Being that the OP metioned that the panel is a single phase system, I doubt but not impossible I guess a delta breaker would even fit in the panel (different Breaker frames).
It would be a AHJ question by allowing a 3 pole breaker in the single phase panel. It would be a case by case basis. Personally I do not see why it would be an issue using a 3 pole breaker.
It is as safe or safer then a disconnect since it would be two power sources in the same diconnect which is not typical and with the added cost, you do not achieve anything. I would go as far labling the panel as 120/240 1 phase panel.
If a 3 pole breaker in a single phase panel throws the next guy/gal that goes in the panel, that is an indicator he/she is over their head and need to call someone who knows what they are doing.
Last edited by sparkyinak; 09/13/08 11:04 AM.
