IEC 60439-3 Amd.1 Ed. 1.0 b:1993

Amendment 1 - Low-voltage switchgear and controlgear assemblies. Part 3: Particular requirements for low-voltage switchgear and controlgear assemblies intended to be installed in places where unskilled persons have access for their use - Distribution boards

International Electrotechnical Commission , 10/15/1993