Lighting circuit breaker panelboard modular assembly including circuit breaker support mounting brackets

Claim 1

A circuit breaker panelboard assembly comprising: closure means comprising opposing side walls and opposing end walls joined by a bottom housing at least one main circuit breaker or at least one main wire terminal lug and a plurality of branch circuit breakers; access means movably arranged on said closure means providing access to said main and said branch circuit breakers from outside of said closure means; circuit breaker mounting means within said closure supporting said branch circuit breakers and providing electrical connection between said branch circuit breakers and electrical bus bars connectable with an external circuit; shield means intermediate said access means and said main and branch circuit breakers preventing contact with electrical terminals on said main and branch circuit breakers; and a pair of angulated brackets attached at one end to said bottom and at an opposite end to a corresponding pair of mounting rails, said circuit breaker mounting means being arranged across said pair of mounting rails; said angulated brackets each comprising a metal plate formed into a top and a bottom step offset from a vertical riser, said top and bottom steps each containing a keyhole shaped opening and a plurality of bolt access openings, said top and bottom keyhole shaped openings each facing in opposite directions and each defining a large and small diameter passage; whereby the small diameter passage on said bottom keyhole shaped opening is opposite in direction from said small diameter passage on said top keyhole shaped opening.