Section 92(2) in The Indian Electricity Rules, 1956
(2)[ The earthing lead for any lightning-arrestor shall not pass through any iron or steel pipe, but shall be taken as directly as possible from the lightning-arrestor to a separate earth electrode and/or junction of the earth mat already provided for the high and extra-high voltage sub-station subject to the avoidance of bends wherever practicable.Note .-A vertical ground electrode shall be connected to this junction of the earth mat.] [[ Substituted by G.S.R. 1050, dated 22.10.1985 (w.e.f. 9.11.1985).
