigned a letter or letters from the list below for the part or class most similar in function. Designations for general classes of parts are marked with an asterisk (*) to facilitate designation of parts not specifically included in this standard.
A*I (see also U and 22.2.4)
A group of parts shall not be treated as a su6assembly unless it is one or more of the following: . (a) A plug-in item. (b) A Significant item covered by a separate schematic. ( c) ~ multiapplication item. ( d) Likely to be handled as a replaceable item for maintenance purposes. • Device function designations for power Switchgear, industrial control, and industrial equipment use are not covered by this standard. For typical appUcation of these device function designations, see: (a) American National Standard Manual and Automatic Station Control, Supervisory, and Associated Telemetering Equipments. C37.2-1970. (b) NEMA Standard. Industrial Controls and Systems ICS-1970 (R 1975). (c) Joint Industrial Council Electrical Standards for Mass Production Equipment, EMP-1-1967, and General Purpose Machine Tools, EG P-1-1967 . (d) Military Standard, Designations for Electric Power Switchgear Devices and Industrial Control Devices. MIL-STD-27.
AT
22.3 Item Names In the alphabetically arranged class letter list of paragraph 22.4, item names approved in the Federal Item Identification Guide, CatalOging Handbook H6-1, as of the date of this edition (though additional modifiers may be necessary), are indicated by the symbol f) . For definitions which are not contained in Handbook H6·1, see American National Standard C42.100.
AR
electronic divider electronic function generator (other than rotating) electronic multiplier facsimile set E1 field-polarization amplitude modulator field-polarization rotator general circuit element gyroscope integrator positional servomechanism sensor (transducer to electric power) separable assembly2 separable subassembly telephone set telephone station teleprinter B teletypewriter EI amplifier (other than rotating) fl repeater
I The class letter A is assigned on the basis that the item is separable. The class letter U shall be used if the item is inseparable. 2 For economic reasons. assemblies which are fundamentallY separable may not be so provisioned but may be supplied as complete assemblies. However. the class letter A shall be retained.
81
SECTION 22 22.1 to 22.4 A to E
SECTION 22 22.4 E to S
SECTION 22 22.4 E to S
Class Designation Letters
armature binding post [) cable termination carbon block circuit terminal conductivity cell electrical contact fl electrical contact brush fl electrical shield electrolytic cell ferrite bead rings film element gap (horn, protective, or sphere) Hall element ignitor gap insulator fl lightning arrester fl magnetic core miscellaneous electrical part optical shield permanent magnet fl rotary joint (microwave) short circuit (termination) spark gap splice telephone protector EI telephone protector block El terminal (individual) valve element vibrating reed
HY
circulator directionally selective transmission device hybrid circuit network fl hybrid coil (telephone usage) hybrid junction (magic T)
MP*
brake clutch mechanical interlock mechanical part miscellaneous mechanical part (bearing, coupling, gear, shaft)
J
disconnecting device (receptacle connector) electrical receptacle connector fI jack receptacle (connector, stationary portion) waveguide flange (choke) EI
MT
accelerometer measuring transducer mode transducer motional pickup transducer primary detector
N3
equipment subdivision
P
disconnecting device (plug connector) electrical plug connector :EJ plug (connector, movabJe portion) waveguide flange (plain) EJ
PS
power su pply f] rectifier (complete power-supply assembly)
PU
head (with various modifiers) sound reproducer EJ
Q
semiconductor controlled rectifier semiconductor controlled switch phototransistor (3 terminal) thyratron (semiconductor device) thyratron (semiconductor triode type) transistor EI
K
contactor (magnetically operated) relay fl
L
coil (all not classified as transformers) fI electrical solenoid [) field winding generator field inductor lam p ballast motor field reactor El winding fl
m
EQ
equaJizer equalizing network
F
current limiter (for power cable) fuse EJ fuse cutout
FL
filter f]
G
electronic chopper [) generator fI ignition magneto [) interrupter vibrator fl oscillator rotating amplifier (regulating generator) telephone magneto
H*
hardware (common fasteners, etc)
HP*
hydraulic part
HR
heater [) heating lamp heating resistor infrared lamp EJ thermomechanical transducer
HS
handset [) operator's set
HT
earphone [) electrical headset f1 receiver (excluding radio receiver) telephone receiver
LS
M
audible alarm audible signaling device buzzer EI electric bell f) electric horn f) loudspeaker F1 loudspeaker-microphone siren EI telephone ringer EI telephone sounder f) underwater sound transducer clock El coulomb accumulator elapsed time recorder electric timer electrical counter fl electrochemical step-function device instrument message register meter meter-type level pressure gage oscillograph E oscilloscope EI position indicator thermometer
MG
converter (rotating machine) dynamotor EJ inverter (motor-generator) motor-generator f1
MK
hydrophone microphone f1 telephone transmitter
82
R
function potentiometer instrument shunt fl magnetoresistor potentiometer relay shunt resistor f) rheostat EJ
RE
radio receiver EI
RT
tiallast lam p ballast tube current-regulating resistor EI resistance lamp temperature-sensing element thermal resistor fI thermistor
RV
symmetrical varistor voltage-sensitive resistor fJ
S
contactor (manually, mechanically, or thermally operated) disconnecting device (switch) electrical safety interlock flasher (circuit interrupter)
'Not a class letter, but used to identify a subdivision or an equipment in the Location Numbering Method.
~
~
J
SECTION 22 22.4 S to Z 22.6 governor (electrical contact type) EJ speed regulator (electrical contact type) switch EJ telegraph key telephone dial EJ thermal cutout (circuit interrupter) (not visual) thermostat SQ
Class Designation Letters
w
electric squib EJ explosive squib fusible link igniter squib sensing link
bus bar EJ cable cable assembly (with connectors) coaxial cable conductor distribution line distribution path Goubau line strip-type transmission line transmission line transmission path waveguide EJ wire EJ wiring tiepoint
SR
electrical contact ring EJ rotating contact slip ring
x
fuseholder EJ lampholder EJ socket EJ
T
autotransformer coaxial taper linear coupler telephone induction coil EJ telephone repeating coil EJ transformer EJ waveguide taper
y
magnetostriction oscillator piezoelectric crystal unit quartz crystal unit EJ tuning-fork resonator EJ
Z
artifical line (other than delay line) balun carrier-line trap coupled tunable resonator directional phase shifter (nonreci pro cal ) discontinuity (usually coaxial or waveguide transmission use) E-H tuner general network (where specific class letters do not fit) gyrator mode suppressor multistub tuner phase shifter phase-changing network E1 resonator (tuned cavity) slide-screw tuner
TB
connecting strip terminal board EJ terminal strip test block
TC
semiconductor thermocouple thermocouple EJ thermopile test point
TR
radio transmitter E1
U*' (see also
inseparable assembly integrated-circuit package microcircuit micromodule photon-coupled isolator
A* and 22.2.4) V
VR
(see also
D)
electron tube EJ Geiger-Muller counter tube ionization chamber klystron magnetron phototube proportional counter tube resonator tube (cavity type) solion thyratron (electron tube) traveling-wave tube voltage regulator (electron tube) induction voltage regulator voltage regulator (excluding electron tube) El
4 Not a class leUer, but commonly used to designate test points for maintenance purposes. See American National Standard YI4.15-1966 (RI973).
22.S Item Names: Alphabetical List The index to this standard shows the class designation letter as applicable under the general rules, together with the item number of the representative graphic
symbol.
22.6 Item Designations, IEC 113-2 For reference purposes, Appendix F shows a comparison of the class letters used to identify parts and equipment according to International Electrotechnical Commission (lEC) Publication 113-2 and those assigned in American National Standard Y32.2-1975.
< Not a class letter, but commonly used to designate a tiepoint on connection diagrams. See American National Standard Y 14.151966 (R1973).
83
SECTION 22 22.4 S to Z 22.6
SECI'ION 23 23.1 to 10l)
SECTION 23 23.1 to 100
Referenced Standards and Canadian Standard Z99 Modifications
23.1 Referenced Standards·
100. Canadian Standard Z99 Modifications to American National Standard Y32.2-1975 (IEEE Std 315-1975)
When the following American National Standards are superseded by a revision approved by the American National Standards Institute, the revision shall apply:
While not illustrated in the Standard itself, the widespread practice of using heavier lines in drawing certain symbols can, if followed, result in improved drawing readability. The practice is consistent with Clause A4.3. It is therefore recommended that heavier lines be used to show: 1.10 Envelopes 2.2 Capacitors 2.5 The negative plates of batteries and cells 4.3 The parallel lines in the (4.29 and 4.30) parallel contact symbols 4.7 The moving contact in the push button symbol 7.1 Indirectly heated cathode, anode and combinations including these 8.5 Base symbol as used for semiconductors
American National Standard Reference Designations for Electrical and Electronics Parts and Equipment. Y32.16-1975 (IEEE Std 200-1975) (1) American National Standard Graphic Symbols for Logic Diagram~ Y32.141973 (IEEE Std 91-1973) (1) American National Standard Drafting Practices (Electrical and Electronics Diagrams), Y14.15-1966 (R1973) and Supplements Y14.15a-1970 (R1973) and Y14.15b-1973. American National Standard Abbreviations for Use on Drawings. Y1.1-1972 (2)
These items are illustrated below:
American National Standard Manual and Automatic Station Control, Supervisory, and Associated Telemetering Equipments, C37.2-1970 (2)
~ ---
American National Standard Dimensions of Caps, Plugs, and Receptacles, C73.10-1966 (R1972) through C73.44-1966 (R1972)
-H- -It-
1.10
2.5
2.:l
7.1
1 T
American National Standard Dictionary of Electrical and Electronics Terms, C4 2.1 00-197 2 (IEEE Std 100-1972)
4.3
...L0
o
4.7
~ 8.5
Additionally, it is recommended that the last symbol of Section 3.1.6.3 be avoided in all cases. Where space is at a premium. the possibility of misreading it as a crossover will usually be greater.
• For Military Applications: ( 1 ) Refer to the latest editiOD adopted for mandatory use by the Department of Defense. ( 2 ) Refer to the following military standards (latest edition at time of invitation to bid) in lieu of the AmericaD National StaDdard:
DO NOT USE
+
ANSI C37.2-1970 (in part): use MILSTD-27 Designations for Electric Power Switchgear Devices and Industrial Control Devices. ANSI Y1.1-1972: use MIL-STD-12 Abbreviations for Use on Drawings, Specifications. Standards. and in Technical Documents.
3.1.6.3
Cross References
( 3 ) The following documeDts are listed for purposes of informatiOD oDly: MIL-STD-lOO Engineering Drawing Practices. MIL-M-24100 Manuals, Technical: Functionally Oriented Maintenance Manual (FOMM) Federal Cataloging Handbook H6-1. Section A.
For Graphical Electrical Symbols for Architectural Plans see Appendix F of CSA Standard C22.1-1975.
84
~
APPENDIXES A AND B APPENDIXES A AND B Cross Reference List of Cross Reference List of Changed Item Numbers Changed Item Numbers (These appendixes are not part of 'American National Standard Graphic and IEC Data and lEe Data
Appendixes
Symbols for Electrical and Electronics Diagrams (Including Reference Designation Class Designation Letters) Y32.2-1975 (IEEE Std 315-1975), but are included to facilitate its use.)
Appendix A Cross Reference List of Changed Item Numbers ANSI Y32.2-1970
ANSI Y32.2-1975
1.3.1.1 1.3.1.2 1.3.2.1 1.3.2.2 1.3.3 1.3.3.1 1.3.3.2 2.2.9 2.2.11 2.2.12 2.2.13
1.3.1 1.3.1 1.3.2 1.3.2 1.3.2 1.3.2 1.3.2 2.2.11 2.2.12 2.2.9 2.2.9.1
ANSI Y32.2-1970
ANSI Y32.2-1975
2.2.14 2.2.15 2.2.16 2.2.17 2.3.6.8 2.6.1 (top) 2.6.3 4.2.1.1 (bottom) 4.2.1.2 4.2.1.3 4.2.1.4
2.2.13 2.2.14 2.2.15 2.2.16 14.2.4.1 2.6.4 2.6.4 4.2.1.2 4.2.1.1 4.2.1.2 4.2.1.3
Appendix B Reference Data International Electrotechnical Commission (lEe) Publication 117: Recommended Graphical Symbols The following documents were used for the listing of the IEC symbol (lEe) next to those graphic symbols in this standard that are considered to be in accordance with the graphic symbols in Publication 117. Publication 11 7 Part No.
