240 on 480v

[Jraef]

So was someone trying to make the argument that if they use a higher ampler rating, it’s equivalent to having a higher voltage rating? That’s demonstrating a total lack of understanding of electrical equipment if so and whomever made that argument should stay away from electrical work entirely!!!

 

[JFletcher]

60 amps is 60 amps regardless of voltage. You cannot use a 120 / 240 volt breaker or a straight rated 240-volt breaker on 277 / 480. It may not even be possible to find a lower voltage breaker that fits in the panel or frame of the higher voltage equipment, and even if it was it is definitely inadvisable and not code.

Putting a 120 amp breaker in place of a 60 that was properly sized from the outset is also a code violation, regardless of the voltage rating of that breaker. if the 60 amp was the wrong size from the get-go, say somebody miscalculated badly for a motor load, that might be the only case where the 120 is acceptable.(eta: if it is rated for the proper voltage)

I agree with Jraef and Little Bill.

I would have also, personally, spent the time researching the cause of the breaker trip.

Edited to add: there is also the matter of the AIC rating of the breaker.

 

[winnie]

The only place where I've seen something close to 'higher amperage used at lower amperage and higher voltage' is in the AIC ratings of breakers, where I've seen breaker that have higher AIC ratings at lower voltage.

Otherwise I agree that you can't trade voltage for current in breaker ratings...unless you put a transformer into the circuit

-Jon

 

[jumper]

The only place where I've seen something close to 'higher amperage used at lower amperage and higher voltage' is in the AIC ratings of breakers, where I've seen breaker that have higher AIC ratings at lower voltage.

Otherwise I agree that you can't trade voltage for current in breaker ratings...unless you put a transformer into the circuit

-Jon

Yeah, that I have seen on breakers.