Section 51(1)(d) in The Indian Electricity Rules, 1956
(d)[ In case of installations provided in premises where inflammable materials including gases and/or chemicals are produced, handled or stored, the electrical installations, equipment and apparatus shall comply with the requirements of flame proof, dust tight, totally enclosed or any other suitable type of electrical fittings depending upon the hazardous zones as per the relevant Indian Standard Specifications.] [ Inserted by G.S.R. 529, dated 1.7.1986 (w.e.f. 19.7.1986).]