Abstract: An arc resistant switchgear assembly is provided having a front wall, a rear wall, a bottom surface, an upper surface, a first side wall, and a second side wall opposed to the first side wall and spaced a first distance from the first side wall, with each of the first and second side walls having an upper portion and a lower portion, and with each of the first and second side walls having an inner and an outer surface, with at least the lower portion of both the first side wall and the second side wall having at least one blow-off panel detachably secured thereto by fastening means. Each of the panels is detachably secured to the outer surface of the side wall to which each is secured. The assembly has a vertical plenum formed directly adjacent both the first and the second side walls, with the outer surface of each of the first and second side walls defining an inner side wall of each of the vertical plenums.

Abstract: A package envelope is provided with a plurality of interconnecting wall panels defining a plurality of expansion chambers which are inflatable to a predetermined pressure. At least one item-receiving zone is defined between at least one juxtaposed pair of the expansion chambers. The package includes means for releasably encapsulating an item within the item-receiving zone such that the item is supported against substantial lateral and rotational movement relative to the envelope even when the expansion chambers are not inflated to their predetermined pressure. A valve may be included for selectively controlling the flow of a filler medium, such as air, therethrough and into and out of the expansion chambers. When inflated, the expansion chambers substantially surround an item contained within each item-receiving zone.