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[wmccloud]

I recently ran across some new installed 277volt panels feeding 120 volt circuits, they were using 277 branch breakers no transformer or anything , is this up to code

 

[charlie b]

Do you mean to say that a single pole breaker in a panel rated for 480/277 volts, which is to say a 277 volt power source, is being supplied to a 120 volt load? If so, then (1) That violates NEC article 110.4, and (2) I am surprised that no fires have started or that no equipment has been destroyed. Are you certain of your facts?

Welcome to the forum.

 

[markstg]

I think he means he has 480/277 V rated panels being operated at 208/120V.
There is no problem with that.

 

[jim dungar]

It is not uncommon to see 277V breakers feeding 120V loads. This is often done to reach 'higher' AIC ratings at 120V.

 

[480sparky]

It is not uncommon to see 277V breakers feeding 120V loads. This is often done to reach 'higher' AIC ratings at 120V.

It may be common for Badger fans, but not Hawkeye fans as I have never seen it.

 

[jim dungar]

It may be common for Badger fans, but not Hawkeye fans as I have never seen it.

Actually I see it most often in the Minneapolis area, so it must be a Gopher thing.

 

[wmccloud]

its a 277 volt rated panel ,but they are feeding it with 120 208 voltage

 

[LarryFine]

Welcome to the forum! :smile:

its a 277 volt rated panel ,but they are feeding it with 120 208 voltage

That's perfectly okay. The other way around would be an issue.