tapping off 3 phase to 1 phase

Thread Starter

mvtop

Joined Oct 5, 2009
3
Hi,
I have a question about using 3 phase.
This is what i have:
I have some AC condensers positioned on the outside of a building with the cutoffs close by. The AC's are all 3 phase.
I need to grab some 120v 1 phase power and run a few circuits. The cutoffs for the AC are in a good location to grab power from.
So, can I use a leg of the AC power to run a circuit if I’m not overloading the circuit?


thanks.
MV.
 

MikeML

Joined Oct 2, 2009
5,444
Single phase power is usually taken line to line in a three phase delta feed. It is usally take Line to Neutral in a Wye feed. You need to figure out what you have...
 

gerty

Joined Aug 30, 2007
1,276
The 3 phase going to the ac units probably doesn't have a neutral, which
you'll need to get the 120v. If you use the ground as a neutral, that would be a code violation. All of this is assuming you're in the US.
 

Thread Starter

mvtop

Joined Oct 5, 2009
3
thanks for the replies.
but after looking at this again, and the time spent hacking this into subbmission, it would be just as quick to pull a few new circuits and would up to code.

thanks.
MV
 
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