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Answered 2015-07-15 18:28:54
for USA, Canada and countries running a 60 Hz power supply service.Running single conductor wire with two-wire cable for a three-way switch is illegal.

(LIFE SAFETY WARNING! [disclaimer]

Electricity is dangerous!

You can be injured or killed!

Improper installations can cause fire, injury and death!

Should you be doing this yourself?)

This is one of those questions - if you know this little, you shouldn't be doing what you are planning...

No disrespect intended, but this is SO basic that it suggests you have not studied the subject at all!

The practice of running an additional conductor along with the cable to give you enough wires for a three way is illegal and unsafe.


Install three conductor cable with ground.

For information on how to hook-up one light with two on-off switches, see the Related link "How to wire a 3-way switch, including a wiring diagram", shown below.


By asking this question you are probably not quite ready to take on this particular task. The correct answer to your question will depend on the exact locations of the switches and the switched fixture, its voltage and its power rating.

If you get any other answer here, you might attempt to do something you shouldn't be doing, and that may cost someone a shock, a home fire, or even their life.


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.




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Can you use single conductor 14 gauge wire to wire a three way switch?

The key is the protection of the wires. If you are using single wires you will need a conduit of some sort. Don't just run the single wires in the wall. Multi wire Romex or metallic shielded cable are used to provided added protection to the encased conductors.

What gauge wire is romex?

Romex is a manufacturer's wire cable trade name and not a wire size.

What is the difference between thhn and romex?

THHN Is used in conduit, Romex is not.

How do you wire a light and switch with the 2 wire old romex?

with a standard 1 pole light switch (one switch operating the light) it is black wire to black wire and white to white (non grounded)

How many watts and romex gauge is safe for a 15amp breaker?

Assuming 120 VAC in a residence maximum watts = 15 x 120 = 1800 Watts. For a continuous load you can support 1440 watts which is 80&amp; of maximum. You need 14 AWG gauge wire.

Can you add 14-2 romex wire to old house wiring?

Yes, if the existing wiring you are adding to is 14 gauge. If it is 12 guage then you must use 12 gauge. If you are running wire from the service panel it is fine as long as you install a 15 amp breaker.

What is Romex wire?

ROMEX&reg; is a federally registered trademarked brand of non-metallic sheathed electrical cable originally developed by the former Rome Wire Company in 1922. The ROMEX Brand is now owned and produced by Southwire Company.

How do you wire a three-way switch when the power supply is in the light box?

to wire a 3-way like this you first need to run 14/3 romex wire from the light box to each of the 2 switch locations. at each switch connect wires as follows: white wire to common screw(usually black or brass) connect red and black wire to silver colored screws, does not matter which way. in the light box you need to identify you incoming power, once you have identified that wire connect one of the white wires from the new 14/3 romex to it,secure with wire nut.the red and black in each 14/3 romex are connected red to red, black to black. this should leave you with one white wire frm a 14/3 romex, this connects to the black wire of your light fixture, the white of your light fixture connects to the white of the incoming power wire.

What size romex for 5000 watt dryer?

Assuming 220 volts service 5000/220 = 22.72 Amps. That equates to 10 AWG Romex.

What wire is commonly used in house wiring?

Romex, All you have to do is go to a hardware store and tell them you need house wire. It comes in a box. I am not sure how many feet. If you are just looking for the gauge, they will know that too.

What is the amp rating for 12 gauge wire?

In normal residential use it is 20 Amps. That depends on alot of things such as the wire insulation, ambient temperature, etc. Standard NM 12/2 (Romex or equivalent, which is likely what you are asking as it is the primary type used to wire residential) is rated for 20 amps, 14 gauge is 15 amps, 10 gauge is 30 amps.

What is the amp rating of 12 gauge wire?

In normal residential use it is 20 Amps. That depends on alot of things such as the wire insulation, ambient temperature, etc. Standard NM 12/2 (Romex or equivalent, which is likely what you are asking as it is the primary type used to wire residential) is rated for 20 amps, 14 gauge is 15 amps, 10 gauge is 30 amps.

What is the difference between THHN and romex wire?

THHN is a heat resistant thermoplastic insulated conductor, usually a single conductor. Romex is a brand name for a nonmetallic sheathed cable.

What is the proper name for Romex?

NM (Non Metallic) Cable.

Can a remodel job be wired with romex if the home is wired with conduit?

Yes unless there were some overarching electric code reason why conduit was used in lieu of Romex. if in doubt ask an electrician.

Does the National Electrical Code permit 2 wire Romex stapled on edge?

The National Electric Code requires any Romex to be stapled at-least 1.25 inches from the edge of a stud.

What is the difference between romex 14 2 14 3?

In romex, 14-2 means two conductors, 14AWG each, and 14-3 means three conductors, 14AWG each. Note: Normally, romex has a ground, so the designation is more likely to be 14-2/G or 14-3/G.

Is romex wire copper or aluminum?

Standard Romex is a three-strand, solid core wire, individually insulated, in a common sheath to make it easier to pull. For a short time, some manufacturers were making romex with aluminum because the cost of copper was so high, but the aluminum wire was not as good as the copper, and the practice was discontinued.

What year did romex wire come out?

The exact year that Romex Wire came out is not listed on their website. However, they do say that they have been selling the wire for over 88 years. I have found the year 1926

What are wires covered in?

The wire is covered in a rubberized plastic and it called Romex

Is Romex in conduit allowed?

Yes. The NEC Does not specify either way.

Can 20-amp circuits use number 12 and number 10 Romex wire?

12 guage wire israted for 20 amps and 10 guage is rated for thirty amps! 12 gauge is what is required, as it is rated for 20 amps. 10 gauge is rated for 30 and will be more then enough. Oversizing wire in your case isn't necessary. The thicker 10 gauge wire is harder to work with and will more then likely cost more.

Can you run Romex through a wire mold?

The key is that you don't want to cause over-heating in wire. The answer is you can probably do what you want unless it involves high current and a small cross section in wire mold such that the Romex could generate too much heat. You could always strip out the wires inside the Romex and just run them in the wire mold.

Do you need 3-wire romex to feed bedroom ceiling box by electrical code?

No, you can feed it with a 2 wire Romex + ground. It depends on what is mounted on the ceiling. If it is just a light all you need is 2 wire + ground Romex. However if it is a fan/light and you want to control each one independant of the other you will need to use 3 wire Romex + ground. This is of course if you have 2 seperate switches. You would then connect the red wire to the blue light wire and the black wire to the black fan wire. If you use 2 wire Romex just connect the blue and black fan/light wire to the black wire in the ceiling box.

Can you use a 2-wire romex to hook up 3-way switches?

You need three wires and ground between switches and a pair for supply and one for load. Google 3-way switch wiring for a diagram.

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