International Electrotechnical Commission <br/><br/>
IEC/TS: 62271-304; Technical Specification; High-voltage switchgear and controlgear part 304: Design classes for indoor enclosed switchgear and controlgear for rated volatages above1kV up to and including 52 kV to be used in severe climatic conditions 

 - 1.0 
 - Geneva  International Electrotechnical Commission  2008 
 - 11/08/2009 
<br/><br/><label>Universal Decimal Class. No.: </label> /