Aluminum Bus Bar Current Carrying Capacity

Busbar per phase for 630a.

Aluminum bus bar current carrying capacity.

It turns out that ampacity is a combination of the words ampere and capacity. The aluminium bus bar is cheaper than copper busbar but the resistivity of the aluminium busbar is high as compared with copper busbar. Free air conditions assume some air movement other than convection currents and may be applicable for outside installations. The aluminium bus bar widely used and most popular than copper busbar.

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. According to the formula as per iec 62271 i. For reference please see ampacities of copper alloy c11000 bus bars or aluminum to copper ampacity comparison chart. How to calculate aluminium bus bar current carrying capacity.

Let s have a simple example of 4 sqmm bus bar. So we can use 80x10sqmm al. These standards give maximum temperature rises as well as maximum ambient temperatures. 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.

For tpn 3 5 x80x10 if we are going with copper. Ratings apply for single bars on edge operating in a 40 c ambient temperature with 50 c temperature rise. An ampere is a unit that describes the level of electrical current carried by the conductor material. Ratings are for frequencies up to 60 hz.

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. What is an ampacity chart. 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. Generally current carrying capacity of al.

Aluminium current carrying is equal to 0 8 times the total volume of the aluminium lenth breath thickness. Aluminum and aluminum steel combinations fig. Also aluminium has the less current carrying capacity. Is 0 8a per sqmm and copper is 1 6a per sqmm.

13 5 m and n. Copper has excellent mechanical and electrical characteristics and for many years was the metal of choice for use as bus conductor. Apply our equation current carry capacity of 35 sqmm bar 0 8 35 28 amps.