Electric Power Busway Plug Alignment Arrangement

Electric bus bars are electrically insulated from each other and from the busway housing by means of an epoxy coating as described within U.S. Pat. No. 4,804,804. The bus bars and the housing sideplates are fastened together by means of an insulated bolt that transfers through apertures formed within the bus bars and the housing sideplates. U.S. Pat. application Ser. No. 281,415 filed Dec. 8, 1988 entitled "Insulated Electrical Power Distribution Busway Tabs" describes plug-in stabs that are attached to the respective bus bars for electrical connection within an industrial power distribution circuit. This Patent Application is incorporated herein for reference purposes and should be reviewed for a description of the use of plug-in stabs that are arranged for connection with an electric busway switch. One such switch being described within U.S. Pat. No. 3,354,352 which Patent is incorporated herein for reference purposes. An electric outlet box which insulates and protects the bus bar stabs is described in U.S. Pat. 4,820,178 which Patent is also incorporated herein for reference purposes. When making electrical connection between the electric busway switch and the electric busway system, it is important that the connector clips extending from the bottom of the electric busway switch exactly align with the bus bar tabs extending upward from the busway system in order to prevent damage to the busway tabs. It is also important to ensure that the respective connector clips become attached to the respective bus bar tabs within the proper phases of the electrical power distribution circuit.

One purpose of the instant invention accordingly is to provide an electric busway switch that properly aligns and connects with an electric busway system without substantial modification to either the electric busway switch or the busway system.

A locating and alignment pin is secured to the bottom of an electric busway switch respective to the electric busway switch connector clips and interlock lever. A corresponding locating aperture is provided in the top surface of the electric busway housing relative to the busway plug outlet box. The electric busway switch is traversed along the busway rails until the locating and alignment pin enters within the busway housing locating aperture. The connector clips can then be attached to the upstanding bus bar tabs to complete the electrical connection.

FIG. 1 is a top perspective view of the electric busway switch connected to the electric busway system in accordance with the invention; and

FIG. 2 is a top perspective view of the busway system of FIG. 1 with the electric busway switch in isometric projection.

A busway system 10 similar to that described within aforementioned U.S. Pat. 4,804,804, which Patent is incorporated herein for reference purposes is depicted in FIG. 1. The busway system consists of a housing 11 fabricated from an aluminum alloy having high tensile strength and excellent thermal conductive properties. The bus bars 12 are arranged within the housing and electrical access is provided to the bus bars by means of a busway plug outlet box 13. An electric busway switch 14 interconnects with the bus bars and provides connection with electrical take-off cables through knock-out 16 provided in the side of the switch. An operating handle 15 provides ON - OFF connections with the bus bars and related electrical equipment through the connector cables (not shown). The electric busway switch 14 is shown prior to connection with the electric busway system 10 in FIG. 2.

When making electrical connection between the phase connector clips 22, depending from the bottom 23 of the electric busway switch 14, and the corresponding tabs 34A-34C, which are attached to corresponding bus bars 12, the electric busway switch is arranged over the busway outlet box 13 with the cover 13A in its open position. The ground contact plates 28, 29 on the electric busway switch are arranged intermediate the upstanding side rails 31, 32 on the electric busway housing 11. The ground contact plates 28, 29 on the bottom of the electric busway switch are positioned on the side rails and the electric busway switch is moved along the top of the busway outlet box until the locating and alignment pin 18 attached to the bottom 23 of the electric busway switch by means of angulated bracket 19 falls within the locating aperture 20 formed in the top surface of the housing. The electric busway switch is then pressed downward whereby the phase connector clips 22 engage the corresponding connector tabs 34A-34C that extend up through slots 35 formed in the busway outlet box while the neutral connector clip 24 on the electric busway switch connects with the neutral tab 36 within the busway outlet box. At this time, the interlock lever 27 extends within the interlock slot 33 formed in the bottom of the busway housing. The hook portion of the interlock lever is coated with an epoxy or similar insulating coating as depicted at 27A. Securing clamps 25, 26 are fastened to housing 11 to complete the installation of the electric busway switch. Electric power connection between the electric busway switch and associated electrical equipment cable (not shown) is made by removing the knock-out 16 when such knock-outs are employed. The electric busway switch is then turned from its OFF to its ON condition by means of the operating handle 15.

A simple and economical means in the form of a locating and alignment pin in cooperation with a locating aperture for aligning an electric busway switch with an electric busway system has herein been described.