First saying Hello, New Member here. I ran a #8 3 wire thhn (20ft) to my detached garage from my house panel that had to open spots. So I ran double pole 40 amp breaker so I could have 220 to the garage. I used 1 and 2 to the hot of the breaker and 3 to the ground of the panel in the house. I never used the bare ground wire at all. I hook the 1 and 2 to the hot of the sub panel is garage and 3 to the bus bar that the neturals from the 110 outlets go to. Everything is working great, but now I have a 4 wire oven I going to use for a powder coating project. I am asking do I hook up the two hots and put the netural on the bus bar and leave the ground from oven off?
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Question wiring to detached garage?
- Thread starter J00f150
- Start date
Aceman
Well-known member
This sounds like a mess.
Since you have one post to your name, I'll recommend you do a search in this forum on previous posts detailing how to properly wire a detached garage. It's been covered many many times, so I'm sure you shouldn't have any problem finding the info you're looking for.
Since you have one post to your name, I'll recommend you do a search in this forum on previous posts detailing how to properly wire a detached garage. It's been covered many many times, so I'm sure you shouldn't have any problem finding the info you're looking for.
Charles (in GA)
Well-known member
Your detached garage, by code should be fed with four wires, two hots, a neutral to an insulated bar, NOT bonded to the panel, and a ground wire to a ground bar that is bonded to the panel. If you did not do this, you did not do it according to any of the codes from recent years.
You need to hook the oven up correctly.
Charles
You need to hook the oven up correctly.
Charles
pattenp
Well-known member
Just asking.. do you have two ground rods at your detached garage? If you have one or none you need to have two. The diagram you posted only says you need one.
got it I will take care of it. I will hook up the bare wire to ground and hook the netural up correctly now, thanks.
you need to have a ground wire from the garage panel back to the house.
coolreed
Well-known member
You should have ran a four wire conductor to your detached garage for 220 VAC operation. Black, Red, White and Green conductors. That is code. The gauge of your conductors should be appropriate for the size load you are going to use. You are stating you are going to expect a 40A load. Then if it was me I would run at least a #8 4-wire copper conductor.
I strongly suggest you look at the National Electric code requirements for your area.
I strongly suggest you look at the National Electric code requirements for your area.
Speedy Petey
Well-known member
If using ground rods ONE rod is code. You only need two if you can't prove the 25 ohm resistance. Since very few of us have the $1200 tester to make this test we just install two.Just asking.. do you have two ground rods at your detached garage? If you have one or none you need to have two. The diagram you posted only says you need one.
I will say, in my area inspectors rarely if ever ask for the test/results.
pattenp
Well-known member
I'm very well aware that one rod is code if you meet the 25 ohm requirement, but common practice is to just use two. Our AHJ will ask for two regardless.
If using ground rods ONE rod is code. You only need two if you can't prove the 25 ohm resistance. Since very few of us have the $1200 tester to make this test we just install two.
I will say, in my area inspectors rarely if ever ask for the test/results.
VHF
Well-known member
Now that you have the correct 4-wire feed to your detached garage, did you make sure to remove the neutral-ground bonding screw in your subpanel? The neutral and ground should only be bonded in your main panel.