Electrical Bus Bar Size Calculation

Busbar size should be equal or more than of 6300a.

Electrical bus bar size calculation.

Size would probably be adequate. Why star delta starters are preferred for higher hp motor. 25 x 5 25 x 8 25 x 10 30 x 5 30 x 8 30 x 10 40 x 5 40 x 8 50 x 5 50 x 8 50 x 10 80 x 5 80 x 8 80 x 10 100 x 20 110 x 10 sqmm etc. Now you have to make a cable connection with busbar.

Dc current when dealing with dc power the biggest concern is resistance per foot and the resulting voltage drop. Then check previous table to verify that size selected has the necessary ampacity. Calculate bus bar cross section area calculate current rating of bus bar calculate peak elector magnetic force between phase conductors calculate force on insulator of bus bar support. The bus bar 100mm x25mm x1 5mm is suitable for incomer current 100 25 1 5 1 2 4500a.

Calculation of busbar will denote by millimeter. Required ampacity range amp. Assume that required ampacity is 185 amps at 30 c rise. 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.

Now total ampere we can get. 7 responses to panel design calculate size of bus bar excel prudhvi raju. So the bus bar 100x25x1 5 is suitable for 100 25 1 5 0 8 3000a incomer current. Ampacity of the bus bar selected must then be verified by checking table 1.

Consultant recommended busbar size based on the thumb rule we noticed busbar size is low to carry 6300a. He is member of institution of engineers mie and ceng india. Example of busbar calculation. Table 2 indicates that 1 16 x 1 in.

When you are calculating the size of a busbar then you have to keep in mind its height and thickness of conductor plate that you use. Let s consider we have a 600kva power transformer or a generator which have 400v as line voltage. In case of aluminium bus bar the current carrying capacity is 0 8 max. Knowing required ampacity determine possible bus bar dimensions from the table.

So for our load 80 x 5 or 40 x 10 or 50 x 8 sqmm busbar enough is enough. In case of copper bus bar the current carrying capacity is 1 2 max. Bus bar cross section area as per short circuit 626 sq mm select higher size for bus bar cross section area between 436 sq mm and 626 sq mm final calculated bus bar cross section area 626 sq mm actual selected bus bar size is 75 10 750 sq mm. For example a 1 16 x 1 2 inch bus bar has an area of 0 0312 inches square and the equivalent circular area of 39 7 circular mils.