Publication 117 Part No.
o
6
1
2
3
4
5
General Index (1973) Kind of current, distribution systems, methods of connection and circuit elements (1960) Amendments: 1 (August 1966), 2 (August 1967), 3 (August 1973) Machines, transformers, primary cells, and accumulators, transductors and magnetic amplifiers, inductors (1960) Amendments: 1 (August 1966),2(OctoberI971), 3 (August 1973) Supplement A (April 1974) Contacts, switchgear, mechanical controls, starters, and elements of electromechanical relays (1963) Amendments: 1 (August 1966), 2 (March 1972),3 (August 1973), 4 (May 1974) Supplements: A (April 1970), Second (1972) Indicating instruments and electric clocks (1963) Amendments: 1 (October 1971), 2 August 1973), 3(May 1974) Generating stations and substations, lines for transmission and distribution (1963) Amendment 1 (August 1973)
7 8 9 10 11 12 13
14 15 16
85
Variability, examples of resistors, elements of electronic tubes, values and rectifiers (1964) Amendments: 1 (August 1966), 2 (December 1967), 3 (August 1973) Semiconductor devices, capacitors (Second edition, 1971 ) Architectural diagrams (1967) Telephony, telegraphy, and transducers (1968) Supplements: First (1969), B (April 1971 ) Aerials (antennas) and radio stations (1968) Supplement A (Nov 1969) Microwave technology (1968) First supplement (1971) Frequency spectrum diagrams (1968) Block symbols for transmission and miscellaneous applications (1969) Supplements: First (1971), Second (1972), C (April 1974) Telecommunication lines and accessories (1971) Supplement A (May 1974) Binary logic elements (1972) Ferrite Cores and magnetic storage matrices ( 1972)
APPENDIX C Revised or Deleted Symbols
Appendix C Revised or Deleted Symbols
Recommended Symbols in ANSI Y32.21975
Symbols Formerly in ANSI Y32.2-1970
Revised See item 2.6.4
2.6.3 Bifilar slow-wave structure Commonly tubes.
used
in
:::( II
*
traveling-wave
):= *See Note 2.6.1A
Deleted Alternate 8.5.1 Semiconductor diode; semiconductor rectifier diode; metallic rectifier
See item 8.5.1
OR
e Revised Alternate 8.5.2 Capacitive diode (varactor)
8
Style 2
See item 8.5.2 Style 2
Deleted Alternate 8.6.3 NPN transistor with transverse-biased base
C ' (Em W
See item 8.6.3
( 92)
lEQ
(81l
Revised 8.11 Solid-State Thyratron (replacement type) 8.11.1 Balanced
(AI
IGI@
See item 8.11.1
(KI)(K21
8.11.2 Unbalanced
(A)
IG,gr) (KI) (K2)
86
See item 8.11.2
APPENDIXC Reviseo or Deleted Symbols
APPENDIXD Revised or Deleted Symbols
Symbols Formerly in USAS Y32.2-1967
Modified
Appendix D Revised or Deleted Symbols
APPENDlXD Revised or Deleted Symbols
Recommended Symbols in ANSI Y32.21975, if Not Otherwise Specified
Recommended Symbols in ANSI Y32.21975, if Not Otherwise Specified
Symbols Formerly in USAS Y32.2-1967
Rev~ed
See item 1.7.2
1.7.2 Both ways
and EXpanded
4.21 Thermostat Ambient-temperature-operated device.
OR
See items 4.21 throuf 4.21.
Operates on rising temperature.
See Note 1.7.1A
4.21.1 With break contact See also item 4.20.2
See item 2.1.12
Expanded
--n,
2.1.12 Thermistor Thermal resistor f]
OR
~
2.1.12.1 General
4.21.2 With make contact See also item 4.20.2
---I"l!
2.1.12.2 With independent integral beater
OR
-rxJ 4.21.3 With integral heater and transfer contacts
oaw
~ Revised
See item 2.8
See item 4.30
Deleted
2.8 Pel'llUllleDt Magnet lJ 4.30 Relay
IEJ
B
I2C:J tFO Fast-operate ISC:J tFR Fast-release
Revised
See item 3.1.9
3.1.'* Couial cable. recognition ~ symbol Couial transmission path Radio-frequency cable !1 (coaxial)
See items 4.30.5 through 4.30.6
Revised and Expanded 4.30.5 Thermal relay B .J"L. OR....JL..-
NOTE 1.1.9A: U uecesaa:Y for c:luity. aD outer· coodUdal' CIDDDOCtioD to tho .ymbol. shall be JUde . . . . the bnIka liDo • - - fa UowD.
J
*' OR
OR
JXr-
~ See Note 3.1.9A
J
87
OR
JX.r
'*
APPENDIX D Revised or Deleted Symbols
APPENDIX D Revised or Deleted Symbols
Revised or Deleted Symbols
Symbols Formerly in US AS Y32.2-1967
Recommended Symbols in ANSI Y32.21975, if Not Otherwise Specified
Symbols Formerly in USAS Y32.2-1967
Revised 7.3.6 Cathode-ray tube 7.3.6.1 With electric-field deflection
See item 5.6.2
Revised
Recommended Symbols in ANSI Y32.21975, if Not Otherwise Specified
5.6.2 Coaxial with the outside conductor shown carried through
~
See items 7.3.6 through 7.3.6.2.2
'fAY
7.3.6.2 For magne.tic deflection See item 5.6.3
Revised
Q
5.6.3 Application: Coaxial with outside conductor shown carried through: with outside conductor terminated on chassis
'fAY
Revised 8.6.15 Thyristor. bidirectional triodetype; triac; gated switch Style 3
See item 5.6.4
Revised
See item 8.6.15
5.6.4 Application: Coaxial with center conductor shown carried through: outside conductor not carried through
Revised and Expanded
See item 9.1.3
9.1.2 High-voltage primary fuse cutout. dry OR
Revised
See item 5.7.1
5.7.1 Mated (general)
-~
See Note 5.7 A Revised and Expanded Deleted 5.7.4 Application: mated choke flanges in rectangular waveguide line
Revised
See item 5.7.4
See item 9.1.2
9.1.4 With alarm contact When fuse blows. alarm bus A is connected to power bus B. Letters are for explanation and are not part of the symbol.
See item 5.7.5
lEe
::.~
OR
5.7.5 Application: rectangular waveguide with mated plain and choke flanges with direct-current isolation (insulation) between sections of waveguide.
,~t1 A
8
OR
87 A...,
lOAD
88
APPENDIXD Revised or Deleted Symbols
Revi;;ed or Deleted Symbols
r Symbols Formerly in USAS Y32.2-1967
Revised
Recommended Symbols in ANSI Y32.21975, if Not Otherwise Specified
Symbols Formerly in USAS Y32.2-1967
See item 10.4.1
10.4.1 General
Revised 15.2.4 Coupling by loop from coaxial to circular waveguide with direct-curJ'8Dt groWld. c:o~
Revised 15.2.7 Coupling by probe from c0axial to rectangular waveguide with direct-current grounds connected
Revised 15.3.2 Application: E-plane aperture coupling, 30-decibel transmission loss
X0
APPENDlXD Revised or Deleted Symbols
Recommended Symbols in ANSI Y32.21975, if Not Otherwise Specified
Deleted 15.4.5.1 Application: circulator, reversible direction The polarity symbol (item 1.6) must be used with the electromagnet symbol to indicate proper direction flow.
See item 15.8.4.1
Revised 15.5.3 Application: transducer from rectangular waveguide to coaxial with mode suppression and direct-current grounds connected.
See item lS.S.3
Revised
See item lS.7.1.1
See item IS.2.4
See item IS.2.7
15.7.1.1 Application: coaxial type in rectangular waveguide system
See items IS.3.2 through IS.3.6
D18
15.3.3 Application: loop coupling, 30decibel transmission loss
Xrv:lOO
Deleted 15.8.3 Unidirectional (isolator) Power flowing in direction of arrow is not intentionally attenuated.
l
See item 15.8.1
15.3.4 Application: probe coupling, 3O-decibel transmission loss
xI
•
:1001
15.3.5 Application: resistance coupling, 3O-decibel transmission loss
Revised 15.4.4.1 Application: 5-arm circular hybrid with principal coupling in the E plane and with I-arm H coupling using rectangular waveguide
Revised 15.9.2 Application: resonator with mode suppression coupled by an Eplane aperture to a guided transmission path and by a loop to a coaxial path
See item IS.4.4
......
.c
®.
.
~
I
~
'c 'i"
89
See item lS.9.2
APPENDIX D Revised or Deleted Symbols
Revised or Deleted Symbols
Recommended Symbols in
Recommended Symbols in Symbols Formerly in US AS Y32.2-1967
Symbols Formerly in USAS Y32.2-1967
ANSI Y32.21975, if Not Otherwise
ANSI Y32.21975, if Not Otherwise Specified
Specified
See item 15.9.3
Revised
APPENDIX D Revised or Deleted Symbols
Revised
See item 15.14.2
15.14.2 Forward-wave travelingwave-tube amplifier shown with four grids. having slow-wave structure with attenuation. magnetic focusing by external permanent magnet. rf input and rf output coupling. each by inductive coupling
15.9.3 Application: tunable resonator having adjustable Q coupled by a probe to a coaxial system
See item
Revised
15.11.1 15.11.1 Resonant type with coaxial output Revised
Revised
See item 15.14.3
15.14.3 Forward-wave traveling· wave·tube amplifier shown with four grids. having slow-wave structure with attenuation. external electromagnetic focusing. rf input and rf output coupling-each by external cavity and loop coupling. to a coaxial path
See item 15.12.2
15.12.2 Double-cavity klystron. integral cavity. permanent externallyganged tuning. loop coupled (coupling loop may be shown inside if desired) See item 7.1.7.1.
Revised
See item 15.14.1
Revised
15.14.1 Forward-wave travelingwave-tube amplifier shown with four grids. having slow-wave structure with attenuation. magnetic focusing by external ,)ermanent magnet. rf input and rf output coupling. each by E-plane aperture to external rectangular waveguide
II
15.14.4 Forward-wave traveling· wave-tube amplifier shown with four grids. having slow-wave structure with attenuation. magnetic focusing by external permanent magnet. rf input and rf output coupling, each by direct connection from slow-wave structure to a coaxial path
;
90
See item 15.14.4
APPENDIXD Revised or Deleted Symbols
Symbols Formerly in USAS Y32.2-1967
Revised
Revised or Deleted Symbols
APPENDIXD Revised or Deleted Symbols
Recommended Symbols in ANSI Y32.21975, if Not Otherwise Specified
Recommended Symbols in ANSI Y32.21975, if Not Otherwise Specified
Symbols Formerly in USAS Y32.2-1967
See item 15.14.6
Deleted
15.14.6 Backward-wave travelingwave-tube amplifier shown with two grids. having slow-wave structure with attenuation. sole (beam-aligning electrode). magnetic focusing by extemal permanent magnet. rf input and rf output coupling. each by E-plane aperture to extemal rectangular waveguide
16.1.1.3 Additional letter combinations. as follows, may be employed, but the use of specific graphic symbols included elsewhere in this standard is preferred
AR AT C CB HS I L J LS MIC OSC PAD P HT
See item 15.14.7
Revised 15.14.7 Backward-wave travelingwave-tube oscillator shown with two grids. having slow-wave structure with attenuation. sole (beam-aligning electrode). magnetic: focusing by external permanent magnet. rf output coupling by inductive coupling
K
R S T WR
...
