Specification for
PVC-insulated cables for switchgear and controlgear wiring
ICS 29.060.20
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| BS 6231:1998 | | Incorporating | | Amendment No. 1 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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BRITISH STANDARD
BS 6231:1998
Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee GEL/20, Electric cables, to Subcommittee GEL/20/1, Wiring cables, upon which the following bodies were represented: Association of Consulting Engineers Association of Manufacturers Allied to the Electrical and Electronic Industry (BEAMA Ltd) British Approvals Service for Cables British Cable Makers Confederation British Plastics Federation British Retail Consortium Chartered Institution of Building Services Engineers Department of Trade and Industry Ð Consumer Safety Unit, C A Division Electricity Association ERA Technology Ltd. Electrical Installation Equipment Manufacturers Association (BEAMA Ltd.) Engineering Industries Association Institution of Incorporated Executive Engineers Lift and Escalator Industries Association London Underground Ltd. Portable Electric Tool Manufacturers Association Transmission and Distribution Association (BEAMA Ltd.)
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This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 August 1998 © BSI 17 June 2005 First published, as BS 1231, July 1945 Second edition, November 1958 Third edition, February 1963 Fourth edition, as BS 6231, August 1969 Fifth edition, May 1978 Sixth edition, December 1981 Seventh edition, October 1990 Eighth edition, August 1998
Amendments issued since publication Amd. No.
Date
15648
17 June 2005 Certification notice in Foreword changed and deleted on inside back cover
Text affected
The following BSI references relate to the work on this standard: Committee reference GEL/20/1 Draft for comment 96/215021 DC ISBN 0 580 29572 9 Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy No reproduction or networking permitted without license from IHS
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BS 6231:1998
Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Normative references 1 3 Definitions 1 4 Temperature ratings 1 5 Voltage designations 1 6 Identification 2 7 Marking 2 8 Conductors 2 9 Insulation 3 10 Construction and overall dimensions 3 11 Dimensional test methods 3 12 Electrical requirements and test methods 3 13 Durability of colours and marking 5 14 Test under fire conditions 5 Annex A (informative) Guidance on installation and operating temperatures 12 Bibliography Inside back cover Table Ð 1 Constructional details and maximum resistance for small circular tinned annealed copper conductors not included in BS 6360 2 Table 2 Ð Spare 4 Table 3 Ð Voltage values for voltage test 4 Table 4 Ð Thermal endurance test voltage 5 Table 5 Ð Types AU and AK PVC-insulated cables 6 Table 6 Ð Types BU and BR PVC-insulated rigid cables 7 Table 7 Ð Type BK PVC-insulated flexible cables 8 Table 8 Ð Types CU and CR PVC-insulated rigid cables 9 Table 9 Ð Type CK PVC-insulated flexible cables 10 Table 10 Ð List of tests applicable to the various types of cable 11
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i
BS 6231:1998
Foreword This new edition of BS 6231 has been prepared by Technical Subcommittee GEL/20/1 and supersedes BS 6231:1990 which is withdrawn. It introduces technical changes but does not reflect a full review or revision of this standard, which will be undertaken in due course. As specified in the previous edition, this standard adopts the voltage designation for some types of harmonized single-core PVC-insulated cables in CENELEC Harmonization Document HD 21. --``,,,,,,,,,,,,,``,,,,`,,``,,`-`-`,,`,,`,`,,`---
Although CENELEC has now agreed to a 600/1 000 V rating for some cables of the types specified in BS 6004 when installed inside equipment in protected conditions, the electrical controlgear industry has requested continuation and revision of BS 6231, rather than its withdrawal, because some requirements cannot always be fulfilled by the use of cables conforming to other British Standards. To meet the requirements of the electrical switchgear and controlgear industry, a new range of cables, types CR, CU and CK, has been introduced for operation at a designated temperature of 85 8C. These cables are dimensionally similar to the existing types BR, BU and BK. The opportunity has also been taken to align types AU and AK cables contained in this standard with those of BS 4808-2. Annex A (informative) gives guidance on installation and operating temperatures. Cables conforming to this standard are deemed also to conform, for corresponding sizes, to the requirements of the corresponding classes of BS 4808, BS 6004 and BS 6500. Because of the more stringent requirements of this standard, the converse is not necessarily true. Product certification/inspection/testing. Users of this British Standard are advised to consider the desirability of third-party certification/inspection/testing of product conformity with this British Standard. Users seeking assistance in identifying appropriate conformity assessment bodies or schemes may ask BSI to forward their enquiries to the relevant association.
