Section 37(2)(g) in The Indian Electricity Act, 1910
(g)for the purposes of electric traction regulate the employment of in-sulated returns, or of uninsulated metallic returns of low resistance, in order to prevent fusion or injurious electrolytic action of or on metallic pipes, structures or substances, and to minimise, as far as is reasonably practicable, injurious interference with the electric wires, supply-lines and apparatus of parties other than the owners of the electric traction system, or with the currents therein, whether the earth is used as a return or not;