Aluminum Bus Bar Current Carrying Capacity

Apply our equation current carry capacity of 35 sqmm bar 0 8 35 28 amps.

Aluminum bus bar current carrying capacity.

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. Aluminum and aluminum steel combinations fig. 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.

Busbar per phase for 630a. Free air conditions assume some air movement other than convection currents and may be applicable for outside installations. Generally current carrying capacity of al. According to the formula as per iec 62271 i.

So we can use 80x10sqmm al. Is 0 8a per sqmm and copper is 1 6a per sqmm. Aluminium current carrying is equal to 0 8 times the total volume of the aluminium lenth breath thickness. How to calculate aluminium bus bar current carrying capacity.

For tpn 3 5 x80x10 if we are going with copper. 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. Ratings are for frequencies up to 60 hz. Ratings apply for single bars on edge operating in a 40 c ambient temperature with 50 c temperature rise.

The current carrying capacity of a busbar is usually determined by the maximum temperature at which the bar is permitted to operate as defined by national and international standards such as british standard bs 159 american standard ansi c37 20 etc. Also aluminium has the less current carrying capacity. An ampere is a unit that describes the level of electrical current carried by the conductor material. It turns out that ampacity is a combination of the words ampere and 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. Let s have a simple example of 4 sqmm bus bar. Copper has excellent mechanical and electrical characteristics and for many years was the metal of choice for use as bus conductor. However the trend has been toward wider use of aluminum for all types of bus installa tion.

These standards give maximum temperature rises as well as maximum ambient temperatures. 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. Aluminium busbar current carrying capacity 0 8 busbar width thickness in amps.