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.

Copper alloy c11000 bus bar ampacity chart. Ampacities of copper alloy c11000 bus bars. 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. 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.

Wire size awg or kcmil. However these charts can only tell you so much. The number of sizes shown are not as extensive as those in the tables of ac ampacities and there may be slight discrepancies between. This article presents a brief overview of ampacity charts for both copper and aluminum bus bar and shows how to interpret the data within.

Ampacity may be raised by increasing heat dissipation through the use of convection cooling or surface treatments. Ampacities and mechanical properties of rectangular copper busbars. Ampacities of copper no. Ampacity of the bus bar selected must then be verified by checking the ampacity table.

Multiple busses also affect ampacity in a nonlinear relationship. 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. Knowing required ampacity determine possible bus bar dimensions from the table. Assume that required ampacity is 185 amp at 30 c rise.

There are a number of considerations that need to be recognized beyond the figures given in the chart. For 60 hz current table gives bus bar cross sections which will probably be large enough for ampacities within each range. Dc copper busbar ampacities. 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.

The total current carrying capacity of the busbar is 1 2 area 1000 sqmm 1 2 1200 amps. Ampacities in the table below are for bus bars having an emissivity of 0 4. Effects of emissivity and number of copper busses on ampacity data here show how higher emissivities improve ampacity. 110 busbars ampacities in the table below are for bus bars having an emissivity of 0 4.

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. Ampacities of copper no. Wire ampacity calculator enter the information below to calculate the maximum allowable ampacity for current carrying conductors.