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7/29/2019 LV assemblies
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IEC 61439
The new Standard for Low-Voltage Switchgear Assemblies
Changes and Effects in respect of Tests
Author: GE Ronald BorchertIPH Berlin
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IEC 61439
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IEC 61439
The new structureFor the new re-structured IEC61439 series the following parts areenvisaged:
IEC TR 61439-0: Specification Guide for Low-Voltage Switchgear andControlgear ASSEMBLIES
IEC 61439-1: General rulesIEC 61439-2: Power switchgear and controlgearASSEMBLIES(PSC ASSEMBLIES)
IEC 61439-3: Distribution boards (to supersede IEC 60439-3)IEC 61439-4: ASSEMBLIES for construction sites (to supersede IEC 60439-4)
IEC 61439-5: ASSEMBLIES for power distribution (to supersede IEC 60439-5)
IEC 61439-6: Busbar trunking systems (to supersede IEC 60439-2)
This list is not exhaustive; additional parts may be developed as the need
arises.
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IEC 61439
Objectives of the new re-structured standard
Splitting of IEC 60 439-1 into 2 parts:
General rules
Power switchgear assemblies (1st product part)
Disappearance of categories TTA und PTTA
Revision of the present content
(consequential order, more clearly defined requirements)
Different but equivalent options to verify an assembly(Testing / Calculation / Physical measurement or the
validation of design rules)
Take-over of requirements from the standard for emptyenclosures (IEC 62208 / VDE 0660 T511)
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IEC 61439
Contents
2 Normative references
3 Terms and definitions
4 Symbols and abbreviations
5 Interface characteristics
6 Information
7 Service conditions
8 Constructional requirements
1 Scope
9 Performance requirements
10 Design verification
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IEC 61439
Contents
A to M Normative and informative appendices
Bibliography
Tables 1 to 14
11 Routine verification
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IEC 61439
8 Constructional requirements
8.2 Degree of protection provided by an ASSEMBLY enclosure
8.3 Clearances and creepage distances
8.4 Protection against electric shock
8.5 Incorporation of switching devices and components
8.6 Internal electrical circuits and connections
8.7 Cooling
8.8 Terminals for external conductors
8.1 Strength of materials and parts
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IEC 61439
9 Performance requirements
9.2 Temperature-rise limits (Table 6)
9.3 Short-circuit protection and short-circuit withstand strength
9.4 Electromagnetic compatibility (EMC)
9.1 Dielectric properties
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IEC 61439
10 Design verification
10.2 Strength of material and parts
10.2.1 General
10.2.2 Resistance to corrosion
10.2.3 Properties of insulating materials
10.2.3.1 Verification of thermal stability of enclosures
10.2.3.2 Verification of resistance of insulating materials to normal heat10.2.3.3 Verification of resistance of insulating materials to abnormal
heat and fire due to internal electric effects
10.1 General
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IEC 61439
10 Design verification
10.2.5 Lifting
10.2.6 Mechanical impact (IK-Code)
10.2.4 Resistance to ultra-violet (UV) radiation
10.2.7 Marking
10.3. Degree of protection of ASSEMBLIES
10.4. Clearances and creepage distances
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IEC 61439
10 Design verification
10.5 Protection against electric shock and integrity of protective
circuits10.5.1 Effectiveness of the protective circuit
a) against the consequences of a fault within the ASSEMBLY as
outlined in 10.5.2b) against the consequences of faults in external circuits
supplied through the ASSEMBLY as outlined in 10.5.3
10.6 Incorporation of switching devices and components
10.7 Internal electrical circuits and connections
10.8 Terminals for external conductors
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IEC 61439
10 Design verification
10.9 Dielectric properties
10.10 Verification of temperature rise
10.11 Short-circuit withstand strength
10.12 Electromagnetic compatibility (EMC)
10.13 Mechanical operation
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IEC 61439
Summary
No. Characteristic to be verified Clauses
Verification options available
Testing Calculation Design rules
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 heat10.2.3.2 YES NO NO
Resistance of insulating materialsto abnormal heatand 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