A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.
Summary of pages This document comprises a front cover, an inside front cover, page i and ii, pages 1 to 12 and a back cover.
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BS 6231:1998
1 Scope This British Standard specifies requirements for single-core non-sheathed cables, including flexible cables, used for the wiring of switch, control, metering, relay and instrument panels of power switchgear, and for such purposes as internal connections in rectifier equipment and in motor starters and controllers. The types of cable specified in this standard are as follows: Type
AU AK BR BU BK CR CU CK
Form of conductor
Rigid, round, Flexible Rigid, round, Rigid, round, Flexible Rigid, round, Rigid, round, Flexible
Designated temperature
70 8C 70 8C stranded 70 8C solid 70 8C 70 8C stranded 90 8C solid 90 8C 90 8C solid
Rated voltage
60 V 60 V 600/1 000 V 600/1 000 V 600/1 000 V 600/1 000 V 600/1 000 V 600/1 000 V
2 Normative references --``,,,,,,,,,,,,,``,,,,`,,``,,`-`-`,,`,,`,`,,`---
The following normative documents contain provisions which, through reference in this text, constitute provisions of this British Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. For undated references, the latest edition of the publication referred to applies. BS 2011:1981, Environmental testing Ð Part 2.1T: Test T Soldering. BS 4066-1, Tests on electric cables under fire conditions Ð Part 1: Method of test on a single vertical insulated wire or cable. BS 4066-2, Tests on electric cables under fire conditions Ð Part 2: Method of test on a single small insulated wire or cable. BS 4727, Glossary of electrotechnical, power, telecommunication, electronics, lighting and colour terms Ð Part 2: Terms particular to power engineering Group 08 Electric cables. BS 5099, Spark testing of electric cables. BS 6360, Specification for conductors in insulated cables and cords. BS 7655-3.1, Specification for insulating and sheathing materials for cables Ð Part 3: PVC insulating compounds Ð Section 3.1: Harmonized types.
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BS 7655-3.2, Specification for insulating and sheathing materials for cables Ð Part 3: PVC insulating compounds Ð Section 3.2: Hard grade types. BS EN 60811-1-1:1995, Insulating and sheathing materials for electric cables. Common test methods Ð Part 1-1: General application Ð Measurement of thickness and overall dimensions. Tests for determining the mechanical properties. PD 2379, Register of colours of manufacturers' identification threads for electric cables and cords .
3 Definitions For the purposes of this British Standard the definitions relating to electric cables given in BS 4727 apply.
4 Temperature ratings The designated temperatures quoted are the temperatures assigned to the same materials in BS 6004, BS 6500 and BS 7655. The combination of ambient temperature and temperature rise due to load should not result in a conductor temperature exceeding the designated temperature. NOTE Attention is drawn to annex A which gives guidance on installation and operating temperatures.
5 Voltage designations 5.1 Types AU and AK cables shall be designated by the rated voltage, which is 60 V. They are intended for use where the operating voltage to earth does not exceed 60 V. They are suitable for wiring circuits which are tested with d.c. at a voltage not exceeding 500 V. NOTE Where the fault power is low and adequate mechanical protection is provided, these types may be used at voltages higher than 60 V by agreement between the purchaser and the manufacturer.
5.2 Types BU, BR, BK, CU, CR and CK cables shall be designated by the rated voltages U0 and U expressed in the form U0/U, where U0 is the power-frequency voltage to earth for which the cable is designed, and U is the power-frequency voltage between phase conductors for which the cable is designed. The rated voltage for these cables is 600/1 000 V. These cables are intended for use at alternating voltages not exceeding 600 V to earth, and direct voltages not exceeding 1 000 V to earth. They are suitable for wiring circuits for which the prescribed alternating test voltage, when installed in the equipment, does not exceed 4 kV r.m.s. for 1 min.
