Copper Bus Bar Ampacity Chart

Knowing required ampacity determine possible bus bar dimensions from this table.

Copper bus bar ampacity chart.

Ampacity of the bus bar selected must then be verified by checking table 1. Please consult a qualified electrician or professional engineer to determine the appropriate values for your specific application. Dc resistance at 20 c microhms ft. This article presents a brief overview of ampacity charts for both copper and aluminum bus bar and shows how to interpret the data within.

Area weight per ft in lb. Ampacities of copper alloy c11000 bus bars. The number of sizes shown are not as extensive as those in the tables of ac ampacities and there may be slight discrepancies between. Then check the ampacity table to verify that size selected has the necessary ampacity.

Understanding bus bar ampacity charts. 30 c rise 50 c rise 65 c rise sq. 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. Ampacities in the table below are for bus bars having an emissivity of 0 4.

This table is generally used for currents above 300 amps. Dc copper busbar ampacities. Assume that required ampacity is 185 amps at 30 c rise. 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. 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. There are a number of considerations that need to be recognized beyond the figures given in the chart. Ampacities and mechanical properties of rectangular copper busbars.

Quick busbar selector knowing the ampacity designers and estimators can get the approximate bus bar size. Ampacities of copper no. Table gives bus bar cross section which will probably be large enough for ampacities within each range. Ampacities are based on the 2017 nec and do not reflect any temperature correction or ampacity adjustments that may be required.

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

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.