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IEC 61439
Summary
No. Characteristic to be verified Clauses
Verification options available
Testing Calculation Design rules
2Degree of protection ofenclosures
10.3 YES NO YES
3Clearances and creepagedistances
10.4 YES NO YES
4Protection against electricshock and integrity ofprotective circuit
10.5 - - -
Effective continuity betweenthe exposed conductive parts
of the ASSEMBLY and theprotective circuit
10.5.2 YES NO NO
Effectiveness of theASSEMBLY for external faults
10.5.3 YES YES YES
5Incorporation of switchingdevices and components
10.6 NO NO YES
6Internal electrical circuits andconnections
10.7 NO NO YES
7Terminals for externalconductors
10.8 NO NO YES
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IEC 61439
Summary
No. Characteristic to be verified ClausesVerification options available
Testing Calculation Design rules
8 Dielectric properties 10.9 - - -
Power-frequency withstandvoltage
10.9.2 YES NO NO
Impulse withstand voltage 10.9.3 YES NO YES
9 Temperature-rise limits 10.10 YES YES YES
10Short-circuit withstandstrength
10.11 YES YES YES
11Electromagnetic compatibility
(EMC)10.12 YES NO YES
12 Mechanical operation 10.13 YES NO NO
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IEC 61439
Thank you for your attentionGE Ronald Borchert
Senior Engineer of Low-Voltage Test Laboratory
Telephone 0049 30 54960330
Telefax 0049 30 54960402
Mobile 0049 176 15496013
Email [email protected]
Institut "Prffeld fr elektrische Hochleistungstechnik" GmbH
Landsberger Allee 378A D-12681 Berlin, Germany
http://www.iph.de
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IEC 61439
3.10 Manufacturer
3.10.1 Original ManufacturerOrganisation that has carried out the original design and theassociated verificaton of an ASSEMBLY in accordance with this
standard.
3.10.2 ASSEMBLY ManufacturerOrganisation taking the responsibility for the completedASSEMBLY.
Note: The ASSEMBLY manufacturer may be a different organisation to theOriginal Manufacturer.
3 Terms
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IEC 61439
8.1.1 General
8.1.2 Protection against corrosion
8.1.3 Thermal stability
8.1.4 Resistance to ultra-violet radiation
8.1.5 Resistance of insulating materialsto heat and fire
8.1.6 Mechanical strength8.1.7 Lifting provision
8.1 Strength of materials and parts
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IEC 61439
8.2.1 Protection against mechanicalimpact
8.2.2 Protection against contact with
live parts, ingress of solid foreignbodies and liquids
8.2.3 Degree of protection of removableparts
8.2 Degree of protection provided by an ASSEMBLY enclosusure
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IEC 61439
8.3.1 General
8.3.2 Clearances
8.3.3 Creepage distances
8.3 Clearances and creepage distances
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IEC 61439
8.4.1 General8.4.2 Basic protection
(against direct contact with hazardous live parts by insulation,
barriers or enclosures)
8.4.3 Fault protection (Protective measures:Protective conducter, Electrical separation or Protectionby total insulation)
8.4.4 Limitation of steady state touchcurrent and charge
8.4.5 Operating and servicing conditions(Accessibility, Obstacles against unintentional bodily approach
or contact to live parts)
8.4 Protection against electric shock
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IEC 61439
8.5.1 Fixed parts8.5.2 Removable parts8.5.3 Selection of switching devices and
components8.5.4 Installation of switching devices and
components8.5.5 Accessibility
8.5.6 Barriers8.5.7 Direction of operation and indicationof switching positions
8.5.8 Indicator lights and push-buttons
8.5 Incorporation of switching devices and components
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IEC 61439
8.6.1 Main circuits
8.6.2 Auxiliary circuits8.6.3 Bare and insulated conductors8.6.4 Selection and installation of non-
protected live conductors to reduce thepossibility of short-circuits
8.6.5 Identification of the conductors of mainand auxiliary circuits
8.6.6 Identification of the protective conductor(PE, PEN) and of the neutral conductor(N) of the main circuits
8.6 Internal electrical circuits and connections
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IEC 61439
9.1.1 General
9.1.2 Power-frequency withstand voltage9.1.3 Impulse withstand voltage
9.1.4 Protection of surge protective devices
9.1 Dielectic properties
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IEC 61439
9.3.1 General
9.3.2 Information concerning short-circuitwithstand strength
