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Answer for USA, Canada and countries running a 60 Hz supply service.


Do not use 2 conductor with ground cable to feed a 3 prong 120/240V dryer outlet. The outlet is ungrounded, and the third conductor is neutral not ground. Your ground wire must be sheathed by code. You cannot use the bare neutral conductor as ground.

Another answer

You should not connect a three wire circuit for a dryer to a sub-panel, it should go all the way back to the main panel. The code never allowed a three wire circuit with a bare neutral to go to a sub-panel. By connecting the three wire cable to the sub-panel you take the chance of energizing the enclosure for the sub-panel if something were to happen to the grounding conductor from the main panel. Four wire circuits were required for dryers anytime they originated from a sub-panel, now the code requires all dryer circuits to be four wire: two hots, neutral and grounding conductor.


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.




2011-05-14 03:01:18
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Q: On a older clothes dryer that has a three-wire cord where does the bare wire connect in the subpanel - on the neutral buss or the ground?
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Related Questions

Is the neutral bus bonded to the equipment ground in a subpanel?

Neutral and ground are only bonded at the main panel, not subpanel.

Where is the only place the neutral and ground wires can be on the same buss bar?

The main electric panel is where neutral is bonded to ground. There is usually a screw or strap that connects the two so the same type panel could be used as a subpanel and have the neutral and ground unbonded in subpanel.

How do you connect a 20 amp subpanel to 30 amp generator?

Your 20-Amp panel would need its own 20-A "main breaker", probably in 240-volt, 2-pole configuration. You wire the black and red in the generator cord to the two circuit breaker poles, the white neutral to the neutral bar in the subpanel (which must remain ISOLATED from the metal panel), and connect the grounding wire to the grounding lug on the panel. Do NOT connect generator neutral to any grounding bar; neutral and ground can only be connected at the main (service) panel. All subpanels must have their own grounding rod as well, and the generator may need its own.

Can the neutral wire and the ground wire be connected to the same bus bar in a subpanel?

No, with some exceptions, the equipment ground is kept separate from the neutral in a subpanel so that the equipment ground doesn't carry neutral current. This prevents the equipment ground from carrying neutral current. If it did the resistance of the wire would develop a voltage in proportion to the neutral current, and then equipment ground would no longer be at ground potential. There is a different answer if this is a subpanel in a different building and some additional conditions are met, or if this is related to a separately derived power source. See the National Electrical Code for complete information.

How do you connect the wires for a 200 amp sub panel to a 200 amp main panel?

You would generally use a cable with the necessary ampacity for the maximum load to be handled over the distance from the supply drop to the furthest utilization point. The cable (or conduit) would generally have two hots, a neutral and a grounding conductor. If the subpanel is in a different building, other rules will determine whether the subpanel needs an isolated neutral bar or its own grounding rod for the grounding bar.

When wiring a 120V outlet from a 240V 3 wire service can you just connect the neutral white to the middle wire of the 240 and grab a ground from another source?

The 240 transformer that delivers power to your home has a "center tap", which gives 120 VAC to each side from the center and 240 from "hot" to "hot". It sounds like you're describing it correctly. Use the center tap and one of the hot lines to give you 120VAC, and there should be a ground bar inside the breaker panel that you would use to provide ground to the plug. The neutral and ground may or may not come from the same "source", depending on what you're trying to do. If you run a 240 feeder to a subpanel in a separate building you run two hots and a neutral and you put in a separate grounding rod to connect to the ISOLATED ground in the subpanel. The neutral and ground are not allowed to be connected together in that configuration. If you're running a 120 circuit instead, you run hot, neutral and ground together from the main panel to the subpanel.

Do you need a grounding rod at a subpanel on a detached building?

Yes. The panel must be grounded with its own grounding rod. The ground will not be provided with the feeders to the panel, these will only contain your phase wires and neutral. Also make sure that any subpanel installed does not have the neutral bonded to ground. This should only be done at the main panel where the electrical utility service is connected.

How do you put on a four prong outlet on a roper electric dryer?

Black &amp; Red are hot, and White is neutral. If it has no place to connect neutral connect neutral to ground.

How do you connect elcb in single phase supply?

very easy connect the live or phase to the marked on terminal and neutral which is necessary to the marked neutral

How do you wire 2 50 amp sub panels from existing 100 amp panel?

You put two 50Abreakers in the 100Apanel and feed each subpanel with conductors from one 50A or the other (i.e., two hot conductors, a neutral and a grounding conductor). There are specific rules about whether the subpanel may need its own grounding rod connection as well, depending upon whether it's in the same building, among other things. You may optionally place another 50A breaker in each subpanel as a "main disconnect" for circuits fed from that subpanel.

In a home circuit are the neutral and ground bare wires always connected?

They are always connected, but at one and only one place, the service entrance. For instance, if you are adding a subpanel to an existing house, the subpanel will probably come with the ground bus and the neutral bus tied together with a special bonding screw. To be legal, you must remove this screw, isolating the neutral from ground. The house's main panel still has the bonding screw or jumper in place, and remains the only place the connection is made.

What happen when neutral connect to live?

short circuit

How do you wire into the main power supply when installing a 50 amp electrical box for a small shop?

Ideally you need two open breaker locations adjacent to each other. Install a 2-pole breaker to supply 120/240 volts. Rating of breaker should 50 A to subpanel. Do not bond neutral and ground in the subpanel.

What was the colors of the clothes in jesus time?

Neutral colors.

Do cotton clothes get more charged than nylon clothes?

No, because cotton is relatively neutral

Where do you connect the white wire from the shunt breaker?

Connect to the circuit neutral wire which should also be white.

How does a phase leg connect to a neutral in an electrical circuit?

A phase leg connects to the neutral through the connected load.

Why nuteral is earthed in generator?

lets take an e.g. to answer it try to connect your neutral wire to earth .you will get exact 210-220v This is because neutral is not exactly at zero due to the Resistance of the wire from source to our home. now if we connect the neutral to earth the neutral become exactly zero and we get full supply.

Does 3 phase need a neutral?

As far as I understand, you don't need neutral line for connecting appliances that is 3-phase compilant. You only need the neutral line to connect a single phase appliance, which you connect along with one of the three lines.

Where do you connect the speaker ground wire?

remember the + side of the speaker basically means neutral, in all electric projects the - is always the live line, so if + means neutral that basically means that ground would also be neutral, speakers dont need ground, so if u wish connect + with neutral on the speaker.

What size wire do you need for a 125 amp sub panel 30 feet away from a 150 amp main panel?

A 125 amp panel or subpanel requires # 2 gauge feeders and neutral. (# 2 awg is rated for 130A) However, depending on the existing load in your main 150A panel you likely don't have enough power to operate a 125 Amp subpanel.

If we connect Fuse wire to neutral how will it affect safety?

prepare to fry

Which side of the White neutral wire do you connect the Black power wire?

The neutral wire and power wire are never connected together.

Bypass neutral safety switch?

To bypass the cars neutral safety switch, you need to find the two wires to the safety switch and connect them together. It can also be done by putting the car in neutral.

How do you put rangerover sport in neutral when battery is flat?

Jumper cables from another vehicle or charge the battery. As soon as you connect the charger you can put it in neutral.