Segmented electrical panelboard for industrial frame and residential frame circuit breakers which accepts residential frame circuit breakers at any segment

An electrical panelboard assembly receiving industrial frame and residential frame circuit breakers, said industrial frame circuit breakers having a pole-to-pole spacing that is unequal to the pole-to-pole spacing or multiples thereof for said residential frame circuit breakers, said panelboard assembly comprising, in combination:

• a pair of spaced, parallel, vertically extending mounting rails;
• upper and lower insulating bus support means attached to said mounting rails and extending transversely therebetween;
• a plurality of electrically conductive bus bars supported by said upper and lower insulating bus support means, said bus bars extending parallel to said mounting rails and being transversely spaced therebetween;
• means defining a plurality of vertically equal contiguous segments for said panelboard between said upper and lower insulating bus support means, said segments extending transversely of said panelboard;
• means selectively mounting either industrial frame or residential frame circuit breakers in any one of said segments comprising first and second sets of mounting means on said bus bars in each of said segments and attaching branch circuit connectors to said bus bars, said first set of mounting means being spaced vertically at first intervals corresponding to the pole-to-pole spacing of said industrial frame circuit breakers and mounting a first set of branch circuit connectors which electrically connect industrial frame circuit breakers to said panelboard, and said second set of mounting means being spaced vertically at second intervals unequal to said first intervals and corresponding to the pole-to-pole spacing of said residential frame circuit breakers and mounting a second set of branch circuit connectors which electrically connect residential frame circuit breakers to said panelboard, said bus bars having only one of said first and second sets of said branch circuit connectors mounted thereto within any segment;
• said circuit breakers mounted on said panelboard within said segments to extend transversely of said panelboard;
• attachment means securing the outboard ends of said circuit breakers to said mounting rails, the inboard ends of said circuit breakers being secured by connections thereof with respective branch circuit connectors, said attachment means and said respective branch circuit connectors cooperating to mount said circuit breakers such that their forward surfaces are disposed in a common vertical plane;
• cover means supported from said mounting rails and spaced forwardly thereof for overlying portions of said circuit breakers, said cover means having a single opening therein corresponding to the total contiguous segments and through which said forward surfaces of said circuit breakers project;
• and
• a plurality of supplemental cover means corresponding to said segments and portions of said segments for selectively closing off portions of said opening in said cover means.