~ ...
..
I
(""'1
See item 15.14.8
Revised 15.14.8 Backward-wave travelingwave-tube oscillator shown with two grids. having slow-wave structure with attenuation. sole (beam-aligning electrode). magnetic focusing by extemal permanent magnet, rf output coupling by inductive coupling, with slow-wave structure connected internally to collector
" ' m .. II
See item 16.1.1
I
(""'1
91
Amplifier fI Attenuator Capacitor II Circuit breaker !J Handset f] Indicating or switchboard lamp Inductor Jac:k Loudspeaker E Microphone !1 Oscillator Pad Plug Receiver, headset Relay lJ Resistor !J Switch !J or key switch Transformer II Wall receptacle
Symbols Fonnerly in USA Standard Y32.2-1962 & Supp lement Y32.2A.1964 0 ' MI L·STD-15· I A ( including original item numbers ) Oeleteo 11.3.1 On a con nection
wiring dingram. a 3-pole s ingle-thro ..... ci rcuit breaker 0'
Recommended Symbols in ANSI Y32.2 · 1975 . if Not
Symbols Forme rl y in USA Standa,d Y32 .2·1962 & Supplement Y32.2a- I 964 or MI L-STD-15·IA ( including orig.inal item n umbers )
Otherw ise Specified
Corrected 58.8.4 Shielded 2·conductor cable with n shield grounded
Sec ANS I
YI4 .15· 1966
D 00
Corrected 71.2 . 1 Reson ator with mode .suppress ion coupled by an E-plan e aperture to a guided transmission path and by a loop to a co· axial path .
See Note 11 .3A
FOR CONNECTION OR WIRING DIAGRAM
See item 3.1.8.4
Sec item 15.9.2
Sec it.,'m 15.12.2
~~&t ,
Revised ar,d Expanded 42.7 Saturable -co re indunor I reacto r I Polarity marks may be added to direct ·
ANSI Y32.2· 1975. if Not Otherwise Specified
r
0
Corrected 34. I 1.10.2 Double-cavity klyst ron. integr nl cavity. permanent externa l-ganged tuning, loop coupled (coupling loop may be shown in side if desired I See item 34 .S. 1.
Recommended Symbols in
I I
(with terminals s h o wn ) may be drawn as sho wn below
,
APPENDIX E Revised or Deleted Symbols
Appendix E Revised or Deleted Symbols
APPENDIX E Revised or Delete d Symbols
Sec item 6.3
c urrent winding . Exp lanatory word s and a rro ..... a,e not part of the sy mbol s ho ..... n. DC WINDING
Revised 76 . 12.7 Wafer. 3·pole 3·circuit with 2 non shorting and 1 shorting moving contacts Viewed from e nd opposite control knob or actuator unless othen,.. ise indicated . For m o re than one section. section No . 1 is nearest control knob . Whe n contacts are on both sides, front conta cts are nea rest control knob.
See item 4.13.7
Deleted
Sec Ai'\SI
8 1.5 Applications
YI4 . IS· 1966
~r Revised
S,'(' item 12.1
48 Meter I nstrument T Tempe rature meter Corrected
Sec it('m 15.5.3
NOTE 8 1.5A : If the device terminal a lIll"e in a circular arrllnKement . t he actual anKular apacing between the terminals s hould be app rOJli mated on the terminlll d it.gram. NOTE 81.58 : If the te rm inlil. lire in an eeeentially linear errllnKement the terminal diagTam may ehow lhe terminals in eilher 1\ linear array .long one .ide of lhe elonsued e nve lope ey mbol tprefer able). or wit hin a maJl imum .ngle of 150 dellTM • .round the circular envelope sy mbol. NOTE 81.5C : If pin .. lite omitted in an o therwiee .. tandard term inal arrangemen t , d o not .Teap.ce the remaininll" pine. NOTE 81.50 : A terminal .t the center of the termi· nal arrangemenl .. hall be identified ae the CENTER terminal lead or pin. NOTE 81.5E : The typical eJlampiu show pin num· berinK in accorda nce with standard indultry practice. i.e . . with t he terminals viewed from outeide the ter· minal f. ce of the device.
53.3 Appli catio n : transducer fr om rectang ular waveguide to coaxial with m ode s up · pression and direct·current grounds co n · nect.ed
~ C:6
7
\
Correct('d
58.8.2 Coaxial cable, recog niti on symCoaxial t ra n smission path Cable. radio frequ e ncy II · ICoaxiall See item 58 _1.
Sec item 3. 1.9
0: 92
APPENDIX E
Revised or Deleted Symbols
Revised oC Deleted Symbols
Symbols Fonner)' in USA Standard Y32.2.1962 6: Supplement Y32.28-1964 or MIL-STD-I5-1A (including original item numbers)
Deleted (Continued) 81.5.1 Two·terminal device with one flexible lead and one rigid terminal con· nected to a metallic envelope (typical semiconductor diode shown I.
Recommended Symbols in ANSI Y32.21975, if Not Otherwise Specified
Symbols Fonnerly in USA Standard Y32.2-1962 6: Supplement Y32.2a-1964 or MIL-STD-I5-1A (including original item numbers) Deleted (Continued)
See ANSI YI4.IS1966
81.5.7 Device with 8-terminal keyt:d (such as octal) base, rigid envelope terminal, and metallic envelope connected to base terminal (typical triode-heptode shown).
o--@
e 4
81.5.2 Two-terminal device with rigid terminals and reference point located at one of the terminals (typical semiconductor diode shown I.
APPENDIXE Revised or Deleted Symbols
Recommended Symbols in ANSI Y32.21975, if Not Otherwise Specified See ANSI YI4.IS1966
81.5.8 Device with keyed (such as octal) base having design capability of 8 pins but with 2 pins omitted, and with 3 rigid envelope terminal~ (typical disc-seal triode shown).
81.5.3 Three-terminal device with circular arrangement of pin terminals with base orientation determined by gap in pin spacing !typical transistor shown I. 81.5.9 Device with 9-terminal (such as noval) base utilizing gap in pin spacing to ":l'itablish base orientation (typical twin t.riode shown).
81.5.4 Three-terminal device with rigid termi nals. one connected to the metallic enclosure. and index pin (typical ~ shown I.
W
Revised
coo> o
84 Thermistor Resistor, Thermal El lOT" indicates that the primary characteristic of the element within the circle is a function of temperature.
81.5.5 Four-terminal device with in-line pin terminals. one connected to metallic envelope. and reference point (typical transistor shownl.
Revised
See items 1. 2.1
and 2.1.12
See item 2.1.12.1
84.1 General
Revised
See item B.B.I
85.2.1 Temperature-measuring semiconductor thermocouple ~
81.5.6 F:"e-terminal device with in-line terminal leads. one connected to metallic enclosure and reference point (typical relay shown).
Corrected 86.1.1 Application: transformer with direct-current connections and mode suppression between two rectangular waveguides
93
See item 6.4.1.1
APPENDIX F Cross Reference List of Class Designation Letters
Appendix F Cross-Reference List of Class Designation Letters
APPENDIX F Cross-Reference List of Class Designation Letters
IEC Publication 113-2 (1971) Item Designations, Letter Codes ANSI Y32.2-1975 (IEEE Std 315-1975), Section 22, Class Designation Letters
*
No conflict between ANSI Y32.2 and IEC. ANSI Y32.2 not in agreement with IEC, but no conflict if used. ANSI Y32.2 conflicts with IEC as IEC uses class letter to represent other devices.
# @
IEC Publication 113-2 Terminology #
* @
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* # * * * * @
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#
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* * * # * # * * # # #
* #
Acoustical indicator ........... H Adjustable resistor ............. R Aerial ................ W Amplifier ..... o.............. A Amplifier (with tubes) .... A Arrester ..................... F Assemblies _.............. A Auxiliary switch S Battery .G Bistable element .. .D Brake .. o ...... o.o.Y Busbar oW Cable ....... o ........ o ... o.. W Cable balancing network .... oZ Capacitor .C Changer o. o.. U Circuit breaker oQ Clutch Y Coder ...... o. oU Compander .. Z Connecting stage S Contactors .. K Control switch S Converter .. U Core, storage .. D Crystal filter o. oZ Crystal transducer .... B Current transformer .... o ......T Delay device .. D Delay line ...... D Demodulator .. U Dial contact .S Diode oV Dipole oW Disconnecting plug .. X Disconnecting socket ........... X Discriminator .. U Disk recorder .. .D Dynamotor ... B Electrically operated mechanical o. Y device .... Electronic tube ..... V Equalizer. Z Filter ........ Z Frequency changer ...... U Fuse of Gas discharge tube ... V Generator .. o......... G Heating device ............ oE Hybrid ... o ... Z Indicating device ........ P Induction coil ........ L Inductors ......... L Integrating measuring device oP Inverter U Isolator ........ Q Jumper wire ............. oW Laser .... o.oo ............... A 0
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Letter Code IEC Y32.2
IEC Publication 113-2 Terminology
Letter Code IEC Y32.2 LS R
*
E
#
AR AR
@
#
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# #
A,U
#
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BT U,A MP
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94
Lighting device .. oE Limit switch ... S Limiter ....... Z Line trap ............ L Loudspeaker .. B Magnetic amplifier A Magnetic tape recorder oD Maser o. o.. A Measuring equipment o......... P Microphone ..•......... .B Miscellaneous ..•. E Modulator .............. U Monostable element ..... D Motor ...... : ... o ........•. M Optical indicator .•.. H Oscillator ....................G Overvoltage discharge device ..... F Parabolic aerial .. W Photoelectric cell B Pickup o ...... B Plug ..... oX Pneumatic valve •. Y Potentiometer ................ R Power switchgear. o. Q Protective device .. F Pushbutton ........ S Quartz-oscillator ....... G Recording device . P Register .D Relay ...... o............ K Resistor. R Resolver ............... B Rheostat ... R Rotating frequency generator. G Rotating generator ............G Selector. S Selector switch ............... S Semiconductor ............ V Shunt(resistor) R Signal generator. oP Signaling device. oH Socket o........... oX Soldering terminal strip .X Static frequency changer U Storage device ....... oD Subassembly . oA Supply ................. ooo.G Supply device 0 Synchro B Telegraph translator ... U Terminal ........ .X Terminal board ...... oX Termination . Z Test jack . X Testing equipment .... P Thermistor ......... R Thermo cell ......... B Thermoelectric sensor .......... B 0
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MT,RE FL,MP,V LS AR A A
M
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PU P
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Y A,M A,U,M K R B R
G,MO G
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E,TB A A,U A
A,PS A,PS B
A E
TB AT E,J A
RT A,TC A
APPENDIX F Cross-Reference List of Class Designation Letters
IEC Publication 113-2 Terminology # #
* * @ * * * #
Cross-Reference List of Class Designation Letters Letter Code IEC Y32.2
Thyristor .................... V Transducer (nonelectrical quantity to electrical quantity) .................. B Transfonner .................T Transmission path .............W Transistor ................... V Tube (electron) ............... V Voltage transformer (potential) ... T Waveguide ...................W Waveguide directional coupler .... W
Q
A,BT T W Q
V T W DC
95
APPENDIX F Cross Reference List of Class Designation Letters
Absorber, voltage Block
Absorber, voltage Block
Index NOTE: This index contains commonly accepted or standard item names as used in the list of symbols, as well as some colloquial names. Certain of these names may not appear under the item listing.
