IEC 60439-1 Ed. 4.1 b:2004, Low-voltage switchgear and controlgear assemblies - Part 1: Type-tested and partially type-tested assemblies

Applies to low-voltage switchgear and controlgear assemblies (type-tested assemblies (TTA) and partially type-tested assemblies (PTTA)), the rated voltage of which does not exceed 1 000 V a.c. at frequencies not exceeding 1 000 Hz, or 1 500 V d.c.