Copper Bus Duct Sizing

This article presents a brief overview of ampacity charts for both copper and aluminum bus bar and shows how to interpret the data within.

Copper bus duct sizing.

110 busbars ampacities in the table below are for bus bars having an emissivity of 0 4. This method should only be used to estimate a likely size of busbar the final size being chosen after consideration has been given to the calculation methods. Ampacities and mechanical properties of rectangular copper busbars. Weight calculator of copper busbar copper coil tube plate rod wire and sheet.

Area weight per ft in lb. We provide sustainable solutions that help our customers effectively manage electrical hydraulic and mechanical power more safely more efficiently and more reliably. Ampacities of bus bar systems of other configurations must be calculated taking into account size spacing number of bus bars and overall skin effect ratio. Also known as bus bars they serve as connection points between wires with ring or spade terminals.

The underside is sealed so the bars can be safely mounted to conductive surfaces. In mcm thousand circ mils skin effect ratio at 90 c 60 hz ampacity amp skin effect ratio at 90 c 60 hz ampacity amp skin effect ratio at 90 c 60 hz ampacity. Ampacities of copper no. Understanding bus bar ampacity charts.

Bus bar ampacity table ampacities of copper bus bars alloy uns c11000 dimension in. Covers protect the top of the bar and prevent accidental contact with live circuits. Refer catalogue of. 30 c rise 50 c rise 65 c rise sq.

Protect connections against corrosion. Eaton s mission is to improve the quality of life and the environment through the use of power management technologies and services. In electric power distribution a bus duct also called busway is a sheet metal duct or also cast resin insulated containing either copper or aluminium busbars for the purpose of conducting a substantial current of electricity. A very approximate method of estimating the current carrying capacity of a copper busbar is to assume a current density of 2 a mm2 1250 a in2 in still air.

This was observed on samples exposed for 60 days in an industrial environment and it is probably identical to that of bus bars in service. Table courtesy of copper development association inc. Ampacities of copper no. Quick busbar selector knowing the ampacity designers and estimators can get the approximate bus bar size.

Dc resistance at 20 c microhms ft. Ampacities and mechanical properties of rectangular copper busbars. Originally a busway consisted of bare copper conductors supported on inorganic. Free online copper busbar weight calculator on smi copper website.

It is an alternative means of conducting electricity to power cables or cable bus. Ampacity of the bus bar selected must then be verified by checking table 1.