Name
r'
Absorber, overvoltage AO (see alternating-current) Accelerometer Active space-station Actuating device, thermal Acyclic generator Adapter, connector Adjustability, extrinsic General Linear Nonlinear Preset Adjustable Contact Gain amplifier In steps Inductance Nonlinear variability Phase shifter Resistor Transformer Aerial Air (recognition symbol) Air circuit breaker Air core Air path Air transmission path Alarm Audible Contact Visual Alligator clip AI ternate wiring AI ternating-curren t Generator Machine DC field Motor Source Alternating- and direct-current composite machines Alternating current telegraph repeater Ambient-temperature - operated device Ammeter Ampere-hour meter Ampli.dyne Amplifier Operational Rotating Summing Amplifier-type telephone set Analog functions Aneroid capsule operated switch Angular velocity dependence Annunciator Anode Electron tube Target X-ray tube Antenna Antenna-counterpoise Aperture coupling
Item Number
Letter
8.5.6
D,VR
2.11 20.2.2 2.14 13.4.19 5.6.5 1.1.1 1.1.1.1 1.1.1.3 1.1.1.4 1.1.1.2
A,MT
4.2.2.1 16.2.5 1.1.3.2 6.2.4 1.1.1.4 16.6.3 2.1.3 6.4.9 2.3 1.4.1 9.4.2 6.1.1 3.1.3 3.1.3
Class
Name Applications Semiconductor Transistor Armature (commutator and brushes) Arrester Electric surge Lightning Arrow (adjustable) Associated Path Equipment
G CP
E AR
Asymmetrical waveguide connectors Attenuator Fixed Variable Audible-signaling devices Audio Amplifier Level meter Meter Automatic switching Automatic transmitter Autotransformer Load ratio control Avalanche diode Backward diode Backward -wave traveling-wave tube Balance (relay protective function) Balanced attenuator Variable Balanced current relay Balanced stripline Balancer, dc Ball-type annunciator Ballast, lamp Ballast lamp or tube Balun Band elimination filter Bandpass filter Frequency Barrier photocell Base-orientation device Base pin terminals Basic contact assemblies Battery Bead ring, ferrite Bell Bidirectional photodiode (photosensitive type) Two segment, with common cathode lead Four quadrant, with common cathode lead Bifilar slow-wave structure Bimetallic strip Binding post Bipolar voltage limiter Block Carbon Connecting
L Z R T E
CB
10.1 9.1.2 11.2 5.3.1 3.3
LS F DS E
13.1.2.2 13.5 13.6 13.1.3.2 2.7
G B,G B,G B
13.7
MG
20.4.4.3 4.21 12.1 12.1 13.4.20-23 17.1 13.4.20 17.2 20.6.10 17.1 4.33 14.2.6 11.2.1 7.1.3.1 7.1.3.2 7.1.3.2 2.3 2.3.4 15.2.1
S M M G
AR G
AR A S DS
E E CP
97
Item Number
Class
Letter
8.5 8.6 13.1.5
E
9.3 9.3 1.1
E E
3.4 A4.10 3.4
W
5.7.2 2.4 2.4.1 2.4.4 10.1
J.p
16.2 12.1 12.1 20.3.2 20.5.7.8 6.4.8 6.4.10.2 8.5.6.1 8.5.7.2
AR M M
15.14.6-8
V
9.5.5 2.4.2 2.4.5 9.5.12.6 3.7.2 13.4.15,16 11.2.3 6.2 11.1.5 15.15 16.1.1.2 16.1.1.2 15.16.2 8.7.3 5.1.2.3 5.1.2.1 4.3 2.5 15.18 10.1.1
AT AT AT LS
T T D,VR D,CR
AT AT K W
G DS L RT Z FL FL FL BT E BT E LS
8.5.4.3
D,CR
8.5.4.4
D,CR
8.5.4.5 2.6.4 2.14 5.1.1 8.5.6.2
D,CR DL
9.3.2 6.1.1.1
E D,VR E
'DB
Blocking layer cell Coaxial
Blocking layer cell Coaxial
Index Name
Telephone protector Test Blocking layer cell Blowout coil Board, terminal Bolometer Booster amplifier Brake Break contact Break swi tch Locking Nonlocking Pushbutton Breakdown diode Bidirectional Unidirectional Breakdown indicator Breaker (see circuit breaker) Bridge rectifier Bridging amplifier Brush-shifting motor Brushes Buchholz relay (relay protective function Bus bar Bushing, capacitor Buzzer Cable Coaxial Shielded Multiple Single Termination Underground Cable assembly Cable end, not connected Cable gland Cable underground Cam-operated master switch Capacitive Diode Special property indicator Termination Capacitor Bushing Coupling Differential Electrolytic Feed-through Fixed Phase shifter Polarized Potential device Shielded Shunt Split stator Terminating Variable Carbon block Carrier-coupling capacitor Carrier current (relay protective function) Carrier-line trap Carrier pilot (relay protective function)
Item Number 9.3.2 5.5 8.7.3 4.4 5.1.1.1 2.1.11.3 16.2.1 14.3 4.3.1
Class Letter
Name
E TB BT L TB AT AR
Cathode Cold Directly heated Electron tube Indirectly heated Ionically heated Photo Pool Tapped Cathode ray tube Cavity, tuned Cavity resonator Cell Aluminum (Arrester) Battery Blocking-Layer (Photosensitive) Conductivity Electrolytic (Arrester) Photosensitive Photoconductive Assymmetrical Symmetrical
MP S
4.10.2 4.9.2 4.7.2
S S S
8.5.6.2 8.5.6.4 8.5.6.1 8.5.6.3 8.3.1
D,VR D,VR D,VR D,VR
16.3.3 16.2.1 13.5.11-13 13.1.5
D,CR AR B E
9.5.12.19 3.1.1.1 2.2.14 10.1.2
W C LS
3.1 3.1.9
W W
3.1.8.3 3.1.8.1 5.2 3.2.2 3.1.1 3.1.12 3.10 3.2.2 4.13.10
W W E W W E E W S
8.5.2 8.3.4 2.2.10 2.2 2.2.14 2.2.12 2.2.6 2.2.2 2.2.12 2.2.1 2.2.7 2.2.2 2.2.15-16 2.2.3 2.2.9 2.2.8 2.2.10 2.2.4 9.3.2 2.2.15
D,CR AT C C C C C C C C C A,U C C C C C E C
9.5.8 6.2.8
Z
Photovoltaic Solar Chassis Chassis connection Choke coil Choke waveguide flanges Chopper Circuit Breaker Air Magnetic Thermal Element (general) Open Return Short Terminal Circuit-closing switch Locking Nonlocking Pushbutton Circuit-opening switch Nonlocking Pushbutton Circular Hybrid Waveguide Waveguide rotary joint Circulator Fixed direction Reversible direction Clean earth Clip Alligator Test Clock Contact making Clockwise rotation Clutch Coaxial Cable Connector Resonator Rotary joint Waveguide Structure not maintained
9.5.12.16
98
Item Number 7.1.1.3 7.1.1.1 7.1.1 7.1.1.2 7.1.1.6 7.1.1.4 7.1.1.5 7.2.3 7.3.6 15.9 15.10 9.3.3 2.5 8.7.3 7.6 9.3.3 8.7.1 8.7.2 2.1.13 8.7.3 8.7.3 3.9.2 3.9.2 6.2 5.7.4 16.7 9.4 9.4.2 9.4.6 9.4.5 16.1.1 3.8.1 3.9 3.8.2 5.1.1
Class Letter
~
V Z
V E BT BT E E CR,D
R R BT BT L J,P G
CB CB CB CB
~
AT AT E
4.10.1 4.9.1 4.7.1
S S S
4.9.2 4.7.2
S S
15.4.4 3.6.1 15.7.1.2
HY W E
15.8.4 15.8.4.1 3.9.1.1
HY
HY
5.3.1 5.3.1 12.1 12.1 14.2.5 14.3
E E M M
3.1.9 5.6 15.9.1 15.7.1.1 3.0.3 3.1.9.1
W J,P
MP
Z
E W
~
Coil Current
Name
~
Coil (see also inductor) Choke Loading Magnetic blowout Multiwinding Operating Relay Repeating Retardation Coil operated flag indicator Cold cathode Lamp Tube Collecting and emitting electrode Alternately collecting and emitting Dynode Collecting electrode Anode Collector Fluorescent target Plate Target X-ray anode Collector (semiconductor device) Plurality of Single Combination locking and nonlocking switch Common-battery telephone set Common connections Communication switchboardtype Connector Lamp Commutating field Commutator Compensating field Composite machines Compound generator Compound motor
~
Coil Current
Index
Compression amplifier Condenser, synchronous Conditional wiring Conductance (VHH, VHF, SHF) Conductive path Conductivity cell Conductor Assembled Associated Junction Hermaphroditic Not connected Shielded Underground Cable Conductor junction Connection Chassis Common Frame Mechanical Connector Asymmetrical (waveguide) Communication switchboard type
Item Number 6.2 6.2 4.4 4.5.2 4.5 4.5 6.4 6.2 6.2.9 7.1.1.3 11.1.3 7.3.4
Class Letter
Name Disconnecting device Symmetrical (waveguide) Waveguide Connector adapter Connector, coaxial Constant-current transformer Contact Bridging Electrical Fixed Locking Moving Nonlocking Rotating Split Reed Vibrator Reed Contact assembly, basic Contact make-break ammeter Contact make-break voltmeter Contactor Continuous loop fire detector Continuously adjustable Inductor, inductance Resistor Control-differen tial transmitter, synchro Control transformer, synchro Control transmitter, synchro Controlled rectifier N-type P-type Controlling electrode Beam-confining or beam-forming Deflecting Excitor Grid Ignitor Reflecting or repelling Controlling radio station Convenience outlets Converter, motor Core Air Magnet Magnetic Magnetic memory Coulomb accumulator Counter, electromagnetically operated Counterpoise, antenna Coupled tunable resonator Coupler Directional RF rotary Coupling Coupling capacitor Crossing of paths Crystal diode Crystal rectifier Crystal uni t Current Limiter Kind (qualifying symbols) Measuring thermocouple Dissimilar metals Semiconductor Regulator diode
L L L L L L L L L DS V
7.1.4 7.1.4.2 7.1.4.1 7.1.3 7.1.3.1 7.1.3.1 7.1.3.1 7.1.3.1 7.1.3.2 7.1.3.2 8.2.5.1 8.2.5 4.11 20.6.3 3.9.3
S A
5.3.5 11.2.6 13.2.1 13.1.5 13.2.1 13.7 13.4.13 13.4.14 13.4.9 13.4.10 16.2.1 13.6.1-4 3.3 15.1.3.3 3.1.2 7.6 3.1 3.1.8 3.1.7 3.1.6.4 3.1.6.5 3.1.12 3.1.8.1 3.2.2 3.1.6.5
J,P DB L
3.9.2 3.9.3 3.9.2 14.1 5.3 5.7.2 5.3.5
L MG G G B B AR G
W Z W E W W W
J,P E W W J, P
J,P,X J,P J,P
99
Item Number
Class Letter
5.3 5.7.1 5.7 5.6.5 5.6 6.4.6
J,P J,P J,P CP J,P T
4.2.2.4 4.2 4.2.1 4.2.2.2 4.2.2 4.2.2.3 4.2.2.7 4.2.2.6 4.2.2.5 4.3 12.1 12.1 4.29 2.16 1.1.3.1 6.2.5 2.1.4
E E E E E E E E E S M M K,S E
13.8 13.8 13.8 16.3.2 8.6.12.1 8.6.13.1 7.1.2
B B B PS Q Q
L R
7.1.2.1 7.1.2.2 7.1.2.4 7.1.2.1 7.1.2.3 7.1.2.2 20.1.6 5.4 13.7.5 6.1 6.1.1 6.1.3 6.1.2 6.1.4 7.5
J MG
