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If you have a four-prong 240V outlet can you switch the outlet to a three-prong 240V outlet?

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2015-07-16 19:27:33
2015-07-16 19:27:33

The 4 prong receptacle should be more in line with the latest wiring code. It is best to change the plug or the cord on the appliance you wish to use. If you have a 4 prong outlet, the purpose is to isolate the neutral from the ground.

There are numerous examples mentioned in Wiki s but they all amount to requiring that there be no link between the neutral terminal of the device [appliance] and the frame.

It is, however, allowed [by the NEC, unless disallowed locally by the "authority having jurisdiction"] to install a link to the neutral terminal from the chassis if there is already a three prong outlet existing.

ALWAYS CHECK WITH YOUR LOCAL WIRING SAFETY OFFICE BEFORE YOU ATTEMPT TO CHANGE ANYTHING ON POWER MAINS OUTLETS

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS.

If you do this work yourself, always turn off the power

at the breaker box/fuse panel BEFORE you attempt to do any work AND

always use an electrician's test meter having metal-tipped probes

(not a simple proximity voltage indicator)

to insure the circuit is, in fact, de-energized.

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Related Questions


Yes, you can plug a 240v motor into a 230v outlet.

Yes, it can be and there is no problem at all Because most of the electrical appliances are made to work on 220v - 240v so it can also be plugged into a 240v outlet.

What is your question? A standard outlet is 110V. A 220 outlet is shaped different so that you know it is 220. You would never run 220 through a 110 outlet.

to turn on a 240v or480v system,like a 240v waterheater

You can, but be advised that whatever you plug into the new outlet should not exceed 5000W capacity (20A x 250V = 5000W)or you could risk overheating the new outlet with serious results. To prevent this, you should make sure the circuit breaker is a 20A also.

If you don't know that then you shouldn't be messing around with electricity. It's dangerous.

The two are effectively the same; so Yes.

Not only will it work, but it will last for much longer than if it was connected to 220volts!

If the 220V circuit is dedicated, is to derate the circuit to a dedicated 110V outlet. Replace the 220V breaker with a 110V breaker and install a 110V outlet in place of the 220V outlet. If the original circuit was 20A or greater go with a 20A breaker and a 20A outlet as Airconditioners are fairly large loads. Do not exceed the current rating of the old circuit as that is all the current the existing wiring can handle.

An existing outlet can be converted by replacing the 30A circuit breakers or fuses in the circuit breaker or fuse box with 15A breakers or fuses. The 30A outlet should also be replaced by a 15A outlet. This is all that is required if the wire from the supply to the outlet is 10, 12, or 14 guage. The existing wire should be 10 guage wire to handle the 30A and there will be no problem in the same wire providing the 15A.

Yes, but you will only get one quarter of the wattage from the heater.

You might be able to plug in a 240V American oven range into a European outlet depending on the type of plug. SomeÊAmerican high-powered appliancesÊhave 3 or 4 pins, which may require adapters to plug into European outlets.

No. You'll need an adapter that can change voltage.

You cannot use 2-120v outlets to power a 240v dryer. You can convert a 240v dryer outlet to power 2-120v outlets if they are supplied with a neutral. This requires a competent electrician. Do not do this yourself.

Yes. Generally 240V is actually 220V when it reaches a wall socket in any case: (DO NOT TRY AND RUN 110V EQUIPMENT ON 240V SUPPLY THOUGH)(from http://www.faqs.org/faqs/electrical-wiring/part1/section-14.html)

If I understand your question, Can you run a 110 appliance off of a 220 volt outlet? You could by only using one leg of the 220. You may also consider changing the outlet. Put in a regular 110 outlet and capping off one leg of the 220 in the wall box. You still have a neutral and a ground to work with. I read this as the questioner doesn't want to modify the outlet. Check the voltage ratings on the device. Many electronic devices nowadays can havdle 120V or 240V as it is cheaper to manufacture one powersupply and sell it everywhere. If your device is rated for 240V, you can put a 240V plug on it. If it only says 120V, no dice. 240V will burn it up.

lamp go "POOF!" It may be very bright, but not for very long!

no a 240V switch rated at 30amps may work ok but could be a problem with a motor or coil if the switch is not dc rated chances are the 240V switch opens far enough to break a 30 amp arc, even if its not fast enough

Yes and you will have a spare terminal for future use


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