120 Volt UPS Panel

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blues

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I have UPS design that has a remote by-pass switch with an output circuit to a 120 Volt panel. I would like to take a 120/240 volt panel and tie bus A-ph and B-ph together to make 120 Volt. I just don't know if this allowed by the NEC. Any suggestions would be greatly appreciated.

Dan Craven
 
blues said:
I have UPS design that has a remote by-pass switch with an output circuit to a 120 Volt panel. I would like to take a 120/240 volt panel and tie bus A-ph and B-ph together to make 120 Volt. I just don't know if this allowed by the NEC. Any suggestions would be greatly appreciated.

Dan Craven
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This would be allowed as long as you label the panel correctly so that nobody thinks that they could get 240 from a two-pole breaker. :)
If the panel has a main CB, you would have to take some extra precautions not to overload the panel bus or the feeder. You would in effect be paralleling two CBs.
 
GoldDigger said:
This would be allowed as long as you label the panel correctly so that nobody thinks that they could get 240 from a two-pole breaker. :)
If the panel has a main CB, you would have to take some extra precautions not to overload the panel bus or the feeder. You would in effect be paralleling two CBs.
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You would be in danger of overloading the neutral bus but not the L1 or L2 bus.
 
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