Abstract: The device includes a support member; a casing; and a closing and covering member. The support member may be attached to an external member and may receive an electrical mechanism. The support member is provided with a coupling mechanism to the casing and this coupling allows access of conductors from a raceway device. The casing is prismatic in shape and is adapted to surround the support member and the electrical mechanism. The casing is provided with a bight in one side wall thereof. The closing and covering member has a wall portion and a hood portion. The wall portion may be attached to the edges of the bight to close it. The hood portion covers a portion of the raceway device. Where necessary, a guide member is attached to a portion of the raceway device and is covered by the hood portion.

Abstract: The member or box includes: a slot under which ribs of the tray may be received and which has passages on one side and an aperture on the other side; a retaining member attached to the slot and which is provided with a fold-down tab and a tooth; fingers resiliently attached to the base portion and provided with teeth inserted through the passages and which may retain a rib; and resilient bridges extending on a higher plane above the base portion and facing the tab. The retaining member is movable between a normal inactive position and an active position in which the tooth is inserted through the aperture, retaining one of the free ends of the rib and the bridges retain the fold-down tab.

Abstract: A device for joining trays includes a transverse portion and a sheetlike buttstrap. The transverse portion is flush with a transverse end edge of a lid section of a tray and engages the side walls of a base section of the tray by end walls which may be provided with projections or with hook-shaped legs. The transverse portion has retaining holes and is provided with a center tab extending longitudinally and which is covered by the lid section. The sheetlike buttstrap covers the transverse portion of the device and the part of the lid section covering the center tab. The sheetlike buttstrap is provided with resilient protuberances mating with the retaining holes.

Abstract: An integral box attached to harpoon-shaped projections in the bottom of a channel-like duct member for electrical wiring by way of a fixed appendage and a pivotable locking tab. The latter has a lower portion extending below the base of the box and an upper portion. The lower portion is provided with a retaining appendage for a harpoon-shaped projection and the upper portion is provided with a locking mechanism.