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1
BS 6231:1998
6.1 All cables shall be identified by colour as listed in Tables 5, 6, 7, 8 and 9. The colour shall be either throughout the whole of the insulation or on its surface. 6.2 For types AU and AK cables, the colours of bi-colour combinations shall be uniform and the form shall be either continuous helical marking or ring marking which, when viewed from any side, shall be readily identifiable within every 15 mm of length. 6.3 On types BU, BR, BK, CU, CR and CK cables marked with the bi-colour combination green/yellow, the distribution of these colours shall conform to the following condition. On the core marked with the bi-colour combination green/yellow, the distribution of the colours shall be such that for every 15 mm length of core, one of these colours shall cover at least 30 % and at most 70 % of the surface of the core, while the other colour covers the remainder of the surface. NOTE 1 In cases of dispute and where appropriate to the method of colour marking of the insulation, a suitable test for checking conformity is given in BS 6469-99.1:1992, clause 8. NOTE 2 Information on the use of the colours green/yellow. It is understood that the colours green and yellow when they are combined as specified above are recognized exclusively as a means of identification of the core intended for use as earth connection or similar protection.
6.4 The colours of the cables shall be durable and easily discernible. Conformity shall be checked by the test described in clause 13.
7 Marking (not applicable to types AU and AK) 7.1 Types BU, BR, BK, CU, CR and CK cables shall be provided with an indication of origin consisting of either an identification thread or the continuous marking of the manufacturer's name or trade mark. This marking may be by printing, indenting or embossing. 7.2 If coloured threads are used, the colours shall be in accordance with those registered in PD 2379. The colours of identification threads shall be easy to recognize or shall become recognizable by cleaning with petrol or any other suitable solvent, if necessary. 7.3 The designated temperature shall be indicated on types CU, CR and CK cables in the following form: HEAT RESISTING 90 The marking shall be by printing, indenting or embossing, and shall be legible and easily discernible.
7.4 Each specified mark shall be regarded as continuous if the distance between the end of the mark and the beginning of the next identical mark does not exceed 275 mm. 7.5 Any marking by printing shall be durable. Conformity shall be checked by the test prescribed in clause 13.
8 Conductors 8.1 The conductors shall be circular, plain or tinned, annealed copper conductors as specified in 8.2 to 8.6. 8.2 For type AU cables, the conductors shall be tinned annealed copper conductors. The number and nominal diameter of wires and the maximum resistance at 20 8C shall conform to the appropriate requirements given in Table 1. 8.3 For type AK cables, the conductors shall be tinned annealed copper conductors. They shall conform to the appropriate requirements of BS 6360 for class 5 conductors. 8.4 For types BK and CK cables, the conductors shall be either plain annealed or tinned annealed copper conductors. They shall conform to the appropriate requirements of BS 6360 for class 5 conductors. 8.5 The conductors of types AU and AK cables, and of types BK and CK when tinned annealed copper conductors are used, shall conform to the requirements for solderability when tested in accordance with Test Ta, Method 1 : Solder bath at 235 8C, given in BS 2011-2.1T:1981. 8.6 For all other types of cable the conductors shall be plain annealed copper conforming to the appropriate requirements of BS 6360 for class 1 or class 2 conductors. Table 1 Ð Constructional details and maximum resistance for small circular tinned annealed copper conductors not included in BS 6360 Nominal cross-sectional area
Number and nominal diameter of wires
Maximum resistance of conductor at 20 8C
mm2
mm
V/km
0.2 0.28 0.5
1/0.50 1/0.60 1/0.80
92.2 64.1 36.0
NOTE This marking may be combined with the marking specified in 7.1.
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6 Identification
BS 6231:1998
9.1 The insulation shall be PVC compound of the following types as designated in BS 7655 and shall conform to the appropriate requirements of that standard, as follows: Types AU and AK cables: PVC type 2 or type TI 1 conforming to BS 7655-3.2 or -3.1 respectively, as specified in Table 5. Types BU, BR and BK cables: PVC type TI 1 conforming to BS 7655-3.1. Types CU, CR and CK cables, PVC type TI 3 conforming to BS 7655-3.1. Conformity shall be checked by performing the tests indicated in the appropriate column of Table 10. 9.2 The insulation shall be closely applied to the conductor. It shall be possible to remove the insulation easily without damage to the insulation itself, to the conductor or to any tin coating. Conformity shall be checked by examination and by a manual test. 9.3 For types AU and AK cables, the radial thickness of insulation shall be not less than the appropriate minimum value given in Table 5. For all other types of cable, the mean value of thickness of insulation shall be not less than the value specified for each type and cross-sectional area of cable in Tables 6, 7, 8 and 9. The thickness at any measured place may be less than the mean value specified, but the difference shall not exceed 0.1 mm +10 % of the mean value specified. Conformity shall be checked by the test method described in 11.1.
