International Electrotechnical Commission <br/><br/>
IEC: 61439-2 (Ed-2.0) - 2011-08 ; Low-voltage switchgear and controlgear assemblies - part 2 : power switchgear and controgear assemblies 

 - Geneva  IEC  2011 
 - 46 
<br/><br/> Downloaded from IEC website 
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