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for USA, Canada and other countries running a 60 Hz supply service.Some appliances, especially older ones, don't have a ground wire. Also, a lot of wiring circuits in older houses were installed without using a ground wire to each socket outlet. They just ran a hot and a neutral wire. The neutral wire is grounded at the breaker panel.

On the breaker panel the 3rd wire - colored green or just bare - is the Ground wire. It is there to protect circuits - different to the one you are looking at - which need to have a ground wire as well as a neutral. On such circuits, in case of a fault condition in the appliances connected to them, a short circuit is sent to ground so that the circuit breakers on the hot wires should then trip to break the power supply to such circuits and stop a house fire or someone getting killed by electricity.

This is not a full answer to your question. You still have to think about which types of appliances - having plugs with only 2 prongs on their flexible cords - are still quite safe to use and which types are definitely not safe to use with that type of socket outlet - and in that situation, what should be done to make them safe?

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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.

Before you do any work yourself,

on electrical circuits, equipment or appliances,

always use a test meter to ensure the circuit is, in fact, de-energized.

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS.

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Q: Is it safe if there are 3 wires black white bare copper at your breaker panel but only 2 wires at the wall socket outlet?
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What size wire for a 40 amp breaker?

A 40 amp breaker is used in conjunction with AWG # 8 copper wire. The black and red wires are connected to the breaker. The ground wire is connected to the ground bar and the white wire is connected to the neutral bar.


Do you need a 20 amp single or double pole breaker for your washer?

Washing machines in the U.S. operate on 120 volts. That requires a single pole 20 amp breaker and wired with 12/2 w-ground wire. Black to the breaker, white to the neutral bus bar, and copper ground to the ground bus bar.


Do black wires always go to brass color screws?

In residential 120 volt wall outlet wiring yes the black always goes to the brass/copper screw. White is connected to the silver screw, and ground to the green screw.


What color wire is attached to the narrowest slot in a duplex receptacle?

I do not know what you mean by long slot. The bare ground copper wire connects to the green screw or the ground screw. The black wire attaches to the copper or gold colored screw and the white wire connects to the silver or chrome screw. Both the gold and silver screws are on the side of the outlet. The ground screw will be on one end of the outlet.


Why is the ground wire hot at all outlet boxes on a particular circuit?

Most likely the ground (green) wire is mistakenly connected to hot instead of the hot wire (black) at the breaker panel! Possibly you meant the neutral wire not the ground wire, in that case most likely the neutral (white) wire is mistakenly connected to hot instead of the hot wire (black) at the breaker panel! In either case check all three wires in the breaker panel for that circuit to make sure they are all correctly connected! Black is hot, White is neutral, Green (or uninsulated in some cases) is ground.

Related questions

What are the colors of the wires on a duplex outlet?

Black, white, and copper.


What side is hot in an outlet?

Black wire on copper colored screw. Neutral is White on a silver colored screw.


How do you connect a electrical outlet at home?

Black wire to copper screw, white wire to silver screw, bare copper ground wire to green ground screw.


How can you convert a 220 into a 110 volt power outlet?

The 220 volt outlet get remove and a 100 outlet gets installed. The wire hook up is the same. The breaker that feeds the outlet need to be change aswell from a double pole to a single pole breaker. +++ How does that work? If you convert a supply from 220V to 110V you would draw twice the current for the same watts, risking the wires overheating and causing a fire assuming the circuit-breaker didn't trip first. You'd need to change a lot more than the breaker too. My advice? DON'T!


What colour wire goes to the breaker using 12-2 wire?

Black. wire goes to breaker, white wire goes to neutral bar, and copper wire goes to ground bar.


How do you install a new pull chain light from a wall outlet?

very easy just pull your self a line from the outlet to the location you want to have the pull light fixture installed ,then connect the black wire to the black wire in the outlet white to the white and the copper ground to the ground then on the other end of the wire at the light fixture location connect the black to the copper screw and the white to the silver screw .and that should make it work with pull string .but make sure the circuit is turned off for that outlet location before you do the instillation


How do you wire a 220v connection into the main panel?

I assume you mean you are wiring a 220 volt circuit. You will install a 220 volt double pole breaker of the correct size for the circuit. An example would be for an electric dryer that requires a 30 amp double pole breaker wired with 10/3 wire. You connect the Red &amp; Black wires to the breaker. One on each screw. You now connect the White wire to the neutral bus bar in the service panel. Then connect the bare copper ground wire to the ground bus bar in the service panel. At the dryer outlet connect the black &amp; red to the hot screws, white to the neutral, and ground to ground. They will be labeled on the back of the outlet.


How can you wire a normal 120V outlet out of a double pole circuit breaker?

well, the easy answer is, black wire to one pole of the breaker, white wire to the neutral bus with all the other white wires, bare wire to the ground bus with all the other bare (or green) wires. BUT the breaker must be 20 amps or less for residential outlets and you much match the wire size to the breaker, #14 for 15 amp breaker, #12 for a 20 amp breaker AND if there is only going to be one outlet, if it is a 20 amp circuit, the outlet has to be rated for 20 amps. Yes, but why would you want to? It is unclear to anybody else what you are doing and therefore a hazard. Do it right. Use a single pole breaker designed for 110V.


How do you replace a 15 amp breaker in the circuit box?

The breaker will have a black wire connected to it. Turn off the main breaker and then disconnect that black wire from the breaker. The breaker will snap into the main bar. Remove the breaker and install the new one. Reconnect the black wire to the breaker and then install the cover and turn the main breaker back on.


Does the electrical wall outlet half to be same hook up as hook up at box?

Yes, black is hot, white is neutral, and copper is ground.


Is it safe to have two black wires two white wires and two ground wires on a single breaker?

Hopefully just the black wires are on the breaker. Two circuits on one breaker. Shouldn't be a problem. It would depend on how many outlets or lights were on the breaker in total. Even then, there is very little chance of something drawing current from every outlet at the same time. The only thing is you can't put two wires under one breaker (by code). You would have to wire nut them with a pig-tail then just put the one wire under the breaker.


What will happen if you plug in an overheated cord?

Usually the circuit breaker will trip or fuse will blow to open the circuit. There is some chance the if the breaker or fuse is rated too high the wire to the outlet socket could overheat and cause a fire.