220v from (2) 110v circuits

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Forum topic by Randy_ATX posted 01-17-2015 08:30 PM 1416 views 0 times favorited 11 replies Add to Favorites Watch
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881 posts in 2679 days

01-17-2015 08:30 PM

Found this:

I’ve got a finished garage and I will likely be moving in a few years, so I don’t want to cut into the sheetrock near the panel to get a dedicated 220v outlet installed.

What this guy came up with in the video seems to fit the bill perfectly (the need for occasional 220v), but before proceeding, I wanted a little feedback from others.


-- Randy -- Austin, TX by way of Northwest (Woodville), OH

11 replies so far

View Fred Hargis's profile

Fred Hargis

5236 posts in 2730 days

#1 posted 01-17-2015 09:32 PM

I didn’t watch the video (other than the first 10 seconds) but it’s easy to envision what he did. What is the real question? It will work, along as the 2 120V legs are on opposite sides of the panel. Is it safe? Well, a 240V breaker trips both legs when 1 is short; if you use 2 120V circuits you won’t have that circumstance, so one leg will still be hot if some problem occurs. My opinion: tearing into sheet rock isn’t that big a deal (if that’s the only deterrent),

-- Our village hasn't lost it's idiot, he was elected to congress.

View MrUnix's profile


7106 posts in 2436 days

#2 posted 01-17-2015 09:46 PM

What Fred said… 220v is just two individual 110v circuits on different legs in the panel. Kind of depends on where you want the outlet though. I put a dedicated 50A outlet next to the panel (which is in my garage) for my welder. All that was required was cutting the hole for the outlet box and then fishing the wire over to the panel a couple of feet away. No patching or other ‘repairs’ needed after installing. Alternatively, if you have an electric clothes dryer nearby, you can use it.. typically they are 220V@30A.


-- Brad in FL - In Dog I trust... everything else is questionable

View klassenl's profile


194 posts in 2896 days

#3 posted 01-17-2015 10:03 PM

Well, it will work. But it’s a code violation about 10 times over and not very safe.

-- When questioned about using glue on a garbage bin I responded, "Wood working is about good technique and lots of glue........I have the glue part down."

View pjones46's profile


1001 posts in 2880 days

#4 posted 01-17-2015 10:03 PM

+1 Brad

-- Respectfully, Paul

View bondogaposis's profile


5151 posts in 2588 days

#5 posted 01-17-2015 10:08 PM

Sheet rock is very easy to repair, I wouldn’t let that deter you from making a safe and sane 220 circuit.

-- Bondo Gaposis

View Randy_ATX's profile


881 posts in 2679 days

#6 posted 01-17-2015 10:38 PM

Thanks Fred, Brad, all…

It didn’t take much convincing to talk me out of it – that’s why I posted it here.
I give electrical as much respect as I do tablesaws, routers, jointers, etc…
I just pulled my panel off and took a couple of photos. It looks like I have just enough room for 1 220v breaker.
This panel is a sub panel, my main panel with all the other 220v breakers is on the outside of the house.

-- Randy -- Austin, TX by way of Northwest (Woodville), OH

View Planeman40's profile


1330 posts in 2998 days

#7 posted 01-18-2015 01:10 AM

There is a little more to it than just ANY 120 V circuits.

The two circuits MUST BE 180 DEGREES OUT OF PHASE WITH EACH OTHER. This can be illustrated using two sine curves super composed, one on top of the other. I could easily illustrate the idea to you graphically, but its is difficult to do in in words.

-- Always remember: It is a mathematical certainty that half the people in this country are below average in intelligence!

View TheFridge's profile


10816 posts in 1723 days

#8 posted 01-18-2015 01:16 AM

Just stick a double pole breaker in there. You can leave yourself more room if you use a GE 1/2 size double pole instead of a standard double pole.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View bonesbr549's profile


1579 posts in 3304 days

#9 posted 01-18-2015 02:35 AM

Jeez man its a little sheet rock. It will cost you 20 bucks in materials to open an acess and patch it back in. Your gagging at a nat and swallowing a camel.

Do it safe and do it to code.

-- Sooner or later Liberals run out of other people's money.

View ChuckC's profile


843 posts in 3172 days

#10 posted 01-18-2015 02:35 PM

Another issue with the guys idea is that the 2 breakers for a 220 line are supposed to be bound together mechanically so if one trips they both trip. There’s no way to do that here.

View gtbuzz's profile


427 posts in 2679 days

#11 posted 01-18-2015 04:53 PM

As others have pointed out, with the actual 220 breaker, you’ll trip both legs at the same time. That’s not possible using two separate 110’s and is just asking for trouble.

One thing I hate doing more than just about anything else in the world is drywall repair. It sure beats the hell out of fire damage that your insurance company won’t cover from doing something like this. Glad it sounds like you’ve decided against this.

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