IEC: 439 - 3 - 1990 (Amendment No.1 - 1993); 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 - disstribution boards 

 - Geneva  IEC  1993 
 - 15p 
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