Bus duct

Claim 2

A section of bus duct comprising an elongated housing, a set of elongated bus bars supported in said housing, said bus bars of said set comprising three elongated phase-carrying bus bars and at least two elongated additional bus bars, said section comprising a main body part intermediate the ends thereof, said bus bars of said set at said main body part being positioned in a stacked relationship comprising four layers with each of said three phase-carrying bus bars occupying a separate one of said layers and with said two additional bus bars occupying the fourth of said layers, said housing at said main body part comprising a main body part housing construction, said main body part housing construction comprising a first pair of oppositely disposed housing parts, at said main body part means drawing said first pair of oppositely disposed housing parts toward each other against the outer layers of said four layers four to draw said four layers toward each other into a compact sandwiched relationship.

Claim 3

A section of bus duct according to claim 1, each of said elongated bus bars being generally flat and having in cross section a widthwise dimension and a thickness dimension, and the combined widthwise dimensions of said additional bus bars in said fourth layer being less than the widthwise dimension of each of said phase-carrying bus bars.

Claim 4

A section of bus duct according to claim 2, said additional bus bars being exactly two bus bars, each of said phase-carrying bus bars at said main body part comprising a conducting bar and an insulating sleeve on the conducting bar, a first of said additional bus bars at said main body part comprising a conducting bar and an insulating sleeve on the conducting bar, and the second of said additional bus bars at said main body part being uninsulated and in electrical contact with one of said housing parts to provide an internal ground in said section of bus duct.

Claim 5

A section of bus duct according to claim 3, and the thickness dimension of said first additional bus bar being the same as the thickness dimension of each of said phase-carrying bus bars.

Claim 6

A section of bus duct according to claim 1, said additional bus bars being exactly two bus bars occupying said fourth layer in a spaced relationship, said fourth layer being an outer layer adjacent one of said housing parts.

Claim 7

A section of bus duct according to claim 5, each of said phase-carrying bus bars at said main body part comprising a phase-carrying conducting bar and an insulating sleeve on said phase-carrying conducting bar, each of said additional bus bars at said main body part comprising a neutral conducting bar and an insulating sleeve on said neutral conducting bar, aNd the thickness dimension of each of said additional bus bars being substantially the same as the thickness dimension of each of said phase-carrying bus bars.

Claim 8

A first section of bus duct according to claim 1, said first section comprising a first connecting end part, said additional bus bars of said first section being exactly two bus bars, a second section of bus duct according to claim 1, said second section comprising a second connecting end part, said additional bus bars of said second section being exactly two bus bars, the bus bars of the set the bus bars of the set of said first section at said first connecting end part and the bus bars of the set of said second section at said second connecting end part being offset to provide spacing for a lap-type connection having insulating spacing means between adjacent connected bus bars of adjacent layers, connecting means connecting said first connecting end part of said set of bus bars of said first section to said second connecting end part of said set of bus bars of said second section in an end-to-end lapped relationship with each phase-carrying bus bar of said set of bus bars of said first section in a lapped relationship with a separate phase-carrying bus bar of said set of bus bars of said second section and with each of said additional bus bars of said set of bus bars of said first section in lapped relationship with a separate additional bus bar of said set of bus bars of said second section, insulating spacing means between adjacent connected bus bars of adjacent layers, said connecting means comprising a single-bolt structure extending through opening means in said phase-carrying bus bars and insulating means and extending generally between said two additional bus bars of each of said sections, said one-bolt structure being tightened to draw said lapped bus bars and said insulating spacing means into a compact sandwiched relationship to physically and electrically connect said sets of bus bars of said sections.

Claim 9

Bus duct according to claim 7, in each of said sections said additional two bus bars occupying said fourth layer in a spaced relationship, and said fourth layer in each of said sections being an outer layer adjacent one of said housing parts of the associated section.

Claim 10

A section of bus duct according to claim 8, in each of said sections each of said phase-carrying bus bars at the main body part comprising a phase-carrying conducting bar and an insulating sleeve on the phase-carrying conducting bar, in each of said sections each of said additional bus bars at the main body part comprising a neutral conducting bar and an insulating sleeve on the neutral conducting bar, and in each of said sections the thickness dimension of each of said additional bus bars being substantially the same as the thickness dimension of each of the phase-carrying bus bars of the section.

Claim 11

A section of bus duct according to claim 7, in each of said sections each phase-carrying bus bar at the main body part comprising a conducting bar and an insulating sleeve on the conducting bar, in each of said sections a first of said additional bus bars at the main body part comprising a conducting bar and an insulating sleeve on the conducting bar, and in each of said sections the second of said additional bus bars being an uninsulated conducting bar in electrical contact with one of the housing parts of the section to provide an internal ground in the section.