CLAMPING ADJUSTMENT FEATURE FOR BUS DUCT HOUSING

摘要

A two-part housing for a plug-in bus duct having longitudinally extending corrugations in the opposite sidewalls cooperatively supporting a plurality of spaced insulated bus bars along their opposite edges. Upper and lower walls of each housing part meet in overlapped relationship and are secured together by longitudinally spaced screws which extend through slotted or exaggerated clearance holes in one wall to thread into alined extruded holes in the other wall, the clearance holes providing inward adjustment of the housing parts during tightening of the screws to provide intimate contact between bus bars and sides for maximum heat dissipation regardless of tolerance conditions. An alternative construction includes a ground bus bar adjacent the overlapped lower walls with clearance holes in each wall and the screws threading into alined holes in the ground bar to position the bar and provide for added electrical continuity from bar to housing as well as secure the housing.