12.2 2.3.4 15.9.2-4
M E Z
15.3 15.7 15.2 2.2.11 3.1.5 8.5.1 8.5.1 2.10
DC E
E E E M
CP
C CR,D CR,D Y
9.2 1.8
F
2.13.2 8.8.2 8.5.11
TC TC CR,D
Cutout, primary fuse E·pJane coupling
Name Transformer Polarity markings Cutout, primary fuse Dry Oil Cutout, thermal Element Flasher Darlington transistor Dashpot, relay Data flow code signals DB meter DBM meter DC (see direct-current) DC to dc rotary converter With common permanent magnet field With common field winding Decibel meter Deflecting electrode Delay Delay function Delay line Del ta connection Delta winding Demand meter Demand totalizing relay meter Demodulator, diode-type ring Detector Continuous loop fire Crystal Primary Device Actuating, thermal Audible signaling Disconnecting Outdoor metering Semiconductor Visual signaling Diac, trigger Dial, switch, telephone Dial telephone Dial-type telephone set Diametrical winding Dielectric-filled metallic waveguide Dielectric path Differential Capacitor Current relay Phase-shifter Receiver (synchro) Relay Relay protective function Transmitter Digital logic functions Diode Avalanche Backward Breakdown Bidirectional Unidirectional Capacitive Crystal
Cu tout, primary fuse E-plane coupling
Index Item Number
Class Letter
6.4.18 1.6.3.1
T
9.1.2 9.1.3 4.20 2.14 4.22
F F S HR S
8.6.17 4.30 19.1 12.1 12.1
Q K
13.4.24 13.4.25 12.1 7.1.2.2 1.2.5 2.6 1.2.5 2.6 1.9.3 13.3.5 12.1 12.1 16.8
MG MG M
Name Light emitting Photo Emissive type Sensitive type Bidirectional (photosensitive type) PIN-type Rectifier (semiconductor) Reverse blocking Semiconductor Step-recovery Storage Temperature dependent Tunnel Voltage regulator Diode-type ring demodulator Diode-type ring modulator Dipole antenna Direct current Amplifier Generator Isolation, intentional Machines Generator Motor Motor Source Direction-finding ratio station Direction of flow of power, signals, or information Directional coupler Directional distance (relay protective function) Directional overcurrent (relay protective function) Directional residual overcurrent (relay protective function) Directly heated cathode Disconnecting device Disconnecting fuse-switch
M M
DL DL M M D,CR
2.16 8.5.1 2.11
E D,CR MT
2.14 10.1 5.3 6.4.21 8.1 11.2 8.5.6.3 4.25.2 16.1.1.2 20.6.4 13.3.6
HR LS J,P,X T DS D,CR S S A
3.6.2.1 3.1.4
W W
2.2.6 9.5.12.7 16.6.4 13.8.3 4.30 9.5.6 13.8.3 18.1
C K Z B K B
8.5.6.1 8.5.7.2
D.VR D,CR
8.5.6.2 8.5.6.4 8.5.6.1 8.5.6.3 8.5.2 8.5.1
D,CR D,CR D,CR D,CR D,CR D,CR
100
Item Number 8.5.4.2 8.5.4 8.5.4.2 8.5.4.1
Class Letter
D,CR D,CR
8.5.4.3 8.5.12 8.5.1 8.5.8 8.5.1 8.5.9 8.5.5 8.5.3 8.5.7.1 8.5.6.1 16.8 16.8 2.3.2
D,CR D,CR D,CR D,CR D,CR D,CR D,CR D,CR D,CR VR D,CR D,CR E
16.2.1 13.1.2.1 3.5 13.4 13.4.1-23 13.4.1-10 13.1.3.1 2.5.1 20.1.4
AR G
1.7 15.3
B,G G B B BT
DC
9.5.12.9
~
9.5.4 9.5.12.3 7.1.1.1 5.3 9.1.3 9.1.5 4.6 15.1
J,P,X S S S Z
9.5.12.8 3.2 17.5
A
Disconnecting switch Discontinuity Distance (protective relay function) Distribution line Divider, electronic Double Based diode N-type P-type Headset Zig-zag connection Double-biased relay Double-current (telegraph repeater) Double-current generator Double-delta connection Double-delta winding Double-throw switch Drop (annunciator) Drum switch Duplex (telegraph) Duplex telegraph repeater Dynamotor
20.4.4.1 13.4.18 1.9.11 13.3.7 4.6.2 11.2.2-8 4.13.11 20.5.5 20.4.3 13.4.17
MG
E-H tuner E-plane coupling
15.1.5 15.2.1
Z CP
8.6.8 8.6.9 10.4.2 1.9.14 4.30
~
DS
Q Q NT K
G S DS S
~
Earphone Four-wire two-way repeater
r
Name Earphone Earth (see ground) Earth-station (satellite communication) Elapsed time meter Electret Electret material Electric bell Electric hom Electrical contact Electrically polarized relay Electrically restored drop Electrochemical step-function device Electrochemical time-dependence cell Electrode Anode Cathode Collecting Collecting and emitting Controlling Deflecting Emitting Exitor Grid Heater Ignitor Electrolytic capacitor Electrolytic cell Electromagnetic radiation Dependence Emitting Sensitivity Electromagnetically operated counter Electron tube Applications Heater Notes Terminals Electronic divider Electronic flash tube Electronic function generator Electronic multiplier Element Circuit (General) Fillt) (arrester) Fuse Fusible Hall Thermal Emitter Emitting electrode Cold cathode Directly heated cathode Indirectly heated cathode Ionically heated cathode Photocathode Pool cathode Enclosure Envelope Connections Terminals Epitaxial transistor PNP-type NPN-type Equalizer Equivalent chassis connection
Earphone Four-wire two-way repeater
Index Item Number 10.4 20.2.4 12.1 1.14 1.4.5 10.1.1 10.1.3 4.2 4.30 11.2.5
Class
Letter
Erasing head Esaki diode Evacuated switch Exchange equipment Excitor electrode Expansion amplifier Explosive squib External shield1 X-ray Extinguisher, fire (actuating head) Extrinsic adjustability
HT
M E
LS LS E K DS
7.5
M
7.5
M
7.1.3 7.1.1 7.1.3 7.1.4 7.1.2 7.1.2.2 7.1.1 7.1.2.4 7.1.2.1 7.1.5 7.1.2.3 2.2.2 9.3.3
Name
Facsimile (telegraph) Qualifying symbol Receiver Facsimile set Fast operate relay Fast release relay Fault signal code Feed-through capacitor Feedback amplifier Female nonpolarized connector Female polarized connector Ferrite bead ring Field Commutating Compensating Generator or motor Permanent magnet Separately excited Series Shunt Field-effect transistor N-type P-type Field polarization amplitude modulator Field polarization rotator Field winding Filament, electron tube Film element, arrester Filter Band elimination Bandpass Frequency High pass Low pass Mode Fire detector, continuous loop Fire extinguisher (actuating head) Five conductor cable Fixed capacitor Fixed contact Fixed direction circulator Flag indicator, coil operated Flanges, waveguide Flash tube, electronic Flasher (circuit interrupter) Flexible waveguide Flow Flow-actuated switch Fluorescent lamp Foot operated switch Forward-wave traveling-wave tube Four layer diode Four-position switch Four-wire two-way repeater
C E
1.3 1.3 1.3 12.2 7.1 7.3 7.1.5 7.2 5.1.2 17.5 11.1.6 17.6 17.4 16.1.1 9.3.7 9.1 9.1 8.9 2.14 8.2.4 7.1.1 7.1.1.3 7.1.1.1 7.1.1.2 7.1.1.6 7.1.1.4 7.1.1.5 1.10 1.10 5.1.2 5.1.2.2 8.6.1 8.6.2 16.1.1.2 3.9.2
M V V E A DS A A E F F E
E E Q Q EQ
101
Item Number
Class
Letter
2.9.4 8.5.7.1 4.25.3 20.3 7.1.2.4 16.2.1 2.12.1 7.1.6.2
PU D,CR S
16.12 1.1
E
AR SQ E
20.5.6.6 20.5.7.6 16.1.1.2 4.30 4.30 19.1.3 2.2.12 16.2.8 5.4.4 5.4.5 15.18
C AR J,P J,P E
13.2.1 13.2.1 13.2 13.2.4 13.2.3 13.2.2 13.2.3
L L L E L L L
8.6.10.1 8.6.11.1 15.8.6 15.8.5 13.2 7.1.5 9.3.7 16.1.1.2 16.1.1.2 16.1.1.2 15.16.2 16.1.1.2 16.1.1.2 15.16.1 2.16 16.12 3.1.8.6 2.2.1 4.2.1 15.8.4 6.2.9 5.7 11.1.6 4.22 3.6.4 1.7 4.17 11.1.2 4.23 15.14.1-5 8.5.8 4.3.8.3 16.4.4
A K K
Q Q A,U A,U L E FL FL FL FL FL FL FL E E W C E HY L J,P DS S W S DS S
V D,CR S AR
Frame connection Inertia switch
Frame connection Inertia switch
Index Name
Frame connection Frequency converter, induction Frequency filter Frequency meter Full-wave rectifier, bridge Function potentiometer Functional flow path Functional symbols Amplifier circuit Composite circuit Digital logic elements Linear element Relay contacts Relay or operating coil Signal generator Switch Switching Fuse Fusible element Fusible link Future Equipment Path Galvanometer Gap Horn Protective Sphere Gas (recognition symbol) Gas-filled tube envelope Gas-filled waveguide Gas pressure (relay protective function) Gaseous liquid (recognition symbol) Gate (control electrode) Geiger-Muller counter tube Generalized ac source Generalized integrator Generating station Generator (rotating machinery) Acyclic Alternating current Amplidyne Compound (dc) Compound (dc-3 wire) Direct current Double current Field Hand Magnetoelectric Regulating Synchronous Winding connection symbols Generator, electronic function Gland, cable Glow lamp Goubau line Governor Grid electrode Grid-type annunciator Ground Low-noise
Item Number
Class Letter
3.9.2 13.5.2 15.16.2 12.1 16.3.3 17.9 19.1.1
G Z M D,CR R
19.2.1 19.2.8 19.2.7 19.2.3 19.2.4 19.2.5 19.2.2 19.2.6 4.1 9.1 9.1 2.1.2.3
F F SQ
A4.10 3.4 3.4
W
12.1 9.3 9.3.4 9.3.5 9.3.6 1.4.1 1.10.3 3.6.2.3
M E E E E
W
9.5.12.19 1.4.4 8.2.9 7.5 2.7 17.7 ·21.1 13.4.19 13.1.2.2 13.5-6 13.4.20.23 13.4.9-10 13.4.13-14 13.1.2.1 13.4 13.4.18 13.2 13.1.6 13.5.10 13.4.20-23 13.1.2.3 13.6.1 13.3 17.6 3.10 11.1.3 3.6.7 4.27 7.1.2.1 11.2.2 3.9.1 3.9.1.1
Item Number
Class Letter
Noiseless Protective Relay, protective function Safety Ground detector Grouping of leads Guided path Gyrator Gyro Gyrocompass Gyroscope
3.9.1.1 3.9.1.2 9.5.10 3.9.1.2 12.1 3.1.10 3.1.1 15.8.3 16.9 16.9 16.9
W Z A A A
