IEC: 439-3 - 1990 (Amendt. No.2 - 1993); Low-voltage switchgear and controlgear assemblies Part 3 - particular requirements for low-voltage swithger and controlgear assmblies intended to be installed in places where unskilled persons have access for thier use-distribution boards 

 - Geneva  IEC  1993 
 - 5p 
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