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Participant

Join Date: Apr 2009
Posts: 3

3-Phase to Single Phase Distribution

04/27/2009 4:23 PM

Having a shop built , Contractor needs temporary power. business owner next door has a siemens P1 120/208y 3PH 4 Wire, 42 circuit sub panel I can come off of. I have 4 outdoor 100 amp 0816 main lug sub panels. Can I install a 100 2-pole breaker so I can feed my sub panels. Using 1/0 quad direct burial to first panel. Sorry for long message

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Guru
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#1

Re: 3-Phase to Single Phase Distribution

04/27/2009 8:35 PM

Possibly, but what do your local electrical regulations say regarding this matter. They will determine whether or not what you propose is legal where you are.

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Power-User

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#2

Re: 3-Phase to Single Phase Distribution

04/27/2009 11:33 PM

lirch12198; sure, you would have 208/120 volts at the 8/16 panels, 4 wire, for 2 hots, 1 neutral, 1 ground, with ground bars in sub-panels, is it a long distance from the owner, out to your panels? seems like plenty over size wire. perry

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#3
In reply to #2

Re: 3-Phase to Single Phase Distribution

04/28/2009 3:54 AM

Thanks for the fast response, it's 130' to the first sub panel, then 100' apart for the remaining three. yes I added the ground bars, wich don't come with the panels of course. Also pounded in a 5/8" 8' long copper ground rod for each panel. That was fun.

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Power-User

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#5
In reply to #3

Re: 3-Phase to Single Phase Distribution

04/28/2009 3:33 PM

lirch12198; it sounds like 1 100 amp breaker for all 3 sub panels, right? you could add a 5 terminal watt hour meter at your supply source. perry

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Participant

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#6
In reply to #5

Re: 3-Phase to Single Phase Distribution

04/28/2009 4:47 PM

Thanks everybody for the fast response, 100 amp breaker for, 4 sub panels. The meter great idea. The owner will like it.

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Power-User

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Location: US - TEXAS
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#4

Re: 3-Phase to Single Phase Distribution

04/28/2009 7:29 AM

Sure you can. What will the other owner say though when he gets his utility bill? Also make sure your temp power doesn't overload the mains.

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GRAY HAIRED OLD GOAT (1); jack of all trades (1); lirch12198 (2); perry (2)

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