10 Construction and overall dimensions 10.1 The construction shall be as given in Tables 5, 6, 7, 8 or 9, as appropriate. Conformity shall be checked by examination and by measurement. 10.2 The mean overall diameter shall not exceed the appropriate upper limit given in Table 5, 6, 7, 8 or 9. Conformity shall be checked by the method prescribed in 11.2.
11 Dimensional test methods 11.1 Measurement of insulation thickness. Take a sample of cable from three different places, separated by at least 1 m. Prepare the samples and take six thickness measurements on each sample, in accordance with BS EN 60811-1-1, 8.1, including the minimum thickness
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Take the mean of the 18 values, after rounding, as the mean value of insulation thickness. For a specified mean thickness of 0.5 mm or above, round the calculated mean value to one decimal place, 0.05 being rounded upwards. For a specified mean thickness of below 0.5 mm, round the calculated mean value to two decimal places, 0.005 being rounded upwards. Take the smallest of the 18 values as the minimum thickness of insulation at any point. 11.2 Measurement of overall diameter. Take a sample of cable from three different places, separated by at least 1 m. Take diameter measurements in accordance with BS EN 60811-1-1:1995, 8.3. For diameters not exceeding 25 mm, take the mean of the six measurements as the mean overall diameter For diameters exceeding 25 mm, take the mean of the three measurements as the mean overall diameter. When embossing in accordance with 7.1 or 7.3 is used, the points at which measurements are made shall not coincide with the embossing.
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9 Insulation
12 Electrical requirements and test methods 12.1 Requirements 12.1.1 Types AU and AK These cables shall be subjected at the manufacturer's works to the spark test prescribed in 12.2.2 and shall withstand the test voltage without failure of the insulation. When tested in accordance with 12.2.3, the insulation shall not break down. When tested in accordance with 12.2.4, the insulation resistance shall be not less than the appropriate value given in Table 5. These cables shall also be capable of withstanding the thermal endurance test prescribed in 12.2.6 without breakdown of the insulation. 12.1.2 Types BU, BR, BK, CU, CR and CK These cables shall be subjected at the manufacturer's works to the spark test prescribed in 12.2.2 and shall withstand the test voltage without failure of the insulation. When tested in accordance with 12.2.3, the insulation shall not break down. When tested in accordance with 12.2.4, the insulation resistance shall be not less than the appropriate value given in Tables 6, 7, 8 or 9. When tested in accordance with 12.2.5, the exterior of the insulation shall show no signs of damage nor suffer electrical breakdown (discoloration of the insulation shall be ignored).
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BS 6231:1998
12.2 Test methods
12.2.4 Insulation resistance test
12.2.1 General Tests shall be performed at an ambient temperature of (20 ± 15) 8C unless otherwise specified in the details for the particular test. Unless otherwise specified in the particular test, the frequency of the alternating test voltages shall be in the range of 49 Hz to 61 Hz. The waveform shall be substantially sinusoidal.
12.2.4.1 General When an insulation resistance test is made, it shall be performed in accordance with 12.2.4.2 or 12.2.4.3, as appropriate. The test given in 12.2.4.2 shall normally be performed with the water at ambient temperature, but in case of dispute the temperature of the water shall be (20 ± 5) 8C. The test given in 12.2.4.3 shall be performed with the water at a temperature of (70 ± 2) 8C for types BU, BR and BK, or (90 ± 2) 8C for types CU, CR and CK.
12.2.2 Spark test The core insulation shall conform to the requirements for spark testing given in BS 5099 when tested in accordance with the a.c. or d.c. test methods specified in that standard. Table 2 Ð Spare 12.2.3 Voltage test 12.2.3.1 Types AU and AK. Immerse in water, for not less than 24 h, a sample 5 m in length. Earth the water and maintain it at (20 ± 5) 8C. With the cable still immersed, apply between the conductor and the water the appropriate test voltage given in Table 3. Raise the voltage gradually and maintain it at the full value for 5 min. Table 3 Ð Voltage values for voltage test Type
Nominal cross-sectional area
Test voltage r.m.s.
mm2
V
AU
0.2 0.28 0.5
1 000 1 000 1 500
AK
0.22 0.5 0.75
1 000 1 500 2 000
12.2.3.2 Types BU, BR, BK, CU, CR and CK Immerse in water, for not less than 1 h, a sample between 10 m and 20 m in length. Earth the water. With the cable still immersed, apply an alternating voltage of 3 500 V between the conductor and the water. Raise the voltage gradually and maintain at the full value for 5 min.
