Low Voltage Systems Newsletter
The Low Voltage Switchgear & Controlgear
Assembly standards The move from IEC 60439-X to 61439-X Schneider Electric East Mediterranean Low Voltage Systems Newsletter Issue #1 - April 2011
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Low Voltage Systems Newsletter
Content The International ASSEMBLY Standards ................................... 2 From IEC 60439-1 to IEC 61439-1&2
Why a New Standard?....................................................................... 3 Clear Definitions of Roles ............................................................... 3 Elimination of TTA and PTTA Concepts .................................... 3 Clarified & Reinforced Requirements ......................................... 5 Strength of materials and parts
Overview of the Design Verifications ......................................... 5 (according to IEC 61439-2, in order of appearance)
Overview of the Routine Verifications ....................................... 6
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Low Voltage Systems Newsletter
The International ASSEMBLY Standards From IEC 60439-1 to IEC 61439-1&2 OLD IEC 60439-X LV switchgear & controlgear Assemblies (ASSEMBLIES)
NEW IEC 61439-X LV switchgear & controlgear Assemblies (ASSEMBLIES)
Power switchgear and controlgear assemblies TTA and PTTA (Also used as a general rules standard) 60439-1 Busbar Trunkings Systems 60439-2
Distribution Boards for unskilled pers. 60439-3
ASSEMLIES for construction sites 60439-4
ASSEMBLIES for public networks 60439-5
ASSEMBLIES for public networks 61439-5
Busbar Trunkings Systems 61439-6
General rules 61439-1 (2009) Power switchgear and controlgear assemblies 61439-2 (2009)
Distribution Boards for Ordinary pers. 61439-3
ASSEMLIES for construction sites 61439-4
• IEC 61439-2 is to be read in conjunction with IEC 61439-1, instead of IEC 60439-1 alone • Structure aligned with Standard for protection devices IEC60947 • Tests identical to those in IEC 60439-1 do not need to be repeat
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IEC61439-1 & 2 Standard
Low Voltage Systems Newsletter
Why a New Standard? • 80%
of the ASSEMBLIES worldwide do not comply with the standard
• Requirements not always clear • Role of Switchboard System manufacturer and Panel Builder not clear enough
• A Partially Type Tested ASSEMBLY (PTTA)
concept abused and misused
Main Changes
Original Manufacturer (Switchboard System manufacturer) and ASSEMBLY Manufacturer (Panel Builder) • PTTA/TTA concepts replaced with (tested) ASSEMBLY • Recognition of
• Clarified & reinforced requirements
Clear Definitions of Roles • ASSEMBLY Manufacturer (Panel Builder)
• Takes the responsibility for the final Assembly • Carries out routine verifications
• Original Manufacturer (System manufacturer) • Carries out the original design • Carries out the design verifications that can be certified through a certification body (ASEFA, ASTA, KEMA,…)
• ASSEMBLY System
Specifier Certification body
Original Manufacturer
Project Specification
Assembly system
• Full range of mechanical & electrical components (functional units, switching devices, enclosures…) designed by the Original Manufacturer to be assembled according to his instructions
Assembly Manufacturer (Panel Builder)
Tested assembly
User
• Specifier (design office, End user,…) • Specifies or selects the ASSEMBLY
Elimination of TTA and PTTA concepts Type Tested Assemblies Tested ASSEMBLIES Partially Type Tested Assemblies TTA
• 7 type tests on the design • 3 routine tests on the realization of each panel
PTTA
• Calculations not clearly defined to justify not to do some type-tests • 3 same routine tests
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Design verifications
• Mainly type-tests • Or possibility for only some of the verifications under clear and strict conditions to do • Comparison with a tested reference design (Design Rules) • Calculations including safety margins
Routine verifications
• Same as TTA in 10 items instead of 3
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IEC61439-1 & 2 Standard
Low Voltage Systems Newsletter
No.
