3 phanel used as single phase

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cvirgil467

Senior Member
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NewYork
last minute project changed - everything is installed - i now have a single phase feeder feeding into a three phase panel. Technically everything will work. Panel ampacity, short circuit, and voltage ratings are ok. Connected load are fine too. Codewise, can i do this?

Thanks.
c
 
cvirgil467 said:
last minute project changed - everything is installed - i now have a single phase feeder feeding into a three phase panel. Technically everything will work. Panel ampacity, short circuit, and voltage ratings are ok. Connected load are fine too. Codewise, can i do this?

Thanks.
c
Click to expand...

It is possible to make work but not good practice, and 110.3 (B) would come into play
 
Gregg Harris said:
It is possible to make work but not good practice, and 110.3 (B) would come into play
Click to expand...
My biggest concern would be that you connect only to one phase bus in the panel rather than to all three if you want to avoid the possibility of later users overloading the feeder or the neutral. (See above.) And that would leave you with spaces between breakers that would have to be filled.
You say that the load calculation works out. Have you given any thought to future loads?

Is this an MCB or MLO panel?
 
There's no issue here. Remove the center lug on the bus bar if you wish. You'll have to install blanks in every third space but that's given. If panel has bolt on fingers remove every third one. Label panel for single phase. Costly mistake on somebody.
 
Depends on panel construction. Take Square D I Line panels for example. The panels are only made with three buses, if you are going to use for single phase only you need to make sure the breakers you use are designed to plug on to the two buses you will be utilizing.
 
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