Section 51(1)(c) in The Indian Electricity Rules, 1956
(c)Every [*] [ The word " main" omitted by G.S.R. 170, dated 15.1.1979 (w.e.f. 3.2.1979).]switchboard shall comply with the following provisions, namely:-(i)a clear space of not less than 1 metre in width shall be provided in front of the switchboard;(ii)if there are any attachments or bare connections at the back of the switchboard, the space (if any) behind the switchboard shall be either less than 20 centimetres or more than 75 centimetres in width, measured from the farthest outstanding part of any attachment or conductor;(iii)if the space behind the switchboard exceeds 75 centimetres in width, there shall be a passage-way from either end of the switchboard clear to a height of 1.8 metres.