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220 volts from two 110 volt extension cords ?

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220 volts from two 110 volt extension cords ?

Postby mpete53 » Sat Apr 15, 2017 10:48 pm

220 volts from two 110 volt extension cords ?

Is this a crazy idea?

The 220 volt service comes in on 3 wire, one natural and two hots . Connecting from either of the hots and the neutral will give you 110 volts and connecting to the two hots give you 220 volts.

To balance the load on the service feed, the breaker panel alternates between the two service hot leads while connecting 110 breaker. That means, if I take a extension cord and a volt meter, plug into one outlet, it should not be hard to find a second outlet feed off the other hot leg which would give me 220 volts. By plugging a second extension cord into that outlet and using an adapter that would only connect to the hot leg of each extension cord and their grounds and wiring them to a 220 socket I should get a 15 amp 220 volt outlet.

Is this a dangerous idea? I know no building electrical code would OK it, but as a temporary connection for a welder supply it would be nice.

What do you think?

Mark
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Re: 220 volts from two 110 volt extension cords ?

Postby Farmwelding » Sat Apr 15, 2017 10:57 pm

Ummmmmm...

Well that's interesting. I wouldn't do it. I'm no electrical expert but something seems wrong about that plan and in sure there is a good reason

But maybe someone thinks otherwise, doubtful but.
Is it not possible to get a 220 volt otherwise where you are?
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Re: 220 volts from two 110 volt extension cords ?

Postby Otto Nobedder » Sat Apr 15, 2017 11:13 pm

I can do it. I would rather not, and I won't tell you how.

Shortly, it's possible, but not really a good idea.

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Re: 220 volts from two 110 volt extension cords ?

Postby Popeye the old miner » Sat Apr 15, 2017 11:37 pm

It sounds like it would work...for awhile...it sounds like it would be dangerous as well...not thinkin it would be a good idea
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Re: 220 volts from two 110 volt extension cords ?

Postby WoodpeckerWelder » Sun Apr 16, 2017 1:11 am

I'm a pretty "redneck" kind of guy when it comes to getting a solution to a problem, and I know how to do just that, but like the others, nope. Not at my house or anyone else's. Best to run a sub - panel and wire it correctly.
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Re: 220 volts from two 110 volt extension cords ?

Postby sedanman » Sun Apr 16, 2017 6:45 am

Technically it "works". There are several problems with it in actual practice though. The breakers for each hot leg will not bother trip at the same time in event of a fault. In a residential setting, you're talking about pairing two 15 amp circuits, you're still only going to get 15 amps at 240 volts
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Re: 220 volts from two 110 volt extension cords ?

Postby Artie F. Emm » Sun Apr 16, 2017 7:59 am

The low amperage leapt to mind as a reason to NOT pursue this. A better idea might be to identify the 220 service you already have but may not realize. Many home kitchens have 220v 50a service for the electric range, and many home laundries have 220v 30a service for the dryer. If you have one of those you might gin up an extension cord to bring power to your work space. Or move your welding space to a place near your kitchen / laundry.

And warn your spouse first!
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Re: 220 volts from two 110 volt extension cords ?

Postby mpete53 » Sun Apr 16, 2017 8:41 am

I have a 30 amp 220 outlet at home. This idea is for those small outside jobs where 220 power is not available.

I have a dual voltage welder Everlast 160STH. I recently used it in the 110 volts mode feed by a long 100 ft 12/3 extension cord. Working with 3/16 plate with 3/32 6011, the machine made the welds ok but does not seem to have the same punch as when run on 220 at the same amperage. Starts were harder as was maintaining the arc. I know that my stick skills are rusty, but I had run some practice beads at home using the same on 220 and got better results.

so this rig would only be used to get 220 at 15 amps rather then run at 110 at 15 amps.

The concern of only one breaker tripping is a valid point. It would leave the machine with a 110 hot feed making what seems like a dead power supply really a hot 110 supply which could cause a danger. As for the welder I think that would not be harmed.

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Re: 220 volts from two 110 volt extension cords ?

Postby Poland308 » Sun Apr 16, 2017 9:03 am

For a few houndred bucks you can make a 100ft extension cord for 220. For 600-800$ you can buy a gas generator big enough to run that machine anywhere you can move it.
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Re: 220 volts from two 110 volt extension cords ?

Postby mpete53 » Sun Apr 16, 2017 9:31 am

If I was working at the same place all the time a 220 feed would be a good option, but I don't.

As for a generator, I have a 5kw with a 220 outlet but am hesitant to use that as a power supply since my welder is an inverter unit and have read they need a very clean power supply.

Have any of you used their inverter welder on a basic, non inverter generator?

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