Re: Required Power Supply Formula

Home Electrical Engineering Forum General Discussion Required Power Supply Formula Re: Required Power Supply Formula

Spir Georges GHALI

jj said:

Hi Guys, I'm new here. Please help me out. I hv a 1 no. Exhaust Air Fan of 25kW with Full Load Current of 43.5A -400v.  What is the required power/current rating should I supply? (i.e. isolator/socket outlet rating)

Can any of you guys out there, show me how can I calculate this and what is the formula?


Dear ;

If you want to install an Isolater or Socket, the nimonal current should be ” 63A “, But if you want to protect the fan's motor, it's better to use a ” Motor Circuit Breaker ” that should be adjusted around 43A.