Copper Bus Duct Sizing

Protect connections against corrosion.

Copper bus duct sizing.

Bus bar ampacity table ampacities of copper bus bars alloy uns c11000 dimension in. Area weight per ft in lb. Ampacities of copper no. Dc resistance at 20 c microhms ft.

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. 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. Ampacity of the bus bar selected must then be verified by checking table 1. Quick busbar selector knowing the ampacity designers and estimators can get the approximate bus bar size.

The underside is sealed so the bars can be safely mounted to conductive surfaces. 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. 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. Free online copper busbar weight calculator on smi copper website.

Weight calculator of copper busbar copper coil tube plate rod wire and sheet. This article presents a brief overview of ampacity charts for both copper and aluminum bus bar and shows how to interpret the data within. Covers protect the top of the bar and prevent accidental contact with live circuits. However these charts can only tell you so much.

Originally a busway consisted of bare copper conductors supported on inorganic. Table courtesy of copper development association inc. 30 c rise 50 c rise 65 c rise sq. 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. Understanding bus bar ampacity charts. Ampacities and mechanical properties of rectangular copper busbars. 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.

Ampacities of copper no. Refer catalogue of. There are a number of considerations that need to be recognized beyond the figures given in the chart. It is an alternative means of conducting electricity to power cables or cable bus.

Eaton s mission is to improve the quality of life and the environment through the use of power management technologies and services. These bars are tin plated copper and have stainless steel terminals.