IEC <br/><br/>
IEC: 60085(Ed-4.0)-2007-11; Electrical insulation-Thermal evaluation and designation 

 - 4 
 - Switzerland  IEC  2007 
 - 16+4 
<br/><br/> Printout taken from CD 
<br/><br/><label>Universal Decimal Class. No.: </label> /