H-plane coupling Half-wave antenna Half-wave rectifier (diode) Hall element Hall generator Hand generator Handset Head Erasing Playback Recorder Reproducer Stereo Headset Double Single Hearing aid receiver Heater, electron tube Heating lamp Heating resistor Hermaphroditic connection High-pass filter Hook switch Hom Horn gap Howler Hybrid Circular Junction Hydroelectric generating station Hydrophone Hysteresis motor
15.2.1 2.3 8.5.1 8.9 8.9 13.1.5 10.3 2.9 2.9.4 2.9.3 2.9.2 2.9.3 2.9.6
CP E D,CR E E G HS PU PU PU PU PU PU
10.4.2 10.4.3 10.4 7.1.5 11.1.1 2.1.8 3.1.6.5 16.1.1.2 4.25.1 10.1.3 9.3.4 10.1.3.2 15.4 15.4.4 15.4.2
HT HT HT
21.2 10.1.3 13.5.7
MK
Ignitor electrode Ignitor plug Ignitor squib Dluminating lamp Incandescent lamp Indicating, pilot, signaling or switchboard light Indicating meter Indicator, coil operated flag Indirectly heated cathode Induction generator Induction motor Induction voltage regulator Inductive reactance Inductive susceptance Inductive termination Inductor Saturable-core Shunt Tapped Inertia switch
7.1.2.3 2.17 2.12.2 11.1.4 11.1.4
E SQ DS DS
Name
V A G G G G G G G G G L G G G G G A E DS W S DS
102
11.2.7 12.1 6.2.9 7.1.1.2 13.5.1 13.5.1 6.4.12-14 15.1.2.2 15.1.2.3 6.2.7 6.2 6.3 6.2.6 6.2.6 4.31
HR HR J,P FL S LS E LS HY HY HY
~
~
B
DS M L G B
VR Z Z AT L L L L S
~
Inherent variability Magnetic
"
r'
Inherent variabliJity Magnetic
Index Name
Item Number
Inherent variability Linear Nonlinear Instrument, meter Instrument shunt Insulated gate Integral heater, thermocouple Integrating meter Integrator (amplifier) Integrator, generalized Intentional direct current isolation Interlock Mechanical Safety Internal shield, tube Interruptor, vibrator Intrinsic region Intrinsic variability Inverter (rotating machine) Ionically heated cathode Ionization chamber Ionizing radiation Dependence, sensitivity Emissivity Isolation, intentional dc Isolator (nonreciprocal) Isolator, photon-coupled
1.1.2 1.1.2.1 1.1.2.2 12.1 2.1.9 8.2.8 2.13.2 12.1 17.3 17.7
Jack Coaxial Connector Contact Jeweled signal ligh t Joint, rotary Junction, hybrid Junction of paths or conductors Junction transistor
5.3.3 5.6 5.3 4.2.1.1 11.2.8 15.7 15.4.2
Key, telegraph Key contact Key operated lock switch Key switch Key board (telegraph) Keyboard perforator Kinescope Klystron Knife switch
4.26 4.2.1.1 4.25.5 4.12 20.5.6.5 20.5.7.7 7.3.6 15.12 4.6.3
Lamp Ballast Cold-cathode Communication switchboard Fluorescent Glow Incandescent Indicating Neon Solid state
11.1 11.1.5 11.1.3 11.2.6 11.1.2 11.1.3 11.1.4 11.2.7 11.1.3 11.1.1 8.5.4.2 11.2.7 4.30 4.14.3 5.1.2 4.12
Switchboard Latching relay Lead-screw limit switch Letter combinations, terminal Lever-swi tch
Class Letter
Name Light Emitting diode Dluminating Indicating or pilot Jeweled signal Sensitive diode Signal Source, general Switchboard Light dependent device Lightning arrester Limit switch Spring return Limiter, current Limiting amplifier Line Distribution Loaded Overhead Radio Submarine Telephone Transmission Underground Underwater Line stretcher Linear adjustability Linear coupler Linear variability Link sensing Linkage, mechanical Liquid (recognition symbol) Liquid level switch Load-ratio control Autotransformer Transformer Loaded line Local battery telephone set Locking switch Loop antenna Loop coupling Electron tube Path Space Loudspeaker Loudspeaker microphone Loudspeaker-type telephone set Low-noise ground Low-pass filter Low-voltage power network
M R TC M A A
3.5 14.1 4.15 7.1.6.1 4.28 8.2.7 1.1.2 13.7 7.1.1.6 7.5 1.3.2 1.3.3 3.5 15.8.1 8.10
3.1.6 8.6.1
S G MG V
AT A,U J J J E DS E
HY
Q S E S S V V
S
Machine AC and dc composite Alternating current Direct current Rotating MagicT Magnet, permanent Magnetic Amplifier Blowout coil Core Core transformer Field dependent device Head Memory core Shielded windings
RT DS DS DS DS DS DS DS DS DS DS K
S S
103
Item Number
Class Letter
8.5.4.2 11.1.4 11.2.7 11.2.8 8.5.4.1 11.2.7 11.1.1 11.2.7 1.3 9.3 4.14 4.14.5 9.2 16.2.1
DS DS DS DS D,CR DS DS DS E S S F AR
3.2 3.2.5 3.2.4 3.2.6 3.2.3 3.2.1.1 3.2 3.2.2 3.2.3 15.19 1.1.1.3 6.5 1.1.2.1 2.12.3 14.1 1.4.2 4.18
S
6.4.10.2 6.4.11 3.2.5 20.6.2 4.10 2.3.3
T T W A S E
7.1.7.1 15.3 15.2.2 10.1.3 10.1.3.3
E CP CP
20.6.9 3.9.1.1 16.1.1.2 16.5.2
A
W W W W· W W W W W T SQ
LS LS
FL Z
13.7 13.5-6 13.4 13.1 15.4.2 2.8
MG B,G B,G
16.2 4.4 6.1.2 6.4.2 1.2.2 2.9 6.1.4 6.4.2.3
AR L E T
HY E
PU E
Magnetic-latching relay Oscillator
Name
Magnetic-latching relay Magnetically polarized relay Magnetoelectric generator Magnetoresistor Magnetron Major functional flow path Make contact Make switch Locking Nonlocking Pushbutton Make-before-break contact Make-before-break switch Male non polarized connector Manual Control Manual switchboard Manually restored drop Marconi antenna Marginal relay Master switch Mated waveguide flanges Mating connectors Measuring transducer Mechanical Connection Interlock Linkage Mercury pool tube Mercury switch Mesa transistor Message register Metallic rectifier Meter Metering device, outdoor Microammeter Microphone Microphone-loudspeaker MiUiammeter Minor functional flow path Mobile radio station Mode filter Mode suppressor Mode transducer Modifiers (see qualifiers) Modulator, field polarization, amplitude Modulator, diode-type ring Moist gas (recognition symbol) Momentary contact Momentary switch Monitoring amplifier Motion, mechanical Motional pickup transducer Motor Alternating current Compound, dc Converter Direct current Field Induction Multispeed Reluctance Series ac Split-phase Squirrel-cage Synchronous DC field Winding symbols
Magnetic-latching relay Oscillator
Index Item Number
Class Letter
4.30 4.30 13.5.10 2.1.7 15.11 19.1.1.1 4.3.2
K K
4.10.1 4.9.1 4.7.1 4.3.4 4.10.5 5.4.3 14.4 20.3.3 11.2.4 2.3 4.30 4.13.9 5.7.1-2 5.3.4 2.11
S S S S S J,P
14.1 14.1 14.1 7.3.7 4.32 8.6.1 12.2 8.5.1 12.1 6.4.21 12.1 10.2 10.1.3.3 12.1 19.1.1.2 20.1.3 15.16.1 15.6 15.5
G R V S
E K
S J,P J,P A,MT
V S
Q
M D,CR M T M
MK LS M
FL FL MT A,U D,CR
13.1.3.2 13.4.9.10 13.7.5 13.1.3.1 13.2 13.5 13.1.4 13.5.8 13.5.3 13.5.1 13.5.1 13.1.3.3 13.6.1 13.3
B B MG B L B B B B B B B B
Item Number
Class Letter
Movable short Moving contact Multiplier, electronic Multicell battery Mul tigap arrester Multiple monolithic transistor Multiposition switch Multispeed motor Multistub tuner Multiway switch Multiwinding coil Mushroom head switch
3.8.3 4.2.2 17.4 2.5.3 9.3.8 8.6.2.1 4.13 13.1.4 15.1.6 4.3.8 4.5.2 4.25.4
AT
N-emitter Plurality of Single Negative phase-sequence overcurrent (relay protective function) Neon lamp Network Low voltage power Phase changing Protector NIP region No bias relay Noise meter Noiseless clean earth Nonionizing electromagnetic radiation Dependence or emissivity Nonlinear Adjustability Resistor Variability Inherent Preset Nonlocking switch Nonpolarized connectors Nonreactive relay Nonreciprocal devices Directional phase shifter Nonshorting selector switch Normaled through connector NPIN with ohmic connection NPIP with. ohmic connection NPN transistor with multiple emitters NPN transverse biased NPNP switch, triode Numerous conductors
DS
15.8.6 16.8 1.4.4.2 4.2.1.3 4.7 16.2.1 14.2 2.11
Name
E
S AR
~
E
A BT E
Q S B Z
S K
S
8.2.4.2.1 8.2.4.2 9.5.12.18 11.1.3 16.5 16.5.2 16.6 9.4.3 8.2.2.2 4.30 12.1 3.9.1.1
DS Z Z Z
CB K
M
1.3.1 1.1.1.4 2.1.5 1.1.2.2 1.1.1.2 4.9 5.4.3-4 4.30 15.8 15.8.2 4.13.2 5.3.6 8.6.5 8.6.7 8.6.2 8.6.2.1 8.6.3 8.6.13.1 3.1.2.3
R
~
S J,P K Z
S J,P Q Q
Q Q Q Q
W
A,MT Ohmic drop exciter Ohmmeter Oil pressure meter One-time thermal-overload device One-way repeater One-way simplex telegraph repeater Open circuit Operating coil Operating quantity (relays) Operational amplifier Operator's set Optical shielding Oscillator
104
13.5.14:15 12.1 12.1
M M
9.1 16.4.1
F AR
20.4.1 3.8.1 4.5 9.5.9 17.1 10.3 1.11.2 2.7
AT L AR HS E G
~
Oscillograph Power
r
Oscillograph Power
Index Name
Oscillograph Oscilloscope Out-of-step (protective relay function) Outdoor metering device Output amplifier Output control, variable Overcurrent (protective relay function) Overfrequency (protective relay function) Overhead line Overtemperature (protective relay function) Overvoltage absorber P-emitter Plurality of Single PIN region Pad Page printing (telegraph) Qualifying symbol Receiver Pair Parametric amplifier Parametric diode Passive relay station Passive space station Path Air or space Conductive Crossing of Dielectric Junction of paths Transmission Pentode Perforated tape (telegraph) Permanent magnet Phase balance (relay protective function) Phase changing network Phase sequence quantities Phase sequence (relay protective function) Phase shifter Capacitor Differential Nonreciprocal Rotating machines VHF, UHF, SHF Phase shifting network Phasemet~r
Photocathode Photocell, barrier Photoconductive transducer Assymmetrical Symmetrical Photodiode Emissive type Sensitive type Photo-duo-diode Photoemissive diode with photo transistor (Isolator) Photon-coupled isolator Photosensitive cell
