IEC: 439 - 3 - 1990; Low-voltage switchgear and controlgear assemblies Part 3: Particular requiremets for assemblies for low-voltage switchgear and controlgear assemblies intended to be insstalled in places where unskilled persons have access for their use - distribution boards 

 - Geneva  IEC  1990 
 - 31p 
<br/><br/><label>Universal Decimal Class. No.: </label> /