| 主权项 |
1. An arc resistant air vent for an electrical enclosure comprising:
a) a plenum enclosure built to withstand rupture during an arc blast, with an open front wall and an open back wall, and side walls arranged to accept and support corrugated baffle plates; b) a grille covering the open front wall of the plenum, c) a stack of baffle plates in the plenum being corrugated plates stacked in a spaced relationship, each plate having a plurality of perforations along each ridge and furrow of the corrugations, and each ridge or furrow, or both, having an attachment tab at both sides for connection with a corresponding side wall of the plenum to maintain the spaced relationship normally but which are too weak to maintain connection integrity under a force produced by an arc blast; d) with one of the uppermost or lowermost plates being an outside plate and ending in an extended fold toward the back wall of the plenum capable of contacting the last fold of an opposite outside plate in the stack when bent towards the front wall; and e) whereby the perforations and tabs produce an accordion hinge to allow a folding of the plates together under the force of an arc blast in the switchgear cabinet. |
