Panelboard with insulative snap-in support means

An improved panel interior assembly of the type comprising a pan, an elongated insulating support structure mounted on the pan and a pair of elongated bus bars, each bus bar comprising an elongated body portion and a plurality of stabs extending from the body portion in a longitudinally spaced relationship, the body portion having opening means therein, the insulating support structure comprising a body portion having a plurality of longitudinally spaced ledge parts at each of two opposite sides thereof, a plurality of transversely extending longitudinally spaced fingers extending from each side of the body portion of the insulating support structure, at each of said two opposite sides of said insulating support structure all adjacent spaced ledges being spaced by a stab-receiving slot, said ledge parts and said stab-receiving slots of said two opposite sides being staggered lengthwise such that each stab-receiving slot at each side of said insulating support structure is opposite a ledge part of the opposite side of said insulating support structure, said pair of bus bars being supported on said opposite sides of said insulating support structure with the spaced stabs of each bus bar being positioned in the associated slots and with the spaced ledge parts of the associated side being positioned over parts of the associated bus bars, said stabs of said pair of bus bars being positioned in an interleaved relationship aligned lengthwise along said insulating support structure, each of said bus bars being supported by the ledge parts and resting on the associated fingers and projection means on top of said ledge parts cooperating with the opening means on said body portions of said bus bars to retain said bus bars in the mounted position on said insulating support structure wherein the improvement comprises a plurality of integrally molded pins attached to said insulating support structure extending through holes in a pan to which the insulating support structure is attached and an ultrasonically staked head formed on at least one pin after the pin has been inserted into a hole.