A/C Breaker size

[Michael Larson]

Originally Posted by rcooke

I... My $99:00 kodiac will go as close as 4 inches and I can blow that picture up on the Camera to confirm I have the info I need .
Liked it so much bought a spare holds 985 pictures so I can take pictures of every thing does a great job.
... Cookie

Is that a Canadian Camera??

[Robert J. OConnor]

Originally Posted by Greg Fretwell

I can see this going both ways. Certainly 240.4(B) would make this OK with nothing else considered but you run up against 110.3(B). The label does say 58a Max.

I agree that the label controls. But in my mind NEC 240.4.B really applies to upsizing an OCPD for a given ampacity of wires, and not upsizing a breaker for a stated Max OCPD from an AC condenser label (which is usually 175% to 225% of the load already per NEC 440.22).

For AC condensers you can upsize the OCPD from 175% of RLA, as long as it doesn't exceed 225% of the RLA per 440.22. But most manufacturers already consider this with the stated Max Breaker/Fuse Size on the equipment label.

Originally Posted by dnice

Large carrier A/C unit calls for Max breaker size of 58 amps. Is a 60 amp breaker in the main panel a problem?

What was the model number & serial number?

Also did you note the Running Load Amps (RLA) and the Minimum Circuit Ampacity from the nameplate?