Aluminum Bus Bar Current Carrying Capacity

Current rating of rectangular aluminum bus bar arrangements amperes for 6101 t61 alloy 57 iacs conductivity sizes inches 1 bar 2 bars 3 bars 4 bars dc 60 hz ac dc 60 hz ac dc 60 hz ac dc 60 hz ac 1 4 x 1 308 308 607 601 605 887 1203 1168 1 1 2 430 429 833 817 1235 1194 1637 1561.

Aluminum bus bar current carrying capacity.

According to the formula as per iec 62271 i. Aluminum and aluminum steel combinations fig. 13 5 m and n. The aluminium bus bar is cheaper than copper busbar but the resistivity of the aluminium busbar is high as compared with copper busbar.

However the trend has been toward wider use of aluminum for all types of bus installa tion. Free air conditions assume some air movement other than convection currents and may be applicable for outside installations. Apply our equation current carry capacity of 35 sqmm bar 0 8 35 28 amps. Ratings apply for single bars on edge operating in a 40 c ambient temperature with 50 c temperature rise.

Aluminium current carrying is equal to 0 8 times the total volume of the aluminium lenth breath thickness. Let s have a simple example of 4 sqmm bus bar. Busbar per phase for 630a. For reference please see ampacities of copper alloy c11000 bus bars or aluminum to copper ampacity comparison chart.

What is an ampacity chart. Generally current carrying capacity of al. An ampere is a unit that describes the level of electrical current carried by the conductor material. Is 0 8a per sqmm and copper is 1 6a per sqmm.

For the area 800 sq mm 80 x 10 mm current carrying capacity will be 960a then additional one run of busbar needed to carry the current of 1067a. Also aluminium has the less current carrying capacity. For tpn 3 5 x80x10 if we are going with copper. Ratings are for frequencies up to 60 hz.

These standards give maximum temperature rises as well as maximum ambient temperatures. Copper has excellent mechanical and electrical characteristics and for many years was the metal of choice for use as bus conductor. Bus bar ampacity table 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. It turns out that ampacity is a combination of the words ampere and capacity.

Aluminium busbar current carrying capacity 0 8 busbar width thickness in amps. How to calculate aluminium bus bar current carrying capacity. Suppose we need bus bar for 630a and we are going with aluminium bus bar 80 10 8 640a where 80 10 is size if bus bar usually available is the market.