Copper Bus Bar Ampacity Calculator

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

Copper bus bar ampacity calculator. Knowing required ampacity determine possible bus bar dimensions from the table. Ampacities of copper no. The total current carrying capacity of the busbar is 1 2 area 1000 sqmm 1 2 1200 amps. Ampacity may be raised by increasing heat dissipation through the use of convection cooling or surface treatments.

14 awg 12 awg 10 awg 8 awg 6 awg 4 awg 3 awg 2 awg 1 awg 1 0 awg 2 0 awg 3 0 awg 4 0 awg 250 kcmil 300 kcmil 350 kcmil 400 kcmil 500 kcmil 600 kcmil 700 kcmil 750 kcmil 800 kcmil 900 kcmil. Copper alloy c11000 bus bar ampacity chart. Then check table 1 to verify that size selected has the necessary ampacity. For 60 hz current table gives bus bar cross sections which will probably be large enough for ampacities within each range.

Wire size awg or kcmil. However these charts can only tell you so much. Understanding bus bar ampacity charts. Ampacities in the table below are for bus bars having an emissivity of 0 4.

Ampacities and mechanical properties of rectangular copper busbars. Which means take a copper bus bar of 100 mm width and 10 mm thickness the area of the copper bus bar is 10 100 sqmm. Ampacity of the bus bar selected must then be verified by checking the ampacity table. Dc copper busbar ampacities.

Assume that required ampacity is 185 amp at 30 c rise. 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. Multiple busses also affect ampacity in a nonlinear relationship. 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.

Effects of emissivity and number of copper busses on ampacity data here show how higher emissivities improve ampacity. This article presents a brief overview of ampacity charts for both copper and aluminum bus bar and shows how to interpret the data within. 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.

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 of copper bus bars alloy uns c11000 3 8 x 3 4 281 358 1 09 29 3 1 02 415 1 02 550 1 02 630 3 8 x 1 375 477 1 45 21 9 1 03 510 1 03 680 1 03 790. Ampacities of copper no.