Copper Bus Pipe Ampacity

For seamless bus tubing over 6 inches see page 618.

Copper bus pipe ampacity. Ampacities of copper no. Ampacities of copper no. Area weight per ft in lb. Direct current ampacities may differ from ac ampacities because of ac skin effect.

Ampacities and mechanical properties of rectangular copper busbars. 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. Standard pipe sizes inside inche s weigh t lbs. This article presents a brief overview of ampacity charts for both copper and aluminum bus bar and shows how to interpret the data within.

Understanding bus bar ampacity charts. Quick busbar selector knowing the ampacity designers and estimators can get the approximate bus bar size. Bus bar ampacity table ampacities of copper bus bars alloy uns c11000 dimension in. There are a number of considerations that need to be recognized beyond the figures given in the chart.

Seamless bus pipe is generally made of 6063 t6 alloy in ansi schedule 40 pipe because of its excellent mechanical and electrical properties. Table gives bus bar cross section which will probably be large enough for ampacities within each range. Dc resistance at 20 c microhms ft. Ampacities of copper no.

110 bus bars ampacities in this table are for bus bars having an emissivity of 0 4. Ampacities and mechanical properties of rectangular copper busbars. Skin effect ratio at 70 c. Copper ampacity charts xls author.

Of tube size of tube ips. Then check the ampacity table to verify that size selected has the necessary ampacity. 110 busbars ampacities in the table below are for bus bars having an emissivity of 0 4. 30 c rise 50 c rise 65 c rise sq.

Knowing required ampacity determine possible bus bar dimensions from this table. 6061 t6 alloy tubular bus is used where high strength and lower conductivity are required. Standard pipe sizes extra heavy pipe sizes current rating in amperes outside inches inside inches outdoor indoor size of tube ips. Current rating in amperes 1.

Skin effect ratio at 90 c. Ampacity of the bus bar selected must then be verified by checking table 1. Brian teal created date. Assume that required ampacity is 185 amps at 30 c rise.

Of tube wall thick. Substation supply company design data current ratings for bare copper tubular bus 2. 30 c rise 50 c rise 65 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.

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.