Panelboard for bolt-in and plug-in circuit breakers

An electrical panelboard comprising, in combination:

• a pair of support rails;
• a pair of insulating base members secured between said support rails at upper and lower ends thereof to mount said support rails in parallel spaced relation;
• a plurality of electrically conductive bus bars mounted to said insulating base members to extend parallel to said support rails;
• a plurality of insulating barrier members positioned between outer ones of said bus bars and stacked one upon another between said insulating base members;
• a plurality of branch circuit connectors each comprising a rigid flat strip of conductive material and secured at one respective end thereof to an outer one of said bus bars to extend laterally over a respective insulating barrier member toward the other outer one of said bus bars, each said strip disposed in a plane parallel to the flat plane of said bus bars and having in said plane a length greater than its width and extending in its lengthwise dimension over said respective insulating barrier, said strip further having means longitudinally spaced along the lengthwise dimension of said strip for securing the line side terminal of a bolt-in circuit breaker attached to said panelboard and for securing the line side terminal of a second bolt-in circuit breaker attached to said panelboard from the opposite side therof and co-linearly with the first mentioned bolt-in circuit breaker, and a pair of raised portions intermediate the lateral edges defining the narrow dimension of said strip and individually spaced longitudinally along the lengthwise dimension of said strip on longitudinally opposite sides of said means, a respective one of said raised portions individually securing the line side terminal of a plug-in circuit breaker alternatively attached to said panelboard in the same location as one of the aforementioned bolt-in circuit breakers.