12.2.4.2 Types AU and AK Immerse a sample, 5 m in length, in water for not less than 1 h. Allow a length of approximately 250 mm at each end of the sample to project above the water. Apply a d.c. voltage of between 80 V and 500 V between the conductors and the water. Measure the insulation resistance 1 min after application of the voltage. Present the value in terms of MV⋅km 12.2.4.3 Types BU, BR, BK, CU, CR and CK Immerse for 30 min a loosely coiled sample of the cable, between 5 m and 10 m in length, in water previously heated in accordance with 12.2.4.1. Apply a d.c. voltage of between 80 V and 500 V between the conductors and the water. Measure the insulation resistance 1 min after application of the voltage. Correct the value to MV⋅km 12.2.5 Long term resistance of PVC insulation to d.c. (for types BU, BR, BK, CU, CR and CK, see 12.1.2) Immerse a sample, approximately 5 m in length, in an aqueous solution of sodium chloride of approximately 10 g/l which has previously been raised to, and is maintained at, a temperature of (60 ± 5) 8C. Allow a length of approximately 250 mm at each end of the sample to project above the solution. Connect the negative pole of a 220 V d.c. supply to the conductor of the sample and the positive pole to a copper electrode immersed in the solution. Apply the voltage for a period of 10 days.
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BS 6231:1998
12.2.6 Thermal endurance (for types AU and AK, see 12.1.1) Wind a sample of cable, without undue tension, for four turns around and in contact with a metal mandrel, the diameter of which is approximately four times the maximum specified overall diameter of the cable. Maintain the assembly at (85 ± 2) 8C for not less than 1 000 h. Earth the mandrel and apply the test voltage given in Table 4 between the conductor and the mandrel continuously throughout the period. Cool the assembly to room temperature and apply the test voltage given in Table 3 between the conductor and the mandrel for a further period of not less than 5 min.
13 Durability of colours and marking Conformity to the requirements of 6.4 and 7.5 shall be checked by trying to remove the colours of the cables, the marking of the manufacturer's name or trade mark, and the designated temperature, by rubbing them lightly 10 times with a piece of cloth soaked in water.
14 Test under fire conditions Types BU, BR, BK, CU, CR and CK shall be tested in accordance with BS 4066-1 and -2, as applicable, and shall conform to the requirements of that standard.
Table 4 Ð Thermal endurance test voltage Test
Nominal cross-sectional area
Test voltage r.m.s
mm2
V
AU
0.2 0.28 0.5
750 750 1 000
AK
0.22 0.5 0.75
750 1 000 1 500
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BS 6231:1998
Table 5 Ð Types AU and AK PVC-insulated cables Construction Tinned annealed copper conductor Type AK 0.75 mm2 only: All other cables:
PVC insulation type TI 1; PVC insulation type 2
Colours Single colours Black, blue, brown, cream, green, grey, orange, pink, red, turquoise, violet, white, yellow Bi-colours Brown/blue, green/black, green/blue, green/brown, green/red, grey/blue, grey/brown, grey/green, grey/orange, grey/red, orange/black, orange/blue, orange/brown, orange/green, orange/red, red/black, red/blue, red/brown, white/black, white/blue, white/brown, white/green, white/grey, white/orange, white/red, white/violet, white/yellow, yellow/green, yellow/violet NOTE Base colours are indicated by bold type. Type
Conductor
Radial thickness of insulation
Nominal cross-sectional area
Number/ nominal diameter of wires, or class
Nominal
Minimum
mm2
mm
mm
mm
Mean overall diameter, upper limit
Minimum insulation resistance at 20 8C
mm
MV⋅km
AU
0.2 0.28 0.5
1/0.50 1/0.60 1/0.80
0.2 0.2 0.3
0.15 0.15 0.25
0.95 1.05 1.50
50 50 50
AK
0.22 0.5 0.75
class 5 class 5 class 5
0.2 0.3 0.6
0.15 0.25 0.50
1.05 1.65 2.45
50 50 10
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BS 6231:1998
