Transformer busbar

It dependes on the voltage of the winding connected to the busbar.

Try a search engine and look for rating charts or tables for busbars.

Yahlasit

if you have 415 volts then 800 amps

guest,

pls consider also transformer's vector group (delta or wye connected) since it will affect each phase current.

dear ,

what about the fault level capacity rating ?

what about the temperature rise limits ?

Then, you may need 1000A bus bar as well, for the same duty.

you may like to use 1000 A busbar at 380 volt

Dear Guest,

The FLA of 500 Kva Transformer @ 415 volts is 695 Amps to be specific.

Please add 20 % for any instantaneous loads - 695 x 1.2 = 834 Amps. The Busbar

can be rated for 800 A ( as pointed by one of our readers) or 850 Amps. The Size

will depend on the meterial copper or Aluminium. and the stacking factor.

Manroop.Chennai.

dear,

this may help...old method in sizing bus bar will be using 1.55A/sq.mm curent density...but a 1.0 A/sq. mm would be best suited for the calculation...this is to cope up with load growth and derating factors...