9.3.3 Relationship between peak current andshort-time current9.3.4 Co-ordination of protective devices
9.3 Short-circuit protection and short-circuit withstand strength
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IEC 61439
J.9.4.1 GeneralEnvironment A (non-public or industrial networks)
Environment B (public networks such as domestic comercialand light industrial locations)
J.9.4.2 Reqirement for testingNo EMC immunity or emission tests are required on finalASSEMBLIES if:
a) The incorporated Components are in compliance with therequirements for EMC for the stated environments(J.9.4.1) and
b) The internal installation and wiring is carried out in
accordance with the instructions of the devices andcomponents manufacturers
J.9.4.3 ImmunityJ.9.4.4 Emission
J.9.4 Electromagnetic compatibility (EMC)
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IEC 61439
Where an empty enclosure acc. to IEC 62208 isused, and it has not been modified so as to degradethe performance of the enclosure, no further testingof enclosure to 10.2 is required:
10.2.2.2 Severity test A (damp heat cycling)- metallic indoor enclosures
- external metallic parts of indoor Assemblies
- internal metallic parts of indoor and outdoor Assemblies onwhich the mechanical operation depend
10.2.2.3 Severity test B (damp-heat cyclingand salt mist)- metallic outdoor enclosures
- external metallic parts of outdoor Assemblies
10.2 Strength of materials and parts
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IEC 61439
10.2.3.1 Verification of thermal stability ofenclosuresHeat ageing with dry heat at 70C during 168h (IEC 60068-2-2)
10.2.3.2 Verification of resistance of insulating
materials to normal heatHeat ageing with dry heat followed by ball-pressure test(IEC 60695-2-10)
10.2.3.3 Verification of resistance of insulatingmaterials to abnormal heat and fire
Glow-wire test (IEC 60695-2-10 und -11)
10.2 Strength of materials and parts
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IEC 61439
10.2.4 Resistance to ultra-violet (UV) radiation
UV test acc. to ISO 4892-2 method A
This test applies only to enclosures and external parts ofASSEMBLIES intended to be installed outdoors and which are
made of synthetic materials or coated by them
10.2.5 Lifting
10.2.6 Mechanical impactacc. to IEC 62262
10.2 Strength of materials and parts
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IEC 61439
10.2.7 Markings
Rubbing the marking by hand with a cloth soaked with petroleumspirit.
Markings made by moulding, pressing, engraving or similar areexempt from this test.
10.2 Strength of materials and parts
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IEC 61439
Where an empty enclosure in accordance withIEC 62208 is used, and no external modificationhas been carried out that may result in a
detoriation of the degree of protection, no furthertesting is required.Otherwise, the degree of protection shall beverified acc. to IEC 60529.
10.3 Degree of protection of enclosures
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IEC 61439
Minimum values determined in 8.3 in reference tothe tables 1 and 2 respectively. The measuringmethod as per description in annex F.
10.4 Clearances and creepage distances
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IEC 61439
10.5.2 Effective earth continuity between theexposed conductive parts of theASSEMBLY and the protective circuit(consider the internal fault)
Resistance measurement
10.5.3 Short-circuit withstand strength of theprotective circuit (consider the external fault)
E.g. test acc. to 10.11.5.6 between the terminal for the incomingprotective conducter and the terminal for each relevant outgoingprotective conductor against the nearest phase conductorterminals.
10.5 Protection against electric shock and integrity of protection
circuits
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IEC 61439
Compliance with the design requirements of 8.5.and the performance requirements of J.9.4 forelectromagnetic compatibility shall be confirmed
by inspection and verified to the requirements tothis standard.
Non other than the (original) manufacturer isable to provide this evidence.
10.6 Incorporation of switching devices and components
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IEC 61439
Compliance with the design requirements of 8.6.shall be confirmed by inspection and verified tothe requirements to this standard.
Non other than the (original) manufacturer isable to provide this evidence.
10.7 Internal electrical circuits and connections
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IEC 61439
Compliance with the design requirements of 8.8shall be confirmed by inspection.
