Copper Bus Bar Ampacity Chart

Ampacities and mechanical properties of rectangular copper busbars.

Copper bus bar ampacity chart.

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

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. Ampacities in the table below are for bus bars having an emissivity of 0 4. Dc copper busbar ampacities. Please consult a qualified electrician or professional engineer to determine the appropriate values for your specific application.

Ampacity of the bus bar selected must then be verified by checking table 1. However these charts can only tell you so much. Then check the ampacity table to verify that size selected has the necessary ampacity. Ampacities are based on the 2017 nec and do not reflect any temperature correction or ampacity adjustments that may be required.

Ampacities of copper alloy c11000 bus bars. Understanding bus bar ampacity charts. 30 c rise 50 c rise 65 c rise sq. 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.

The following tables have been provided by the alliance for telecommunications industry solutions atis t1 committee and represent ampacities for busbar sizes and arrangements typically found in the telecommunications industry. There are a number of considerations that need to be recognized beyond the figures given in the chart. Quick busbar selector knowing the ampacity designers and estimators can get the approximate bus bar size. This article presents a brief overview of ampacity charts for both copper and aluminum bus bar and shows how to interpret the data within.

Table gives bus bar cross section which will probably be large enough for ampacities within each range. Ampacities of copper no. Assume that required ampacity is 185 amps at 30 c rise. Table courtesy of copper development association inc.

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. Knowing required ampacity determine possible bus bar dimensions from this table. The number of sizes shown are not as extensive as those in the tables of ac ampacities and there may be slight discrepancies between. Ampacities and mechanical properties of rectangular copper busbars.

For currents below 300 amps please refer to the design guide formula.