UDC 621.316.351                         ETD 8

Reaffirmed 2017

1. Scope

1.1 This standard relates to ac interconnecting bus-bars and bus ducts (other than by cables) having rated voltage above 1 kV up to and including 36 kV, open or enclosed type which are part of ac electrical power systems and used as external connections between terminals of equipment. These are composed of metals such as conpper or aluminium with air, oil/compound, soild or semisolid materials as insulation. This standard also covers enclosures, support structure, etc, associated with bus-bars arrangement.

1.2 Insulators, bushings and cables, etc, which may be used with bus-bar assemblies are not covered in the standard.

1.3 This standard does not cover bus-bars forming part of factory built switchgear assemblies and also bus-bars used in outdoor switch yards.

1.4 The service conditions for which the bus-bars conforming to this standard are suitable are given in Appendix A.