67 votes

Can I use 220 V outlets on a 15 ampere breaker and wire it up as 110 V?

Send it back right now You bought it off Amazon Marketplace, the world's biggest junk shop. A step down from eBay, even, because this garbage hides amongst legitimate products. Here. See what you ...
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61 votes
Accepted

What is a tandem breaker (aka duplex, cheater, twin, double-stuff, etc.)?

It starts with spaces in the panel A service panel has a basic unit I call a space. That's apparent when you look at the "knockouts" on the cover. Electrical power in North America delivers split-...
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37 votes

Why would replacing this 240 V outlet with a 120 V outlet trip my breaker?

You can't do that! Don't switch any wires. That a 240 volt outlet, a 120 Volt line to each of the two brass screws and a ground on the old outlet. You plugged a 120 Volt appliance into a 120 Volt ...
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  • 55.1k
33 votes
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Can I safely plug a 15A 100V appliance into a 20A 250V wall outlet?

No. That is a NEMA 6-20 receptacle. Your NEMA 5-15 appliance is specifically designed to not plug into it. Because it would destroy the appliance if you did. That is why the system of plugs works ...
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28 votes

240 V outlet is not delivering 240 V

I bet if you go to your service panel, you're going to find a completely full service panel, and a unique creature we call a "double-stuff breaker". Quite likely the landlord does his own electrical ...
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27 votes

Why would replacing this 240 V outlet with a 120 V outlet trip my breaker?

This could have easily been done correctly if you had done the research beforehand that you are doing now... as things are, you have created a 120V socket that is supplying 240V... it did fry your ...
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25 votes
Accepted

Do travel voltage transformers really not have grounding?

All this stuff is cheap Cheese junk You describe a genre of travel transformers, not just a specific one... but who's kidding who? The "genre" you're talking about is "the infinite ...
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18 votes

Should I run 240v for any supported appliances?

There's no need to do this for computers/networking gear/... While the switching power supplies used in IT equipment are slightly more efficient when running on 240V vs when they are running on 120V, ...
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18 votes

Why would replacing this 240 V outlet with a 120 V outlet trip my breaker?

Just to make it clear, in simple language, since some of the other answers are rather technical: The outlet is just a connector - it just lets you plug in cords to the electricity supply. It doesn't ...
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17 votes

Can I use 220 V outlets on a 15 ampere breaker and wire it up as 110 V?

Send it back and get something that's listed for the job While what you have is indeed a 120V outlet (the outlet configuration governs, not some text in a manual somewhere), this outlet is not usable ...
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15 votes

Replacing 240V outlet with 120V

It can be done, but you'll have to swap out the breaker. A "standard" US receptacle is rated for 125 volts, and 15 or 20 amperes. So you'll be going from a 30 ampere double pole breaker, to ...
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  • 128k
15 votes

Should I run 240v for any supported appliances?

For ordinary residential usage, there is generally no need (in the US and other 120/240 areas) for 240V except for: HVAC Electric Dryers Electric Water Heaters Electric Car Chargers Electric Ovens ...
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14 votes

Does running a dryer on 120 V drive up electricity costs?

Not an immediate danger, but quite a few problems According to the spec sheet, this dryer is rated for 240V, 30A. Running it on "120V outlet" in the US normally means either 15A or 20A. ...
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13 votes
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What is the explicit difference between the ground and neutral wire in 110V systems?

Grounding The bare copper (grounding) conductor is a safety system that provides an effective ground-fault current path, and should only ever have current it in the event of a fault. It provides a low ...
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  • 128k
13 votes

240 V outlet is not delivering 240 V

One possibility is that the two hots, labelled X and Y, are on the same line or leg of the service. The 240V electrical service typical in the US is a three wire Edison circuit, with two of the ...
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13 votes

Do travel voltage transformers really not have grounding?

TL/DR: there is no way this abomination is certified to any of the usual standards like UL. If a device that requires Earth is plugged into that, it won't be safe. If they ignore such basic safety ...
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  • 6,587
13 votes
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Can you use a 2 pole 2-slot wide breaker to provide 240V?

Oh boy...whoever did that work really botched it up good You need to call whoever rearranged those breakers back and tell them to fix their messed-up work on their dime, or better yet, pay someone ...
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12 votes
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Replacing 240V outlet with 120V

First you need to figure out the parts you need. Turn the power to the circuit off and remove the outlet. You need to figure out the gauge of the existing wiring. Since it is a 30 amp circuit, the ...
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  • 19k
12 votes
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Why does my electric oven present the option of 40A and 50A breakers?

There are a few different issues here: 120 vs. 240 A typical oven for installation in a system like the US (split 120/240) will use 240V for the heating elements (i.e., needs 2 hot wires) and 120V ...
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12 votes

Can I use 220 V outlets on a 15 ampere breaker and wire it up as 110 V?

This is a 220V outlet (note horizontal "live" slot on the right): And this is a 110V outlet (vertical "live" slot): Pictures valid in USA. Look at these two outlets. I recently grabbed a 110 ...
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  • 4,122
12 votes
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Electrical service sizing mix up in Mexico

Why 30A service? Because of provisioning. They are not able to provision 50A service at this time at this location. That is probably due to transformer or pole-line wire capacity in the ...
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12 votes

How wasteful is a voltage transformer?

The bigger problem is the transformer is going to set you back about $100, so it spectacularly fails to make sense for a $40 humidifier. Dollar for dollar, if you're coming to North America, you ...
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12 votes

Can I safely plug a 15A 100V appliance into a 20A 250V wall outlet?

At the moment NO. You have three choices: sell that device and purchase one that is rated 230V. get a 230 to 110 transformer. replace that supply and socket with one of 110V. Which of these is ...
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  • 21.3k
12 votes

Can you use a 2 pole 2-slot wide breaker to provide 240V?

Allow me to color in ThreePhaseEel's superb answer. First, you need to understand how panel busing works. Check that link for the basics, however, the tandem/quadplex concept does not apply to GE -- ...
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11 votes

In a multiwire branch circuit, can the two hots be connected to the same phase?

Yes, this does sound like a problem. Assuming your panel is like most, the breakers are on the same phase and you have two problems: No Common Shutoff MWBC is required to have common maintenance ...
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10 votes

What is wrong with this panel wiring?

I've labeled your image, to help you understand what's going on. Off to the left, the grounding electrode conductor enters the box and terminates at the grounding bar. The feeder coming in the top of ...
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  • 128k
10 votes
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Using a 30-amp tandem circuit breaker for a 120/240v circuit?

It sounds like you may be mistaken as to how this is wired, or that perhaps I'm just not understanding your explanation. As others have mentioned, it's not possible to get 240 volts from a single pole ...
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  • 128k
10 votes
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Why would a 120v circuit work without a neutral?

It's using the earth as a return path You really don't want to do that. Dirt doesn't conduct electricity very well. Your neutral is bonded to ground in your main panel. The power company's ...
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9 votes

Should I run 240v for any supported appliances?

It's funny, how perfectly handy people, who make things all the time, assume nobody makes anything or has Maker pastimes. Atoms are the new bits, as they say. Everything from Burning Man floats to ...
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8 votes

Using a 30-amp tandem circuit breaker for a 120/240v circuit?

What you have will electrically work fine, but it is not code and not safe for anyone working on these units. You need to replace those two twins with one of these:
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