single phase on three phase breaker

[Gregc]

I need to pull a single phase from a source which currently has an existing three phase breaker available as a spare. Can I pull one phase load from the three phase breaker and still get the rated current capacity of the breaker? Would this practice violate the NEC or other standard?
Thank you

[junkcollector]

I take it you are installing a 120 volt branch circuit from a three phase breaker in a 208Y 120 V panelboard. I really don't see any issues as long as the breaker is sized correctly for the wire. I would certainly rather see a single pole breaker used if that is all that is required.

[Ohm1]

I take it you are installing a 120 volt branch circuit from a three phase breaker in a 208Y 120 V panelboard. I really don't see any issues as long as the breaker is sized correctly for the wire. I would certainly rather see a single pole breaker used if that is all that is required.


I agree!!!!!

[gpkull]

might i add if 240/120 delta dont use the wild leg. it should be orange in color to designate so.

[wyldewill]

Agree with all above, pull the breaker and fill the space with singles or blanks. But, yes it is fine otherwise. It is rated as the ampacity of each leg, you may remember when they let us "tie" breakers in the past, same thing, just a 3 phase will trip all phases, as tied breakes would not.