International Electrotechnical Commission <br/><br/>
IEC: 61439-6(Ed-1.0)- 2012-05; Low - Voltage switchgear and controlgerar assemblies - part 6: Busbar trunking systems (Busways) 

 - Geneva  IEC  2010 
 - 85 
<br/><br/> Downloaded from IEC website 
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