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Table 6 Ð Types BU and BR PVC-insulated rigid cables Construction Plain annealed copper conductor PVC insulation type TI 1 Colours Single colours Black, blue, brown, grey, red, white, yellow Bi-colour Green/yellow (for earthing or similar protection, see 6.3) Type
Conductor
Radial thickness of insulation, mean value
Mean overall diameter, upper limit
Minimum insulation resistance at 70 8C
mm
mm
MV⋅km
Class
Nominal cross-sectional area mm2
BU
1.0 1.5 2.5
1 1 1
0.8 0.8 0.8
3.2 3.5 3.9
0.0142 0.0124 0.0103
BR
1.0 1.5 2.5 4 6 10 16 25 35 50 70 95 120 150 185 240
2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
0.8 0.8 0.8 0.8 0.8 1.0 1.0 1.2 1.2 1.4 1.4 1.6 1.6 1.8 2.0 2.2
3.3 3.6 4.2 4.8 5.4 6.8 8.0 9.8 11.0 13.0 15.0 17.0 19.0 21.0 23.5 26.5
0.0126 0.0114 0.0094 0.0078 0.0066 0.0064 0.0053 0.0051 0.0044 0.0044 0.0037 0.0036 0.0033 0.0033 0.0033 0.0032
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BS 6231:1998
Table 7 Ð Type BK PVC-insulated flexible cables Construction Tinned or plain annealed copper conductor PVC insulation type TI 1 Colours Single colours Black, blue, brown, grey, red, white, yellow Bi-colour Green/yellow (for earthing or similar protection, see 6.3) Type
Conductor
Radial thickness of insulation, mean value
Mean overall diameter, upper limit
Minimum insulation resistance at 70 8C
mm
mm
MV⋅km
Class
Nominal cross-sectional area mm2
BK
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0.5 0.75 1.0 1.5 2.5 4 6 10 16 25 35 50 70 95 120 150 185 240
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5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5
0.8 0.8 0.8 0.8 0.8 0.8 0.8 1.0 1.0 1.2 1.2 1.4 1.4 1.6 1.6 1.8 2.0 2.2
3.0 3.2 3.4 3.7 4.2 4.8 6.3 7.8 9.0 11.5 13.0 15.0 17.5 19.5 21.5 24.0 26.5 30.0
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0.0161 0.0141 0.0128 0.0111 0.0094 0.0077 0.0059 0.0058 0.0048 0.0047 0.0040 0.0039 0.0033 0.0032 0.0029 0.0029 0.0029 0.0028
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BS 6231:1998
Table 8 Ð Types CU and CR PVC-insulated rigid cables Construction Plain annealed copper conductor PVC insulation type TI 3 Colours Single colours Black, blue, brown, grey, red, white, yellow, orange, pink, violet, turquoise, green and cream Bi-colour Green/yellow (for earthing or similar protection, see 6.3). Conductor
Radial thickness of insulation mean value
Mean overall diameter, upper limit
Minimum insulation resistance at 90 8C
mm
mm
MV⋅km
Class
Nominal cross-sectional area mm2
CU
1.0 1.5 2.5
1 1 1
0.8 0.8 0.8
3.2 3.5 3.9
0.0142 0.0124 0.0103
CR
2.5 4 6 10 16 25 35 50 70 95 120 150 185 240
2 2 2 2 2 2 2 2 2 2 2 2 2 2
0.8 0.8 0.8 1.0 1.0 1.2 1.2 1.4 1.4 1.6 1.6 1.8 2.0 2.2
4.2 4.8 5.4 6.8 8.0 9.8 11.0 13.0 15.0 17.0 19.0 21.0 23.5 26.5
0.0094 0.0078 0.0066 0.0064 0.0053 0.0051 0.0044 0.0044 0.0037 0.0036 0.0033 0.0033 0.0033 0.0032
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Type
9
BS 6231:1998
Table 9 Ð Type CK PVC-insulated flexible cables Construction Tinned or plain annealed copper conductor PVC insulation type TI 3 Colours Single colours Black, blue, brown, grey, red, white, yellow, orange, pink, violet, turquoise, green and cream Bi-colour Green/yellow (for earthing or similar protection, see 6.3). Type
Conductor
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Minimum insulation resistance at 90 8C
mm
mm
MV⋅km
mm2
0.5 0.75 1.0 1.5 2.5 4 6 10 16 25 35 50 70 95 120 150 185 240
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10
Mean overall diameter, upper limit
Class
Nominal cross-sectional area
CK
Radial thickness of insulation, mean value
5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5
0.8 0.8 0.8 0.8 0.8 0.8 0.8 1.0 1.0 1.2 1.2 1.4 1.4 1.6 1.6 1.8 2.0 2.2
3.0 3.2 3.4 3.7 4.2 4.8 6.3 7.8 9.0 11.5 13.0 15.0 17.5 19.5 21.5 24.0 26.5 30.0
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0.0161 0.0141 0.0128 0.0111 0.0094 0.0077 0.0059 0.0058 0.0048 0.0047 0.0040 0.0039 0.0033 0.0032 0.0029 0.0029 0.0029 0.0028
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BS 6231:1998
Table 10 Ð List of tests applicable to the various types of cable Clause number
Test description
Table number 5
6
7
8
9