/tem Number
Class Letter
12.1 12.1
M M
9.5.12.20 6.4.21 16.2.1 2.4.4
T AR AT
Name
Phototransistor (2-lead) 8.5.10 Photo transistor (3-lead) 8.6.16 Phototube 7.3.5 Photovoltaic transducer 8.7.3 Physical state recognition symbol 1.4 Pickup 2.9 Picture tu be 7.3.6 Piezoelectric crystal unit 2.10 Pilot light 11.2.7 Pilot wire (relay protective function) Differential current (relay) 9.5.12.14 Directional comparison (relay) 9.5.12.15 Relay 9.5.7 PIN-type diode 8.5.12 Plain waveguide flanges 5.7.3 Planar transistor PNP-type 8.6.1 NPN-type 8.6.2 Playback head 2.9.3 Plug 5.3 Coaxial 5.6 Connector 5.3 Female 5.3.1 Ignitor 2.17 Male 5.3.2 Switchboard 5.3.5 Pneumatic (recognition symbol) 1.4.1 PIN region 8.2.2.1 PNIN with ohmic connection 8.6.6 PNIP with ohmic connection 8.6.4 PNP transistor 8.6.1 With case connected 8.6.1.1 PNPN switch Diode 8.5.8 Triode 8.6.12.1 Point contact transistor 8.6.1 Polarity markings 1.6.1.2 Instantaneous (windings) 1.6.3 Polarized capacitor 2.2.2 Polarized connector 5.4.5 Polarizing marking, instantanous 1.6.3 Polyphase transformer 6.4.16 Pool cathode 7.1.1.5 Pool cathode rectifier 7.3.7.5 Portable radio station 20.1.2 Position indicator 12.1 16.10 Position transmitter 16.11 Positional servomechanism 17.8 Positive phase sequence undervoltage (protective relay function) 9.5.12.17 Potential device, capacitor coupling 2.2.15-17 Potential transformer 6.4.20 Polarity marking 1.6.3.2 Potentiometer 2.1.3 Function 17.9 Potentiometer contact, adjustable 4.2.2.1 Power Amplifier 16.2.1 5.4 Connector Directional relay 9.Q..12.5 Factor meter i2.1 Flow 1.7 16.3 Rectifier
9.5.12.1 9.5.12.10 3.2.4 9.5.12.11 8.5.6 8.2.4.1.1 8.2.4.18.2.2.1 2.4.1 20.5.6.4 20.5.7.4 3.1.7.1 16.2 8.5.2 20.1.7 20.2.3 3.1 3.1.3 3.1.2 3.1.6 3.1.4 3.1.5 3.1 7.3.2 20.5.6.2 2.8 9.5.12.12 16.6 9.5.11 9.5.12.13 16.6 2.2.7 16.6.4 15.8.2 13.5.17-18 15.17 16.6 12.1 7.1.1.4 8.7.3
W D,VR
AT
W AR D,CR W W W W V E
K Z
K Z C Z Z Z Z Z M
BT
8.5.4 8.7.1 2.1.13 8.7.2 8.5.4 8.5.4.2 8.5.4.1 8.5.4.3
D,CR D,CR R R
8.10.4 8.10 8.7
A,U A,U
Item Number
DS D,CR D,CR
105
Class Letter D,CR Q V BT PU V Y DS K K K D,CR J,P
Q Q PU P P P P E P P Q Q Q Q D,CR Q
Q C J,P,X T V M M A
A,U T R R E AR J,P K M PS
Preamp Ringing relay
Preamp Ringing relay
Index Name
Supply DC Supply connectors Preamp Preamplifier stage Preset adjustability Continuous In steps Pressure operated switch Pressure tight bulkhead cable gland Primary detector Prime movers (generating stations) Prin ted wiring board chassis connectioq Printing reperforator (telegraph) Probe, test Probe coupling Program amplifier Proportional counter tube Protective functions, relay Protective gap Protective ground Protector Network Telephone Pushbutton switch Pushbutton telephone set Quad conductors Quartz crystal unit Radiation indicators Radio beacon Radio frequency cable, coaxial Radio link Radio station Reactance Capacitive Diode Inductive Infinite, L-C circuit Zero, L-C circuit Reactive factor meter Reactor Reading head Receiver Hearing aid Synchro Telegraph Telephone Receptacle Recorder set, sound Recording Demand meter Head Meter Pickup Unit Rectangular waveguide Rectifier Bridge-type Controlled Semiconductor (diode-type) Semiconductor (triode-type)
/tem Number
Class Letter
16.1.1.2 2.5.1 5.4 16.2.1 16.2.1 1.1.1.2 1.1.4.1 1.1.4.2 4.19 4.33
PS BT J,P AR AR
3.10 2.11
E MT
Name
Diode (semiconductor type) Electron tube Metallic Polarity marking Semiconductor Tube Gas filled Pool type Rectifying junction Reed, vibrator Regenerative-type telegraph repeater Register, message Regulating generator Regulating machine Regulator Bidirectional diode Current (diode) Induction voltage Load ratio control transformer Speed Step vol tage
S S
21.4 3.9.2 20.5.7.3 5.3.2 15.2.5 16.2.1 7.5 9.5.1 9.3.5 3.9.1.2 9.4.3 9.3.2 4.7.8 20.6.5 3.1.7.3 2.10
E CP AR V
E CB E S A W Y
1.3 20.1.5 3.1.9 3.2.6 20.1
W W
15.1.2.1 8.5.2 15.1.2.2 15.1.2.5 15.1.2.4 12.1 6.2 2.9.3
Z D,CR Z Z Z M L PU
10.4 13.8 20.5.3 10.4 5.3.3 16.1.1.2
HT B HT J,P A
12.1 2.9.2 12.1 2.9.2 16.1.1.2 3.6.2
M PU M PU A W
16.3 16.3.2 8.5.8.9 8.6.12, 13,15
Unidirectional diode voltage Relay Coil Basic Contact Demand totalizing meter Functions (protective) Operating coil Operating quantities Protective functions Shunt Thermal Reluctance motor Remanent relay Repeater Repeating coil (see transformer) Reproducer Sound Reproducing unit RepUlsion motor Repulsion-start motor Resistance (discontinuity) Resistance, lamp Resistive termination Resistor Adjustable Heating Nonlinear Shunt Tapped Thermal (thermistor) Voltage sensitive Resolver Resonator Cavity Tube (cavity type) elements Return circuit Reversible direction circulator RF amplifier RF coupler, rotary Rheostat Ridged waveguide Ringer, telephone Ringing relay
PS D,CR
/tem Number
Class Letter
8.5.1 7.1 8.5.1 16.3.4 8.5.1
D,CR V D,CR
7.3.4.1 7.3.7.3-5 8.2.2 4.2.2.5 20.4.5.4 12.2 13.4.20 13.5.16
~
D,CR V V MP
M G G
8.5.6.2 8.5.11 6.4.12-14 6.4.11 4.27 6.4.10 6.4.10.1 6.4.12-14 8.5.6.1 4.30 4.5 4.30.1 4.2.1.1 12.1 9.5.1 4.5 9.5.9 9.5.1 2.1.9 4.30.5 13.5.8 4.30 16.4
D,VR D,CR T T S VR T VR D,VR K L
2.9 2.9.3 16.1.1.2 13.5.1 13.5.6 15.1.2.3 11.1.5 2.2.11 2.1 2.1.3 2.1.8 2.1.5 2.1.10 2.1.2 2.1.12 2.1.6 13.8
PU PU
15.9 15.10 3.9 15.8.4.1 16.2.1 15.7 2.1.4 3.6.6 10.1.1 4.30
Z
E M L
~
R K B K AR
A
B B Z RT AT R R HR R
R R
RT RV B
HY AR E R W LS K
.~~
"
106
Rotary Speed regula tor
Rotary Speed regulator
Index !\'ame
Rotary Amplifier Coupler Joint Phase converter Switch Rotary converter, dc to dc Rotating Amplifier Armature Electrical contact ring (slip ring) Machine Rotation Rotation speed indicator Rotator, field polarization Safety gap Safety ground Safety interlock Circuit closing Circuit opening Sandwich line Sandwich wound relay Saturable-core inductor Saturab le-core reactor Scott connection SCR (see semiconductor controlled rectifier) Sector switc h Segmental contact switch Selector switch Self'interrupting switch Semiconductor controlled rectifier (SCR) Semiconductor controlled switch Semiconductor dev ice Diod e Element symbols Hall element HaJJ genera tor Photose nsitive cell Rules Solid-state thyratron Terminals Tetrode Th ermoc oupl e Three-terminal dev ices Two terminal devices Sensing link Sensor Temperature Separate drive vibrator Separately excited field Series element (d isconti nunity) Series field Servomechanism, positiona l Set Facs imile Operator's Shaded·pole motor Shaft operated switch Shield, shielding Electr ical Electron tube Magnetic Optical Shielded Five conductor cable
Item Nu mber
Class Letter
13.4.20·23 15 .7 15.7 13.5.1 4 .14.4 13.4.24
G E E B S MG
13.4.20·23 13.1.5
G E
4 .2.2.7 13. 1 14 .2.3 14.2.6
SR B,G
15.8.1
A,U
9.3 3.9.1.2 4.15 4.15.2
4.15.1 3.7.2 4 .30 6.3 6 .3 1.9.10
Na me
E
S S S W
K L L
4.6 .7 4.13.4 4.13 4.22
S S S S
8.6.2,13 8.6.14 8.1 8.5 8.2 8 .9 8.9 8.7 8.4 8.11 5.1.2 8 .6.14 8.8 8.6 8.5 2.12.3 2.11 2.16 4.28 .2 13.2.3 15.1.1 13.2.2 17.8
Q Q D,CR,YR E E
Q E Q TC E SQ MT E G L Z L A
16.1.1.2 10.3 13.5.5 4.24 1. 1 1 1.11.1 7.1.6 1.11.1 1.11.2
A,U HS B S E E E E
3.1.8.2
W
107
Single co nductor Transformer Two cond uctor cable Shi fter, phase Nonreciprocal Rotating machine VHF, UHF, SHF Shockley diode Short circuit Shorting selector switch Shunt Capacitor Drive vibrator Element, discont inuity Field Conductor Instr ument relay Resistor Signal code Signal Dow Signal light Signaling device Audible Visua l Simultaneous printing l perforating (te legraph ) Single·current telegraph repeater Single headset Single phase transformer Single-throw sw itch Siren Six-phase symbo ls Sleeve Slide screw tuner Slide switch Sliding contact Slip ring Slow operate and rel ease relay Slow o perate relay Slow release relay Slow·wave structure Snap-off diode Solar cell Solenoid Solid dielectric waveguide Solid (recognition symbol) Solid·state thyrat ron Solion Sound projector, und erwater Sound recor der head Sound reproducer head Sou nd-powered telephone set Sou nder , telegraph Source, general ized ac Space path Space station Spark gap Speaker Special cable indica to r Special connector indica tor Special features Adjustability Preset Special-property Device symbols In dicators Speed operated sw itch Speed regulator
It em Number
3.1.8.1 6.4.2.2 3.1.8.4 16.6 1 5.8.2 13.5 .17·18 15.17 8.5.8 3.8.2 4.13.3
Class Lefl er W
T W
Z Z Z Z CR,D E S
2.2.9 4.28.1 15.1.3 13.2.3 6.2.6 2.1.9 2.1.10 19.1.2 1.7 11.2.7
C G Z L L R R
10.1 11.2
LS DS
DS
20.5.6.3 20.4.4.2 10.4 .3 6.4.15
4.6.1 10 .1.3 1.9.11.14 4.2.1.3 15.1.4 4.13.8 4.2.2.1 4 .2.2.7 4.30 4.30 4.30 2.6.3 8 .5.9 8.7.3 4.5 3.6.2.2 1.4.3 8. 11 7.4 10.1.3 2 .9.2 2.9.3 20.6.11 10.1.4 2.7 3.1.3 20.2 9.3 10.1.3 1.13 1.1 3
HT T S LS Z S E SR K K K DL D,CR BT L W
Q V LS PU PU A LS
E LS
1.1.3 1.1.4 8.3 1.2 4.24 4.27
S S
Sphere gap Telephone
Name
'.
