Abstract: An engine enclosure includes a frame, multiple roof panels, and multiple retainer assemblies. The roof panels are disposed on the frame and include one or more threaded receptacles. The retainer assemblies are configured to releasably secure the roof panels to the frame. The retainer assemblies include a clamp, and a threaded fastener. The clamp includes a first portion and a second portion. The first portion is disposed adjacent to the frame. The second portion is substantially offset from the first portion and includes an aperture. The threaded fastener is disposed within the aperture and releasably fastened to the threaded receptacle.

Abstract: An improved rating plug housing is presented for use with circuit breakers having electronic trip units. The housing (10) for the rating plug has a series of protruding tabs (14) on the bottom of the housing (10). A trip unit housing (50) forms part of a circuit breaker housing. Trip unit housing (50) includes a recess (52) for receiving the trip unit housing (10). Recess (52) has a series of castellations (54) on the bottom of the recess (52). If a rating plug is appropriate for a given trip unit, the pattern of tabs (14) and castellations (54) will not interfere, and insertion will be permitted. If a rating plug is not appropriate for a given trip unit, the pattern of tabs (14) and castellations (54) will interfere, and insertion will not be permitted. Tabs (14) or projections (53) may be removed from housing (10) or recess (52) using a hand-held tool.