Non other than the (original) manufacturer isable to provide this evidence.
10.8 Terminals for external conductors
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IEC 61439
10.9.2 Power-frequency withstand voltage
Test voltages acc. to tables 8 or 9 resp.
10.9.3 Impulse withstand voltage
Test voltages acc. to table 10,Alternative tests with AC oder DC are possible(10.9.3.3 or 10.9.3.4 resp.)
10.9.4 Testing of enclosures made of insulating
materialFor this additional test the voltage shall be equal to 1.5 times thevalues indicated in table 8,Metal foil laid on the outside of the enclosure
10.9 Dielectric properties
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IEC 61439
10.10.2 Verification by testing with current
1) If the ASSEMBLY to be verified comprises a number of variants, the mostonerous arrangement(s) of the ASSEMBLY shall be selected by theOriginal Manufacturer acc. to 10.10.2.2..
2) The ASSEMBLY shall be verified by one of the following methods, determinedby the Original Manufacturer :
a) Considering individual functional units, the main and distribution busbarsand the ASSEMBLY collectively acc. to 10.10.2.3.5
b) Considering individual functional units separately and the completeASSEMBLY including the main and distribution busbars acc. to 10.10.2.3.6
c) Considering individual functional units and the main and distributionbusbars separately as well as the complete ASSEMBLY acc. to10.10.2.3.7
10.10 Verification of temperature rise
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IEC 61439
10.11.5 Verification by test
Circuits shall be tested with the highest thermal and dynamic stresses that mayresult from short-circuit currents up to the rated values for one or more of thefollowing conditions as declared by the Original Manufacturer:
a) Not dependent upon a SCPD:
Test with Ipk und Icw for the specified duration
b) Dependent upon an incoming SCPD included within the ASSEMBLY:
Test with an incoming Icc for a period time that is limited by the incoming SCPD
c) Dependent upon an upstream SCPD:Test with the let-through values permitted by the upstream SCDP as defined by
the Original Manufacturer.
10.11 Short-circuit withstand strength
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IEC 61439
Each type of circuit shall be subject to a short-circuit test. There are:
10.11.5.3.2: Outgoing circuits
10.11.5.3.3: Incoming circuits and main busbars
10.11.5.3.4: Connections to the supply side of outgoing units that do not fulfil
the requirements of 8.6.4 (Selection and installation of non-protected live conductors).
10.11.5.3.5: Neutral conductorThe value of the test current shall be at least 60 % of the phasecurrent during the three-phase test.
10.11.5.6 Protective circuitsEach outgoing unit on test shall be fitted with its intendedprotective device. The value of the test current shall beat least 60 % of the phase current during the three-phase test.
10.11 Short-circuit withstand strength
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IEC 61439
J.10.12.1 Immunity tests
J.10.12.1.1 ASSEMBLIES not incorporating electronic circuits
No tests are necessary
J.10.12.1.2 ASSEMBLIES incorporating electronic circuits
Tests shall be made acc. to the relevant environment A or B. Thevalues are given in tables J.3 and/or J.4Performance criteria shall be stated by the ASSEMBLYmanufacturer based on the acceptance criteria in table J.5.
10.12 Electromagnetic compatibility (EMC)
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IEC 61439
J.10.12.2 Emission tests
J.10.12.2.1 ASSEMBLIES not incorporating electronic circuits
No tests are necessary
J.10.12.2.2 ASSEMBLIES incorporating electronic circuits
Frequencies > 9 kHz: Tests shall be made acc. to the relevant environmentA or B. The values are given in tables J.1 and/or J.2
Frequencies < 9 kHz: Compliance with the requirements ofIEC 61000-3-2 where applicable.
Performance criteria shall be stated by the ASSEMBLY manufacturer based onthe acceptance criteria in table J.5.
10.12 Electromagnetic compatibility (EMC)
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IEC 61439
This verification test shall not be made on such devices of the ASSEMBLY whichhave already been type tested according to their relevant product standard unlesstheir mechanical operation is impaired by their mounting
Testing: 200 operating cycles
At the same time, the operation of the mechanical interlocks associated with thesemovements shall be checked.
10.13 Mechanical operation
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