Copper Bus Bar Ampacity

Electrical current carrying requirements determine the minimum cross sectional area of the conductors.

Copper bus bar ampacity.

Understanding bus bar ampacity charts. Ampacities and mechanical properties of rectangular copper busbars. 30 c rise 50 c. Quick busbar selector knowing the ampacity designers and estimators can get the approximate bus bar size.

The number of sizes shown are not as extensive as those in the tables of ac ampacities and there may be slight discrepancies between. Ampacity of the bus bar selected must then be verified by checking table 1. This article presents a brief overview of ampacity charts for both copper and aluminum bus bar and shows how to interpret the data within. Dc copper busbar ampacities.

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. Dc resistance at 20 c microhms ft. Quick copper bus bar design selector knowing the ampacity designers and estimators can get the approximate bus bar size. 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.

Effect of emissivity and number of busses on ampacity data here show how higher emissivities improve ampacity. Ampacities in the table below are for bus bars having an emissivity of 0 4. Ampacities of copper no. 110 busbars ampacities in the table below are for bus bars having an emissivity of 0 4.

Quick bus bar selector knowing the ampacity designers and estimators can get the approximate bus bar size. 30 c rise 50 c rise 65 c rise sq. However these charts can only tell you so much. Ampacity of the bus bar selected must then be verified by checking table 1.

Bus bar ampacity table ampacities of copper bus bars alloy uns c11000 dimension in. Calculating conductor size is very important to the electrical and mechanical properties of a bus bar. 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. There are a number of considerations that need to be recognized beyond the figures given in the chart.

Multiple busses also affect ampacity in a. 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. Ampacities and mechanical properties of rectangular copper busbars. 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.

Area weight per ft in lb. Table courtesy of copper development association inc.