1
2 3 4
Characteristic to be verified
Verification options available Clauses or Subclauses Verification Verification Verification by testing by calculation by design rules
Strength of Material and Parts:
10.2
Resistance to corrosion
10.2.2
Properties of Insulating Materials:
10.2.3
Thermal stability Resistance of insulating Materials to normal heat Resistance to abnormal heat and fire due to internal electric effects
Resistance to ultra-violet (UV) radiation Lifting Mechanical impact Marking Degree of Protection of Enclosures Clearance and Creepage Distances Protection against electric shock and integrity of protective circuits:
Yes
No
No
10.2.3.1
Yes
No
No
10.2.3.2
Yes
No
No
10.2.3.3
Yes
No
No
10.2.4 10.2.5 10.2.6 10.2.7 10.3 10.4
Yes Yes Yes Yes Yes Yes
No No No No No Yes
No No No No Yes Yes
Yes
No
No
Yes
Yes
Yes
10.5
Effective continuity between the exposed conductive parts of the ASSEMBLY and the 10.5.2 protective circuit Effectiveness of the assembly for external faults 10.5.3
5 6 7 8
9 10 11 12
Incorporation of switching devices and Components Internal electrical circuits and connections Terminal for external conductors Dielectric properties:
10.6
No
No
Yes
10.7 10.8 10.9
No No
No No
Yes Yes
Power-frequency withstand voltage
10.9.2
Yes
No
No
Impulse withstand voltage
10.9.3
Yes
Temperature-rise limits Short-circuit withstand strength Electromagnetic compatibility (EMC) Mechanical operation
10.10 10.11 10.12 10.13
Yes Yes Yes Yes
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Yes
Yes Yes No No
Yes Yes Yes No
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Low Voltage Systems Newsletter
Clarified & Reinforced Requirements: Strength of materials and parts • Following
tests are compulsory
This looks at the suitability of plastic and metal parts to prove the long term capabilities of the equipment.
• Resistance to corrosion • Properties of insulating materials • Thermal stability • Resistance of insulating materials to normal heat • Resistance to abnormal heat and fire due to internal electric effects • Resistance to ultra-violet (UV) radiation • Lifting • Mechanical impact (IK) • Marking
• Current carrying • All the tests (also short circuit) have to be made with the devices inside the assembly
• No more possibility to make a temperature rise with a heating resistance • No device substitution
• The tests have to be made
• for each circuit alone to its rated current • and the complete assembly (including diversity factor)
• The verification by calculation is limited
• maximum 1600A and all components de-rated to 80%
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Low Voltage Systems Newsletter
Overview of The Design Verifications (according to IEC 61439-2, in order of appearance) “Construction”
• Resistance to corrosion • Thermal stability of insulating materials (dry heat test) (a new ball pressure test will be withdrawn from Edition 2) • Resistance to abnormal heat due to internal electric effects (glow-wire test) (8) • UV radiation test (outdoor ASSEMBLIES only) • Lifting test • IK test, where specified • Marking • Degree of protection of enclosures (7) • Clearances (higher minimums) and creepage distances (5) • Continuity between exposed conductive parts and the protective circuit (4.1) • Effectiveness of the protective circuit for external faults (4.2) • Incorporation of switching devices and components • Internal circuits and connections • Terminals for external conductors
“Performance”
• Power-frequency voltage test (2) (complying with IEC60947) • Impulse withstand voltage test (no more optional) • Temperature rise limits (1) • Short-circuit withstand strength (3) • Electro-Magnetic Compatibility (9) • Mechanical operation (6) (200 operating cycles instead of 50)
NOTE • (1) to (7) show the 7 type-tests according to table 7 of IEC 60439-1 (items 1 to 7) • (8) and (9) were also required but not in table 7
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Low Voltage Systems Newsletter
Overview of The Routine Verifications Routine Verification
Visual inspection
Tests
Degree of protection of enclosures
X
Clearances
X
or measurement if specified values (in 1st Ed (2009) of IEC 61439 -1 these values are 1,5 times the values in Ed 2 to be published in 2011 (and in IEC 60439- 1) or impulse withstand voltage test
Creepage distances
X
or measurement if visual inspection not applicable
Protection against electric shock and integrity of protective circuits
X
Random verification of tightness of the connections of protective circuit
Incorporation of built-in components
X
Internal electrical circuits and connections
X
Terminals for external conductors Mechanical operation
Number, type and identification of terminals X
Dielectric properties Wiring, operational performance and function
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Or Random verification of tightness
X
effectiveness of mechanical actuating elements locks and interlocks, including those associated with removable parts Power-frequency dielectric test or verification of insulating resistance (with incoming up to 250A only) Verification of completeness of information & markings, inspection of wiring and Function test where relevant
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Low Voltage Systems Newsletter
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Low Voltage Systems Newsletter
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Schneider Electric East Mediterranean s.a.l.
Ashadia Building, 10th Floor, Tabaris, Achrafieh P.O. Box : 166223 - Beirut, Lebanon Tel. +961 1 204 502 Fax +961 1 204 458
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