Bureau of Indian Standards <br/><br/>
IS: 2026(Part 3) - 2009; Power Transformers. Part :3 Insulation Levels, Dielectric Tests and External Clearances in Air (IS 2026: part 3 2009) RA. 2011 

 - 3 
 - Bangalore  BIS  2009 
 - 48 
<br/><br/><label>Universal Decimal Class. No.: </label> /