§ 43.28. Lighting.
(a) While work is in progress, tunnels, stairways, ladderways, and all places on the surface where work is being conducted, shall be properly lighted. In shafts more than 100 feet deep the shaft below that point shall be lighted.
(b) All machinery in the area where persons are likely to be working or moving about shall be lighted so that the moving parts of the machinery are clearly distinguished.
(c) The exterior of the sockets of all fixed incandescent lamps, installed after June 13, 1922, shall be entirely nonmetallic.
(d) Lamp cord, when used for temporary lighting connections, shall have extra heavy insulation. Single portable lights shall be protected by a wire cage large enough to enclose both lamp and socket, and shall be provided with a handle to which the light and socket shall be firmly attached and through which the leading-in wires shall be carried.
(e) Incandescent lamps shall be placed so that they do not come in contact with combustible material, and so that an adequate circulation of air may take place on all sides of them.
(f) In all underground stations where a failure of electric light is likely to cause danger, lamps or other proper lights shall be kept ready for use.
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