MOTOR DISCONNECT SIZING

[mstrlucky74]

Have a 480v 125hp motor feed from a 400a switch fused at 250a. How would you size the disconnect? Thanks

 

[don_resqcapt19]

Take a look at 430.110.

 

[mstrlucky74]

425A

 

[augie47]

i'd follow don's advise and go to 430.110 then the catalog for the manufacturer of my choice.
In some, if not all cases, your minimum size will be 200 AMP.

 

[Jraef]

425A

What does this mean? Surely you can't think the motor FLC is 425 Amps? And there is no Article 425 in the NEC.