Abstract: The following specification describes a panelboard assembly comprising a plurality of modular insulators having spaced integrally formed resilient mounting rails for supporting a circuit breaker housing above the panelboard bus bars. Each circuit breaker is connected to a bar carrying current of one phase and on tripping may generate ionized arc gases that exit the arc chute passage and engage a bus bar carrying current of another phase. A thermoplastic insulating material is interposed in the path between the arc chute passage and a bus bar carrying current of another phase. A bend is also introduced in the bus bars intermediate their ends to force an insulating member interposed between the bus bars and a cabinet wall against the cabinet wall.

Abstract: The following specification describes a panelboard assembly comprising a plurality of modular insulators each having an integrally formed resilient bead for engaging a circuit breaker housing recess to support a circuit breaker. A tongue on each insulator assists in disengaging the circuit breaker from the bead. Longitudinally extending bus bars are supported by the insulators in heat transmitting relationship to the metal wall of an enclosure. The insulators have long surface paths between adjacent bus bars and bus stabs to prevent electrical leakage. A neutral assembly in close space saving relationship to the bus bars and for convenient wiring is provided together with partition walls between phase bus bars and between individual bus stabs.

Abstract: The following specification describes a panelboard assembly comprising a plurality of modular insulators each having an integrally formed resilient bead for engaging a circuit breaker housing recess to support a circuit breaker. A tongue on each insulator assists in disengaging the circuit breaker from the bead. Longitudinally extending bus bars are supported by the insulators in heat transmitting relationship to the metal wall of an enclosure. The insulators have long surface paths between adjacent bus bars and bus stabs to prevent electrical leakage. A neutral assembly in close space saving relationship to the bus bars and for convenient wiring is provided together with partition walls between phase bus bars and between individual bus stabs.

Abstract: The following specification describes a cover for a panelboard with the cover carrying spring biased latch clamp assemblies for engaging the flanges formed on the side walls of the panelboard cabinet.