Copper Bus Duct Sizing

Quick busbar selector knowing the ampacity designers and estimators can get the approximate bus bar size.

Copper bus duct sizing.

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. Table courtesy of copper development association inc. Originally a busway consisted of bare copper conductors supported on inorganic. We provide sustainable solutions that help our customers effectively manage electrical hydraulic and mechanical power more safely more efficiently and more reliably.

Understanding bus bar ampacity charts. 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. Also known as bus bars they serve as connection points between wires with ring or spade terminals. 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.

30 c rise 50 c rise 65 c rise sq. Protect connections against corrosion. Dc resistance at 20 c microhms ft. Free online copper busbar weight calculator on smi copper website.

Ampacities of copper no. Ampacities of copper no. Ampacities and mechanical properties of rectangular copper busbars. 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.

These bars are tin plated copper and have stainless steel terminals. Ampacity of the bus bar selected must then be verified by checking table 1. Eaton s mission is to improve the quality of life and the environment through the use of power management technologies and services. 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.

Refer catalogue of. Bus bar ampacity table ampacities of copper bus bars alloy uns c11000 dimension in. It is an alternative means of conducting electricity to power cables or cable bus. Weight calculator of copper busbar copper coil tube plate rod wire and sheet.

Area weight per ft in lb. There are a number of considerations that need to be recognized beyond the figures given in the chart. This article presents a brief overview of ampacity charts for both copper and aluminum bus bar and shows how to interpret the data within. Ampacities and mechanical properties of rectangular copper busbars.

However these charts can only tell you so much. 110 busbars ampacities in the table below are for bus bars having an emissivity of 0 4.