Abstract: Hollow risers in switchgear are preferably formed by a confronting pair of spaced apart U-channels. Stab conductors for connecting switching apparatus in the switchgear to the risers have a pair of flat members straddling and secured to the two U-channels by mounts which include backing plates bearing against the inner surfaces of the confronting legs of two U-channels and bolts extending through the stab conductors and U-channel legs and engaging threaded apertures in the backing plates. To accommodate a range of current ratings, the confronting channels can have first and second leg thicknesses t.sub.1 and t.sub.2, which can be different but the outer widths of the channels are all the same. The backing plates have a first surface with a third thickness in one section and a fourth thickness in a second section. This first surface bears against the U-channel legs when the legs are of different thicknesses and t.sub.1 plus t.sub.3 is made equal to t.sub.2 plus t.sub.4.

Abstract: A network hub having a recessed portion on the front panel thereof, and a L-shaped cable holder pivotably connected to the recessed portion, wherein the L-shaped cable holder can be turned between the operative position in which network cables can be hung on the L-shaped cable holder and fixed thereto by a binding strap, and the non-operative position in which the L-shaped cable holder is closed on the recessed portion.

Abstract: An electric busbar for use with an electrical power distribution busway system which includes a press formed plug-in tab configured for attachment to a connector at a power tap-off section of the busway is described. The busbar has a substantially rectangular cross-section, a length, a width defined by a pair of edges, and a thickness defined by a top side and a bottom side. The plug-in tab is formed by pressing the conductive material in a direction generally perpendicular to the top and bottom sides until material is displaced outwardly from at least one of the edges. Depressions are formed in the bar of conductive material at the location of the press formed tab. In the most preferred embodiment, the volume of the depressions is substantially equal to the volume of the material in the tab.

Abstract: A three-phase electrical power distribution busway having neutral busbars configured to have a higher current carrying capacity than each of the phase busbars of the busway is described, The neutral busbars have a combined cross-sectional area which is greater than the cross-sectional area of each of the phase busbars. The neutral busbars have a rectangular cross-section configured to reduce the skin effect and reduce ohmic heating caused by increased neutral busbar currents resulting from non-linear loads.

Abstract: A protective casing for preventing any accidental introduction of metal parts into a column containing an array of electric distribution busbars is made up of two identical insulating half-casings (3) coupled together by interengagement of external engagement regions (18A, 20A, 22A, 24A) and of internal engagement regions (18B, 20B, 22B, 24B) up to a mutual coupling position which is variable according to the dimension of the busbars. The busbars are inserted in housings (29, 30) and pass through recesses (9A, 11A, 11B, 9B, 13) in the lateral walls of the casing. Fixing bolts extending between the busbars are surrounded by insulating sleeves (21) formed by interpenetrating outer and inner tongues (23 and 25) separated by slits (36). The sleeves (21) are made integral with the half-casings by molding of plastic material.

Abstract: A vertical bus bar arrangement has three phases, each consisting of two U-shaped members disposed to form an H-configuration and a flat, rectangular bar spaced away from and on each side of the H-configuration. Insulator members are arranged between the bus bar arrangement and the brace members. The insulator members have extended portions raised away from the surface of the bus bars for receiving part of the two interconnected barrier members. The insulator members and a substantial portion of the barrier members form a labyrinth between phases. The barrier members have knockout portions for the electrical connections of the bus bars, and also portions for covering the raw edges of the bus bars in the areas through which the runbacks extend. The crossbars are connected to the bus bars by at least two connectors, one of which extends in the gap formed by the connectors of the bus bars, and one of which extends alongside the flat bar and parallel to the first connector.

Abstract: A bus bar for power supply is comprised of a pipe-shaped outer conductor and at least one inner conductor inserted therein. The inner conductor is also formed in a pipe shape and serves as a coolant flow passage. Insulation is interposed between the outer conductor and the inner conductor to electrically isolate them from each other.

Abstract: A copper busbar is created in H-shaped cross-section by assembling a pair of elongated copper bars of rectangular cross-section to one or more conjoining copper webs of U-shaped cross-section. The bars and web legs are pre-punched with series of holes accommodating bolts clamping the bars to the web in parallel spaced relation. The bridging portion of the web is also pre-punched with a series of bolt holes facilitating the implementation of the busbar as a riser bus in electrical distribution equipment, such as switchboards, switchgear, and the like.

Abstract: In electric switchgear for high voltages a busbar system, of which each busbar consists of two identical rod-shaped conductors which are fastened by bolts to supporting insulators in specularly symmetric fashion.

Abstract: A control center characterized by vertical bus bars having electrically insulating covers thereon which covers are in surface-to-surface contact with all surfaces of the bus bars except for spaced areas where connection is made by conductors for load distributions. In addition, each pair of spaced bus bars are isolated from each other by interfitting portions of the covers which portions are coextensive with the bus bars so that resistance to tracking and arcing between the bus bars is maximized.