20A/15A Breakers

[textmi]

I am working on a project where all the existing breakers are 20 A or greater. We are replacing some exhaust fans and the MOCP of the new fans are rated at 15 A. The fans are 460V/3ph and 115V/1ph. The fans are provided with non-fused disconnects with thermal overloads. Is it acceptable to use the existing 20 A breakers or do they need to all be downsized to 15A?

 

[hbiss]

We are replacing some exhaust fans and the MOCP of the new fans are rated at 15 A... Is it acceptable to use the existing 20 A breakers or do they need to all be downsized to 15A?

Yes, 15A.

-Hal

 

[LarryFine]

The fans are provided with non-fused disconnects with thermal overloads.

Do they limit the current to 15a?

 

[augie47]

IOf the MOCP is 15 amps, somewhere in the circuit you need 15 amp protection. Changing the breakers or changing the disconnects to fusible would work.