Section 31 in The Static And Mobile Pressure Vessels (Unfired) Rules, 1981
31. Electrical apparatus and installations .-(1) No electrical wire shall pass over any storage vessel.
(2)All electrical wires installed within the safety zone or any storage vessel for the storage of flammable compressed gases shall consist of insulated cables of approved type. The cables shall be mechanically continuous throughout and effectively earthed away from the vessels.(3)For pump rooms used for pumping flammable compressed gases-(i)all electrical meters, distribution boards, switches, fuses, plugs and sockets shall be of flame proof construction complying with the requirements of IS : 2148 : 1968 and the frames shall be effectively earthed;(ii)all electrical fixed lamps shall be enclosed in a well glass flame proof fitting conforming to IS : 2206 (Part I) : 1962.(4)All electrical portable hand lamps shall be of a type approved by the Chief Controller.[31-A. Classification of hazardous area for flammable gases.-(1) A hazardous area for flammable gases shall be deemed to be-(a)a division "0" area, if inflammable gases of vapours are expected to be continuously present in the area;(b)a division "1" area, if inflammable gases or vapours are likely to be present in the area under normal operating conditions; or(c)a division "2" area, if inflammable gases or vapours are likely to be present in the area only under abnormal operating conditions or failure or rupture of an equipment.(2)If any question arises as to whether hazardous area is a division "0" area or a division "1" area or a division "2" area, the decision thereon of the Chief Controller shall be final.
