Specification covers the design, manufacture, testing at works and supply of Distribution Boxes made out of CRCA MS for controlling the L. side of Distribution Transformers. 63 VA V 8623 (amended upto date) – for general requirement of me d upto date) – Glass Reinforced in ion arrangement etc le pole Isolator (Switch Disconnector), conforming to. 4 KV Substation of the ratings indicated above. The body of the boxes shall have sufficient re- enforcement with suitable size of channels keeping a provision for fixin andle conforming to general. In a newly constructed residential area, a 10kV power line is introduced into the substation. 4kV), power distribution is achieved through three levels of distribution boxes: the main distribution board, secondary. What do the primary, secondary, and tertiary boxes of a distribution box mean? This is a relative issue. 3 phase, 4 wire, 433 V, 50 HZ with effectively grounded neutral. Dimensions included are length, width.