Motor Branch circuit

[vicdelta]

I have a Exhuast Fan Motor with folloeing data on it.
Hp= 7.5 KVA
3 phase 240 Volts
FLC 21.7 Amps
Code J
Class B
Design A
PF 88.5%
I need to know,Fuse size,branch circuit size,Over load protection.

Thanks for your help

 

[celtic]

What did you come up with?

 

[vicdelta]

What did you come up with?

Branch circuit size #8THHN
Fuse size 21.7x1.75= 38A
Branch circuit over load 50A

 

[M. D.]

try this calculator http://www.electrician2.com/calculators/motor_ver_1.html

 

[celtic]

try this calculator http://www.electrician2.com/calculators/motor_ver_1.html

LOL

I was just plugging in the numbers over there....I got slightly different answers than posted.

 

[vicdelta]

try this calculator http://www.electrician2.com/calculators/motor_ver_1.html[/QUOTE

That was great calculator.
Thanks Very Much.

 

[celtic]

Here's some more to help clarify things....you can probably print them out when an internet connection isn't handy:
Conductor Sizing and Protection By Mike Holt, published in EC&M ...


Motors, Motor Circuits, and Controllers, Oh My!


Motor Calculations Part 1: Motors and Branch-Circuit Conductors