This document provides specifications for various distribution boxes including dimensions, mounting sizes, and number of ways. Wiring diagram shows both PNP and NPN wiring. Dimensions are shown in mm (in. Low-voltage fixed switchgear GGD series: Mainly used in power industries such as substations and power plants, with high breaking. 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. compact connectivity solution that can be installed quickly and easily in the field. 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.