Abstract: A reducing joint assembly which, when attached at one end thereof to a bus duct having a predetermined number of runs and at the other end thereof to a bus duct having a different number of runs, allows interconnection of these non-matching ducts without undue wasted length or materials. The reducing joint assembly includes one conventional single bolt coupler at each end thereof for each run to be connected at that respective end of the assembly. Connected between the respective single bolt couplers is a single reducer plate for each phase of the bus duct system. Each such reducer plate has tabs at each end, one for each single bolt coupler, so that the reducer plates in effect interconnect with the single bolt coupler in generally the same manner as do the bus plates of each bus duct. The apparatus also includes specialized joint covers for covering the joint thus created to prevent the entry of foreign objects.

Abstract: A plurality of wide flat bus bars (A,B,C,N) stacked in flat face-to-face relation are clamped against separation forces of short circuit currents in the bus bars by U-shaped reinforcement channels (6,14) disposed over opposite edges of the bus bars with bight portions (6a,14a) of said channels abutting the edges of the bus bars and leg portions (6b,14b) thereof extending along flat surfaces of outer ones of said bus bars. A plurality of bolts (8) through aligned holes in outwardly directed flanges (6c,14c) formed on the free ends of the legs of the channels and are threadably tightened to draw the channels together and to exert a clamping force against the flat faces of the bus bars. A flat sided housing (16,24) is attached to the channels (6,14) and may be provided with access openings (16a) at intervals therealong for making plug-in connections with the bus bars.