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Old 07-17-2009, 06:35 PM   #1
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Adding a sub panel 250ft away from the main


Forum newbie here. I ran a search but didn't see a thread that quite matched what I was looking for.

I'm planning on adding an electrical sub panel to a garage approximately 250 feet away from the main panel. I already have 2 inch conduit with 2 ft sweeps running underground from the main to the garage. The main panel is a 200 amp breaker box with 4 empty spaces. My plan was to add a 100 amp breaker into the main box, use 2/0 triplex wire with two hot wires and one neutral and ground the sub panel at its location. There aren't any other services connecting the house to the garage. Inside the new shop I'd like to have the ability to run a 230 volt air compressor along with a dozen fluorescent lights and have a couple of breakers worth of 120 outlets. Should I proceed as planned?

thanks for your help...

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Old 07-17-2009, 06:51 PM   #2
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Adding a sub panel 250ft away from the main


Triplex leave you one wire short.

You need Hot, Hot, Neutral, Ground for this installation in most areas.

What I call Triplex has Hot, Hot, Neutral/ground

You also need a couple ground rods at the garage attached to the ground bus with a #6 wire.

You also need a main breaker at the garage.


Last edited by 220/221; 07-17-2009 at 06:53 PM.
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Old 07-17-2009, 08:25 PM   #3
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Adding a sub panel 250ft away from the main


So I add a bare ground wire to the triplex and tie it into the ground terminal on the main and the sub boxes?
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Old 07-18-2009, 10:35 PM   #4
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Adding a sub panel 250ft away from the main


No. The triplex has two insulated wires, and a bare wire, but the sub-panel requires a separate isolated neutral bus bar along with an insulated wire. That way the return sees only one path back to the pole transformer. So you need four wires, 3 insulated and one bare. Sub-panels have two bus bars.
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Old 07-19-2009, 02:56 AM   #5
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Adding a sub panel 250ft away from the main


Typically we don't pull triplex. We use individual wires, usually THWN, XHHW etc..

The power company uses triplex for their service conductors.

Feeders after the service generally need to be a 4 wire system with the hots and neutral insulated.
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