Importance

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Abstract

An explosion proof power supply enclosure for hazardous atmosphere lighting systems having multiple, identical explosion proof inlet and outlet openings to handle both high voltage AC circuits and low voltage DC intrinsically safe circuits. Each enclosure has thick, flat metal plate end walls and a plurality of identical circular openings located side-by-side in such walls. Each opening has an internal smooth walled surface configuration defining one side of a flame-quenching path. For AC power connections, explosion-proof receptacles are fitted in some of the openings with each receptacle having external surface configurations that define the other side of the flame quenching path. For intrinsically safe circuit conductors, other openings are fitted with adaptors having identical external surface configurations defining flame quenching paths and the adaptors have a variety of electrical and mechanical mechanisms controlling access to the enclosures; three examples of such mechanisms are given as a solid plug, intrinsically safe receptacles and a switch actuating plunger.

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First Claim