What standard reference should we follow for selection of cables? 1. NEC 2.BS

Subclause.4 introduces minor changes with regard to busbar trunking systems and power track systems.- Subclause.6 introduces minor changes with regard to the sizing of cables where harmonic currents are present.

 BS: Incorporating Amendment3:. This affects all users and contains updates that are vital to ensuring the safety of installers and consumers alike.  

(The national electrical code ( nationally standard