Copper Bar Electrical Rating

Area weight per ft in lb.

Copper bar electrical rating.

Ratings are for frequencies up to 60 hz. 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. Current ratings are based on temperature rise of busbars h b dwight. It s often used for transformer and circuit breaker terminals welding torch tips and fasteners.

Download our copper busbar rating table as pdf. Ampacities of copper no. Lets us have a simple example of 35 sqmm bus bar. Apply our equation current carry capacity of 35sqmm bar 1 2 35 42 amps.

Approx d c resistance 20 c. Ampacities of copper alloy c11000 bus bars. Dc resistance at 20 c microhms ft. It turns out that ampacity is a combination of the words ampere and capacity.

110 busbars ampacities in the table below are for bus bars having an emissivity of 0 4. Rev vol 43 for multiple bar arrangements the space between the bars is equal to busbar thickness. What is an ampacity chart. For reference please see ampacities of copper alloy c11000 bus bars or aluminum to copper ampacity comparison chart.

30 c rise 50 c rise 65 c rise sq. 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 ratio at. Ac ratings are based on spacings at which the proximity effect is negligible. Ampacities of copper no.

Ampacities in the table below are for bus bars having an emissivity of 0 4. Ratings apply for single bars on edge operating in a 40 c ambient temperature with 50 c temperature rise. Copper busbar rating austral wright metals. Ampacity of the bus bar selected must then be verified by checking table 1.

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. Bus bar ampacity table ampacities of copper bus bars alloy uns c11000 dimension in. Ampacities and mechanical properties of rectangular copper busbars. Copper current carrying is equal to 1 2 times the total volume of the copper lenth breath thickness.

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. Quick busbar selector knowing the ampacity designers and estimators can get the approximate bus bar size. Ampacities and mechanical properties of rectangular copper busbars. The total current carrying capacity of the busbar is 1 2 area 1000 sqmm 1 2 1200 amps.

Also called tellurium copper 145 copper contains tellurium which makes it more machinable than all other copper while maintaining good corrosion resistance and high electrical conductivity.