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dcw 04-05-2012 10:23 PM

220v question
I have 110v in my detached garage. I need a new air compressor so I was going to get an electrician to wire it up for me. I was quoted $600 for the work. He told me to get enough 6/3 wire to run from my breaker box to the bottom corner of my house. He said from there he would hook that into a junction block and hook it to #6 to run in conduit out to the garage. I was wondering how he could do that with just the 1 wire #6? I have asked a second electrician and he said the same thing.

jbfan 04-05-2012 10:31 PM

6/3 is a cable with 3 insulated and one bare wire.
He connects these wire inside a junction box, and used induvidual wires inside the conduit to the garage.

Is the price just for labor, or is he suppling everything?

k_buz 04-05-2012 10:32 PM

He is going to splice a #6 THHN/THWN to each conductor contained in the 6-3.

dcw 04-05-2012 10:44 PM

he said just the one #6 in the conduit....
So you can splice the 1 wire to the 2 wires on the 6/3 then use the ground off the 110v?
I know how to hook it up if it was 6/3 all the way out. I'm just trying to figure out how this would work

k_buz 04-05-2012 10:46 PM

It wouldn't, you must be misinterpreting something.

To elaborate, if you spliced the black and red to a single wire, and the 6-3 was wired for 240V you would have an impressive boom.

joed 04-05-2012 10:48 PM

He is going to have to disconnect the current wires to the garage and replace them. You are only allowed one feed to your detached building. If the current feed is already #6 wires in conduit then he only needs to add one more wire to give you the 240 volts.

k_buz 04-05-2012 10:53 PM

is he trying to reuse the existing conduit?

dcw 04-05-2012 10:53 PM

yeah I must have. I will check tomorrow. He never checked my wires or anything though.

dcw 04-05-2012 10:56 PM

this guy is good. I probably misunderstood his whole plan.

k_buz 04-05-2012 11:02 PM

I'll attempt to explain it.

After you run the 6-3 you will have 2 hots, a neutral, and a ground to where the existing feed to the garage exits the house. The existing underground pipe has 2 conductors...a hot and a neutral. He will either pull out the existing wires and pull in larger conductors for the increased load or add one conductor to the existing feed to create a 120/240V multi wire branch circuit.

What I am curious about is why you would need 6-3. Is he installing a sub panel in the garage? What does the compressor draw?

dcw 04-06-2012 08:34 AM

he is putting 6/3 so if I ever get anything that draws more like a welder

joed 04-06-2012 10:05 AM

If you want lights to go along with the compressor you need a sub panel to create the different circuits.

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