Section 61(3) in The Indian Electricity Rules, 1956
(3)[ All metal casings or metallic coverings containing or protecting any electric supply-line or apparatus shall be connected with earth and shall be so joined and connected across all junction boxes and other openings as to make good mechanical and electrical connections throughout their whole length:Provided that where the supply of energy is at low voltage, this sub-rule shall not apply to isolated wall tubes or to brackets, electroliers, switches, ceiling fans or other fittings (other than portable hand lamps and portable and transportable apparatus) unless provided with an earth terminal and to Class-II apparatus/appliances:Provided further that where the supply of energy is at low voltage and where the installations are either new or renovated all plug sockets shall be of the three-pin types, and the third pin shall be permanently and efficiently earthed.Explanation .-The words "Class-II apparatus/appliance" will have the same meaning as assigned to these words in the relevant ISS.] [ Substituted by G.S.R. 256, dated 28.2.1983 (w.e.f. 26.3.1983).]
