Electrical Bus Bar Size Calculation

So for our load 80 x 5 or 40 x 10 or 50 x 8 sqmm busbar enough is enough.

Electrical bus bar size calculation.

Then check previous table to verify that size selected has the necessary ampacity. Required ampacity range amp. Table 2 indicates that 1 16 x 1 in. Knowing required ampacity determine possible bus bar dimensions from the table.

Calculation of busbar will denote by millimeter. In case of copper bus bar the current carrying capacity is 1 2 max. 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. So the bus bar 100x25x1 5 is suitable for 100 25 1 5 0 8 3000a incomer current.

Size would probably be adequate. 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. 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.

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. 7 responses to panel design calculate size of bus bar excel prudhvi raju. Why star delta starters are preferred for higher hp motor. Now total ampere we can get.

Consultant challenged contractor that. 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. The bus bar 100mm x25mm x1 5mm is suitable for incomer current 100 25 1 5 1 2 4500a. 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.

Busbar size should be equal or more than of 6300a. Now you have to make a cable connection with busbar. In case of aluminium bus bar the current carrying capacity is 0 8 max. Let s consider we have a 600kva power transformer or a generator which have 400v as line voltage.

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. Assume that required ampacity is 185 amps at 30 c rise. Typical size of the busbar available in the market. He is member of institution of engineers mie and ceng india.