8 12.2.2 12.2.3.1 12.2.3.2 12.2.4.2 12.2.4.3 12.2.4.3 12.2.5 12.2.6
Electrical tests Conductor resistance Spark test Voltage test on cables types AU and AK Voltage test on cables at 3500 V Insulation resistance test at 20 8C Insulation resistance test at 70 8C Insulation resistance test at 90 8C Long term resistance of PVC insulation to d.c. Thermal endurance
X X X Ð X Ð Ð Ð X
X X Ð X Ð X Ð X Ð
X X Ð X Ð X Ð X Ð
X X Ð X Ð Ð X X Ð
X X Ð X Ð Ð X X Ð
10.1 11.1 11.2
Constructional and dimensional tests Check on construction Measurement of insulation thickness Measurement of overall diameter
X X X
X X X
X X X
X X X
X X X
Mechanical properties of insulation Tensile strength without ageing Elongation at break without ageing Cold bend test Cold elongation test Cold impact test Tensile strength after ageing in air Elongation at break after ageing in air Loss of mass test Hot deformation test Hot pressure test Heat shock test Thermal stability test at 200 8C Durability of colours and marking Test under fire conditions
X X X Ð Xa Xa Xa X Xb Xa X Ð X Ð
X X X X X X X X Ð X X Ð X X
X X X X X X X X Ð X X Ð X X
X X X X Ð X X X Ð X X X X X
X X X X Ð X X X Ð X X X X X
9.1
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13 14
NOTE ``X'' indicates that the particular test is applicable to the cables in the table shown at the head of the column. a
Type TI 1 insulation only
b
Type 2 insulation only
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11
BS 6231:1998
The electrical properties of PVC compounds are not adversely affected by low temperatures, but these compounds become increasingly stiff and brittle at temperatures about 0 8C. These cables should not be manipulated or left unsupported at these, or lower temperatures. It is recommended that the cables should be installed only when both the cable and the ambient temperature are above 0 8C and have been so for the previous 24 h, or where special precautions have been taken to maintain the cable above this temperature. Once installed, types AU and AK are suitable for use at a minimum ambient temperature of 215 8C and types BU, BR and BK at a minimum ambient temperature of 220 8C. These cables are suitable for use where the combination of ambient temperature and temperature rise due to load results in a conductor temperature not exceeding 70 8C. This is termed the designated temperature. Types CR, CU and CK cables, once installed, are suitable for a limited degree of movement at a minimum ambient temperature of 215 8C. They are suitable for use where the conductor temperature does not exceed the designated temperature of 90 8C. However, adjacent to high temperature zones, cables which are not subject to flexing or other mechanical stresses, are suitable for 15 000 h of cumulative operation at a temperature of 105 8C, provided that the direct contact temperature does not exceed 85 8C. In certain favourable conditions of service it may be possible to operate the cables for periods longer than 15 000 h, but attention should be paid to the following points: a) the possible effects of high temperature on the softening of insulation and on its dielectric properties, and b) some insulants can break down chemically after prolonged exposure to high temperatures. When this occurs, corrosive substances are formed, which attack the cable conductor or even the metal of nearby enclosures, especially if moisture from condensation is present when the circuit cools after normal operation.
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12
Bibliography BS 6004, PVC-insulated cables (non-armoured) for electric power and lighting. BS 6469-99:1992, Insulating and sheathing materials of electric cables Ð Part 99: Test methods used in the United Kingdom but not specified in BS EN 60811 or other Parts of BS 6469. BS 6500, Insulated flexible cords and cables.
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Annex A (informative) Guidance on installation and operating temperatures
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BS 6231:1998
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