Assembly standards - Schneider Electric

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
www.eastmed.schneider-electric.com
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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)
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
NEW IEC 61439-X
LV switchgear
& controlgear
Assemblies
(ASSEMBLIES)
Power switchgear
and controlgear
assemblies
61439-2 (2009)
Distribution
Boards for
Ordinary pers.
61439-3
General rules
61439-1 (2009)
ASSEMLIES
for construction
sites
61439-4
ASSEMBLIES
for public
networks
61439-5
Busbar
Trunkings
Systems
61439-6
• 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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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
• Recognition of Original Manufacturer (Switchboard System manufacturer)
and ASSEMBLY Manufacturer (Panel Builder)
• PTTA/TTA concepts replaced with (tested) ASSEMBLY
• 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
• Full range of mechanical & electrical components
(functional units, switching devices, enclosures…)
designed by the Original Manufacturer to be
assembled according to his instructions
• Specifier (design office, End user,…)
• Specifies or selects the ASSEMBLY
Certification
body
Original
Manufacturer
IEC61439-1 & 2 Standard
Assembly
system
Elimination of TTA and PTTA concepts
Specifier
Project Specification
Assembly
Manufacturer
(Panel Builder)
Tested assembly
User
Type 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
Tested ASSEMBLIES
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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Low Voltage Systems Newsletter
IEC61439-1 & 2 Standard
No.
Characteristic to be verified
Clauses or
Subclauses
Verification
by testing
Verification options available
Verification
by calculation
1 Strength of Material and Parts: 10.2
Resistance to corrosion 10.2.2 Yes No No
Properties of Insulating Materials: 10.2.3
Thermal stability 10.2.3.1 Yes No No
Resistance of insulating
Materials to normal heat
10.2.3.2 Yes No No
Resistance to abnormal heat and fire due to
internal electric effects
10.2.3.3 Yes No No
Resistance to ultra-violet (UV) radiation 10.2.4 Yes No No
Lifting 10.2.5 Yes No No
Mechanical impact 10.2.6 Yes No No
Marking 10.2.7 Yes No No
2 Degree of Protection of Enclosures 10.3 Yes No Yes
3 Clearance and Creepage Distances 10.4 Yes Yes Yes
4 Protection against electric shock
and integrity of protective circuits:
10.5
Effective continuity between the exposed
conductive parts of the ASSEMBLY and the 10.5.2 Yes No No
protective circuit
Effectiveness of the assembly for external faults 10.5.3 Yes Yes Yes
5 Incorporation of switching devices
and Components
10.6 No No Yes
6 Internal electrical circuits and connections 10.7 No No Yes
7 Terminal for external conductors 10.8 No No Yes
8 Dielectric properties: 10.9
Power-frequency withstand voltage 10.9.2 Yes No No
Impulse withstand voltage 10.9.3 Yes Yes
9 Temperature-rise limits 10.10 Yes Yes Yes
10 Short-circuit withstand strength 10.11 Yes Yes Yes
11 Electromagnetic compatibility (EMC) 10.12 Yes No Yes
12 Mechanical operation 10.13 Yes No No
Verification
by design
rules
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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 1 st 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
Incorporation of built-in components
X
X
Random verification of tightness of the connections of
protective circuit
Internal electrical circuits and connections X Or Random verification of tightness
Terminals for external conductors
Number, type and identification of terminals
Mechanical operation X effectiveness of mechanical actuating elements
locks and interlocks, including those associated with
removable parts
Power-frequency dielectric test or verification of
Dielectric properties
insulating resistance (with incoming up to 250A only)
X
Verification of completeness of information & markings,
Wiring, operational performance and function
inspection of wiring and Function test where relevant
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Low Voltage Systems Newsletter
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Low Voltage Systems Newsletter
To find out more:
www.eastmed.schneider-electric.com
Schneider Electric East Mediterranean s.a.l.
Ashadia Building, 10 th Floor, Tabaris, Achrafieh
P.O. Box : 166223 - Beirut, Lebanon
Tel. +961 1 204 502
Fax +961 1 204 458
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Cyprus + 357 24 812 649 • customercare.cy@schneider-electric.com
Iraq + 962 6 516 6260 • customercare.iq@schneider-electric.com
Jordan + 962 6 516 6465 • customercare.jo@schneider-electric.com
Lebanon + 961 1 321 645 • customercare.lb@schneider-electric.com
Syria + 963 11 6124799 • customercare.sy@schneider-electric.com
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