Overview of the main verification changes (IEC 61439 vs IEC 60439)

> Design verification

 

·         Increased requirements for insulating materials and transient overvoltages withstand tests.

·         Temperature rise verification:

ü  Verification by test of each functional unit loaded alone with its rated current

ü  Clear methods for the selection of representative samples of an Assembly system to be tested

ü  Test done in 4 steps: individual functional units, main and distribution busbars, and complete

Assembly

ü  Heating resistors only allowed to simulate circuits adjacent to a circuit under test

ü  Possible verification by comparison with a tested design under strict conditions, including derating

ü  Exemption of test (calculation) only allowed up to 1600 A instead of 3150 A under strict conditions,

including a 20% derating.

·         Possible short-cricuit withstand verification by comparison with a tested design under strict

condition

·         200 operating cycles instead of 50 for locking, interlocking and withdrawable parts

·         Lifting test (from IEC 62208)

·         Corrosion resistance test for metallic parts (from IEC 62208).

 

> Routine verification

 

ü  More detailed list of the verifications

ü  More severe requirements for clearances

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