Section 50A(4) in The West Bengal Factories Rules, 1958
(4)The type and the lay out of electrical apparatus to be used, and the method of electrical wiring, in any part of a factory in which any substance likely to induce ignitable or explosive mixture is used or stored, shall be subject to the approval of the Chief Inspector.Explanation: "Apparatus" includes all apparatus,machines and fittings in which conductors are used, or of which they form parts.