Sphere gap Telephone
Index
Sphere gap Splice Split envelope tube Split-phase motor or generator Split-reed vibrator Split-stator capacitor Spring return switch Squib Explosive Igniter Squirrel-cage machine Stabistor Standard volume indicator Star connection Station, telephone Steam (recognition symbol) Step-recovery diode Step-voltage regulator Stereo head Storage diode Stretcher, line Strip, bimetallic Strip-type transmission path Stripline Balanced Unbalanced Structure, slow-wave Submarine line Substation Subsynchronous motor Summing amplifier , Supply, power Suppression, mode Surface barrier transistor NPN-type PNP-type Surge arrester Susceptance, capacitive Inductive Infinite Zero Switch Aneroid Breaker Centrifugal Combination locking and nonlocking Contact Contactor Flow-actuated Foot-operated General Governor Hook Horn gap Interlock, safety Key Knife Lever Limit Liquid-level-actuated Locking Mercury Multiposition Multiway Nonlocking Pressure-actuated Pushbutton
Item Number
Class Letter
9.3.6 3.1.6.4 1.10.2 13.5.1 4.2.2.6 2.2.8 4.7 2.12 2.12.1 2.12.2 13.5.1 8.5.1 12.1 1.9.7 16.1.1.2 1.4.4.2 8.5.13 6.4.10.1 2.9.6 8.5.5 15.19 2.14 3.7
E E
Semiconductor controlled Safety, interlock Selector Sector Sector switch Self-interrupting switch Telegraph key Telephone Temperature-actuated Thermal cutout (flasher) Thermostat Time-delay Two-circuit
B,G MP C. S SQ SQ SQ B,G CR M A
Vibrator Switch, inertia Switch contact Switchboard Jack Lamp Light Manual Switching, automatic Switching function Symmetrical varistor Symmetrical waveguide connector Synchro Synchronous Condenser Converter Frequency changer Generator Induction motor Motor (Induction) Synchroscope
D,CR T PU D,CR W
W
3.7.2 3.7.1 2.6.3 3.2.3 21.5 13.5.9 17.2 16.1.1.2 15.6
W W DL W
8.6.2 8.6.1 9.3 15.1.2.1 15.1.2.3 15.1.2.4 15.1.2.5 4.6 4.33 9.4 4.24
Q
4.11 4.2.12 4.29 4.17 4.23 4.6 4.27 4.25.1 4.6.6 4.15 4.12 4.6.3 4.12 4.14 4.18 4.10 4.32 4.13 4.3.8 4.9 4.19 4.33 4.7
Name
B AR PS Z
Q
E Z Z Z Z S S CB S
T or Y adapter Tape printing (telegraph equipment) Qualifying symbols Receiver Tapped -- Delay function Heater Inductor Resistor Transformer Telegraph Equipment Key Repeater Sounder Telemeter Telephone Bell Dial Dial switch Handset Headset Line equalizer Operator's set Protector block Receiver Ringer Set
S E S S S S S S S S S S S S S S S S S S S S
108
Item Number
Class Letter
8.6.14 4.15 4.13 4.13 4.6.7 4.22 4.26 4.25.2 4.20 4.22 4.21 4.16 4.7.3 4.8 4.9.3 4.28 4.31 4.2
Q S S S S S S S S S S S S S S G S E
5.3.5.1 11.2.6 11.2.7 20.3.3 20.3.2 4.1 2.1.6
J DS DS
5.7.1 13.8
J,P B
13.6.1-4 13.7.1-4 13.6.5-6 13.6.1-4 13.5.2 13.6.1-4 13.5.2 12.1
G MG MG G B B
5.6.5
CP
~
., ..... --
RV
~
B
M
20.5.6.1 20.6.7.1
2.6.2 7.2.3 6.2.3 2.1.2 6.4.7 20.5 4.26 20.4 10.1.4 12.1 10.1.1 16.1.1.2 4.25.2 10.3 10.4 16.1.1.2 10.3 9.3.2 10.4 10.1.1 20.6
DL L R T S LS M LS S S HS HT
EQ
HS E HT LS A
~
Teleprinter Triax
Name
/tern Number
Station 16.1.1.2 Transmitter 10.2 Teleprinter 16.1.1.2 Teletypewriter 16.1.1.2 Temperature Actuated switch 4.20 Dependent device 1.2.1 Dependent diode 8.5.3 Measuring thermocouple 2.13.1 Semiconductor 8.8.1 Meter 12.1 Temperature sensor 2.16 Sensing element 2.1.12 Tenpoint selector switch 4.13.6 Terminal board 5.1.1.1 Terminal discontinuity 15.1.1.1 Terminal Circuit 5.1.1 Electron tube, semiconductor devices, etc. 5.1.2 Base pin 5.1.2.1 Connected to envelope 5.1.2.5 Envelope 5.1.2.2 Keyed 5.1.2.5 Reference point 5.1.2.4 Terminating element 3.8 Termination 3.8 Cable 5.2 Capacitive 2.2.10 Inductive 6.2.7 Resistive 2.1.11 3.8.2 Short circuit Test 5.5 Block Clip 5.3.1 1.5 Point 5.3.2 Probe Thermal 12.1 Converter 4.22 Cutout Element 2.14 Relay 4.30.5 Resistor 2.1.12 Thermistor 2.1.12 Thermoelectric generating station 21.3 Thermocouple 2.13 Insulated heater 2.13.2.2 Internally connected heater 2.13.2.1 Thermopile 2.13.3 Thermostat 4.21 Three conductors 3.1.2.2 Three-phase symbols 1.9.3-10 Three-pole knife switch 4.6.4 Three-position switch 4.3.8.2 Three-position transfer switch 4.10.4 Three-wire phase shifter 16.6.2 Thyratron 7.3.9 Solid-state 8.11 Thyristor Diode type, bidirectional 8.5.9 Diode type, reverse-blocking 8.5.8 Semiconductor controlled rectifier N-type gate 8.6.12 P-type gate 8.6.13 Semiconductor controlled switch 8.6.14 Tetrode type, reverse-blocking 8.6.14
~
f"
Teleprinter Triax
Index Class Letter
Name
A
Traic, gated switch Triode type Bidirectional Reverse-blocking N-type gate P-type gate Time closing contact Time-delay switches Time-opening contact Time-sequential closing contact Toggle-switch Locking Nonlocking Torque (synchro) Differential receiver Di fferen tial transmi tter Receiver Transmitter Torque amplifier Total time meter TR tube Track switch Closing Opening Transducer Measuring Mode Motional pickup Photoconductive Asymmetrical Symmetrical Photovoltaic Thermomechanical Transductor Transfer (switching function) Transfer contact Transformer Adjustable Inductance Auto Bank, 3 phase Connection symbols Current Load-ratio control
MK A A S D,CR TC TC M E RT S TB Z E
AT AT E AT AT
AT E TB E E M S HR K RT RT
Polyphase Potential Saturating Single-phase Synchro control Three winding Winding with adjustable inductance Transistor Darlington Transition region Translation (motion) Transmission line Transmission path Transmitter Position Synchro Telegraph Telephone Traveling-wave Structure, slow Tubes Triac Triax (cable)
TC TC TC TC S W
S S S Z V
Q D,CR D,CR
Q Q Q Q
" -......
"'-
109 4£.'
Item Number
Class Letter
8.6.15
Q
8.6.15
Q
8.6.12 8.6.13 4.3.5 4.16 4.3.6 4.3.7
Q Q
S S S S
4.10 4.9
S S
13.8 13.8 13.8 13.8 16.2.1 12.1 15.13 4.14.1 4.14.2
B B B B AR M V S S
2.11 15.5 2.11
A,MT MT A,MT
8.5.4.1 2.1.13 8.7.3 2.14 6.3 4.1.3 4.3.3 6.4 6.4.9 6.4.4-6 6.4.8-10 6.4.15.1 1.9 6.4.18 6.4.10.2 6.4.11 6.4.16 6.4.20 6.4.3 6.4.15 13.8.2 6.4.17
D,CR R BT HR L S S T T T T T
6.4.4-5 8.1 8.6.17 8.2.6 14.2 3.2 3.1
T
T T T T T T T B T
Q W W
16.11 13.8.2 20.5.2 10.2
MK
2.6.3 15.14 8.6.15 3.1.9.4
DL V Q W
B
Trigger diac Waveguide
Trigger diac Waveguide
Index Name
Trigger diac Trimmer capacitor Triode Triple-twisted conductors Tube Ballast Electron (see electron tube) Tunable resonator Tuned cavity Tuner E-H Slide screw Tunnel diode Tunneling (special-property indicator) Twinax (cable) Twin-triode electron tube Twisted pair conductor Twisted waveguide Two-circuit switch Maintained Mementary Nonlocking Two-conductor cable Two conductors (path) Two-phase Connection Winding (rotating machine) Two-pole double-throw switch Two-pole field-discharge switch Two-position switch Two-position transfer switch Two-way Repeater Bypassed Simplex Telegraph repeater
Item Number 8.5.6.3 2.2.4 7.3.1 3.1.7.2
RT V
15.1.5 15.1.4 8.5.7.1
Z Z
Z Z
D,CR
8.3.2 3.1.9.3 7.3.3 3.1.7.1 3.6.5
W V W W
4.8 4.7.3 4.9.3 3.1.8.5 3.1.2.1
S S S W W
1.9.1.2 13.3.2 4.6.2.1 4.6.5 4.3.8.1 4.10.3 16.4.2 16.4.3 20.5.4 20.4..2
4.19 7.1 9.3.7 8.5.2 12.1
Name
D,CR C V W
11.1.5 7.1 15.9.3 15.9
Unbalanced Attenuator 2.4.3 Fixed 2.4.3 Variable 2.4.6 Stripline 3.7.1 Under (protective relay function) 9.5.3 Underground cable 3.2.2 Underground line 3.2.2 Undervoltage (protective relay function) 9.5.12.4 Underwater line 3.2.3 Underwater sound projector 10.1.3 2.4.4 Unidirectional attenuator Unidirectional negative-resistance breakdown diode 8.5.6.3 Unijunction transistor N-type 8.6.8 P-type 8.6.9 Unit 2.10 Piezoelectric crystal Recording 16.1.1.2 Reproducing 16~1.1.2 Vacuum-operated switch Vacuum tube Valve element arrester Varactor Varhour meter
Class Letter
S S S S AR AR
AT AT AT W
Item Number
Class Letter
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1.1
Variability Adjustability Continuous Steps General Inherent (intrinsic) Linear Inherent Nonlinear Inherent Preset Continuous Steps Variable Attenuator Capacitor Delay element Inductance Resistor Varicap Varistor Asymmetrical Symmetrical Varmeter Velocity, angular Velocity modulated tube Vibrator Interruptor Reed Split-reed Visual-signaling device Volt-ammeter Voltage reference diode Voltage regulator Auto transformer Bidirectional diode Control transformer Diode Induction 3-phase induction Triplex induction Tube Voltage sensitive resistor Voltmeter Volume indicator
6.4.10 8.5.6.2 6.4.11 8.5.6 8.4.12 6.4.14 6.4.13 7.3.4.1 2.1.6 12.1 12.1
Wafer switch Watthour meter Wattmeter WavegUide Circular Coaxial Connector Coupler, directional Coupling Directric-fUled metallic Flexible Gas filled Mode transducer Mode suppressor Rectangular Resonator Ridged Rotary coupler Rotary joint Sandwich line Solid-dielectric
4.13.7 12.1 12.1 3.6 3.6.1 3.6.3 5.7 15.8 15.2 3.6.2.1 3.6.4 3.6.2.3 15.5 15.6 3.6.2 15.9.2 3.6.6 15.7 15.7 3.7.2 3.6.2.2
1.1.3.1 1.1.3.2 1.1.1.1 1.1.2 1.1.1.3 1.1.2.1 1.1.1.4 1.1.2.2 1.1.1.2 1.1.4.1 1.1.4.2 2.4.4 2.2.1 2.6.3 6.2.4 2.1.4 8.5.2
AT C DL L R D,CR
8.5.1 2.1.6 12.1 14.2.6 15.12 4.28 4.28 4.2.2.5 4.2.2.6 11.2 12.1 8.5.6.1
D,CR RV M V G G MP MP
DS M VR
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W W W LS AT D,CR
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S M M W
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W Z
W E E W W
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Waveguide flange Zig-zag connection symbol
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Name Stripline Termination Twisted Waveguide flange Choke Mated Plain Winding Connection symbol Field Operating coil Symbols (rotating machine) Transformer Wiring Alternate Wound rotor motor Writing head Wye Grounded (rotating machine) Ungrounded (rotating machine) Wye connection
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Index Item Number
Class Letter
3.7.1 3.8 3.6.5 5.7 5.7.4 5.7.1-2 5.7.3 6.2 1.9 13.2 4.5 13.3 6.4.1 3.1 3.3 13.5.2 2.9.2
W AT W J,P J J,P P L
Name
L L T W B
PU
13.3.4 13.3.3 1.9.7
X-ray tube
7.3.8
V
Yadapter
5.4.5
CP
Zener diode Zig-zag connection symbol 3-phase 6-phase, double
8.5.6.1
D,VR
1.9.9 1.9.14
111
Item Number
Class Letter
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