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A three-wire supply is used for a split-phase 120/240 v supply with two lives and a neutral. The voltage from each live to neutral is 120 v while the voltage between the two live wires is 240 v.
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∙ 9y ago
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∙ 12y agobecause you can you it in a three way switch that can be used in the bedroom and the hallway switch all basically going to the kitchen.
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Why is a red colored wire in a 120 volt circuit and what does it do?
It is used as a hot wire. <<>> In a three conductor cable set the third wire colour is red. In home wiring a three wire cable is used in a couple of locations. If the circuit involves a three way switching circuit, the cable between the two light junction boxes is fed with a three wire cable. Check the Internet for three way lighting connections. The other location a three wire cable is used is in split circuitry. Your kitchen counter receptacles use this method of wiring. The tie bar in the receptacle is removed on the hot (brass colour) side of the receptacle and the red wire is connected to the top brass screw and the black wire is then connected to the bottom brass screw of the receptacle. The white wire, as always, is connected to the silver coloured screw of the receptacle. Another example of using a three wire cable is to take two circuits from the distribution panel to two separate circuits on the other side of the house instead of running two, two wire circuits. The three wire cable is terminated in a junction box and two two wire circuits are feed from this junction box to the circuits that require power. The two two wire circuits will use the white wire of the three wire cable as a common neutral.
When wiring a house do you have to use the black wire as the hot wire?
No, there are different occasions when the red of a three wire cable gets used as a hot wire. There also times when the white wire gets used as a hot but has to be re identified as a hot with marking tape. When wiring baseboard heaters the cable used is red and black with no white wire in the set.
Can you use armored cable to wire 277 volt lights?
Yes.
What color is the hot leg of 12 2 120 volt residential circuit?
Answer for USA, Canada and countries running a 60 Hz supply service.There should be a clarification of what a three wire cable is. A three wire cable consists of three main wires and a bare ground wire. The wire colours are, red, black and white. In normal circumstances the red and black wires are used as "hot" conductors. The white in this cable set is usually used as a neutral.Two commonly used procedures for a three wire cable in home wiring are for kitchen counter split receptacles and the other is for the traveler cable connection between three way switching. Also in home wiring, larger three wire cables are used for the range and dryer connections.In larger square foot homes, circuits that are right across the home from the distribution panel are fed with three wire cables. This allows two circuits to be connected to the one cable much like the kitchen counter receptacles.Now if your definition of a three wire cable includes counting the ground wire, the electrical terminology of this cable is a two wire. In a two wire cable the black conductor is the "hot" wire.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 JOBSAFELY AND COMPETENTLYREFER THIS WORK TO QUALIFIED PROFESSIONALS.
What is the minimum ground wire size for a 20 amp 110 volt circuit?
The ground wire in a two or three conductor #12 cable is a #14 bare ground wire.
Why is a red colored wire in a 120 volt circuit and what does it do?
It is used as a hot wire. <<>> In a three conductor cable set the third wire colour is red. In home wiring a three wire cable is used in a couple of locations. If the circuit involves a three way switching circuit, the cable between the two light junction boxes is fed with a three wire cable. Check the Internet for three way lighting connections. The other location a three wire cable is used is in split circuitry. Your kitchen counter receptacles use this method of wiring. The tie bar in the receptacle is removed on the hot (brass colour) side of the receptacle and the red wire is connected to the top brass screw and the black wire is then connected to the bottom brass screw of the receptacle. The white wire, as always, is connected to the silver coloured screw of the receptacle. Another example of using a three wire cable is to take two circuits from the distribution panel to two separate circuits on the other side of the house instead of running two, two wire circuits. The three wire cable is terminated in a junction box and two two wire circuits are feed from this junction box to the circuits that require power. The two two wire circuits will use the white wire of the three wire cable as a common neutral.
How many wires are used to wire a standard dryer?
In North America you would use a three wire cable. A dryer needs two voltage supplies. A 240 voltage for the heating element and 120 volts for the motor and controls. The three wire cable will have a ground wire in it also but in North America this is not counted as it is not a current carrying conductor. The size of the cable will be a 3C #10.
Can you connect a car battery to a three wire cable?
Sure, just use 2 of the wires and ignore the 3rd one.
When wiring a house do you have to use the black wire as the hot wire?
No, there are different occasions when the red of a three wire cable gets used as a hot wire. There also times when the white wire gets used as a hot but has to be re identified as a hot with marking tape. When wiring baseboard heaters the cable used is red and black with no white wire in the set.
How can you tell if you have a 4 wire cable installed with a 3 prong outlet?
What you term as a four wire cable is known as a three wire cable in the electrical trade. The ground wire is not counted in the cable set as it is not a current carrying conductor. Turn the power off to the circuit in question. Remove the three prong outlet from the junction box. If you see a red, black, white and bare ground then you have a three wire cable feeding the receptacle. If this is what you see and the purpose of this question is to see if it can be changed to utilize a new four blade recepticle then the answer is yes.
Where can one purchase wire and cable?
AWC Wire, wireandcabletogo, and graingerwire are three large suppliers of various types of wire and cable as well as other various types of industrial materials.
What can a 6 wire firewire cable do that a 4 wire firewire can't do?
The 6 wire FireWire 400 cable includes 2 wires that supply 30VDC power to the device that are left out in the 4 wire cable to permit use of a smaller connector.
What gauge wire do you use on a 6 volt battery?
If you are referring to the main battery cable use 00 guage cable.
Can one use 1 circuit of a 3 wire plus ground 2 circuit cable as a GFI circuit with the other as a lighting circuit?
A GFCI can not be used on a three wire branch circuit. It has to be on a single two wire circuit.
What type of wire is used for TV's or cable modem?
Televisions and cable modems use a coaxial cable. RG59 or RG6.
Do you have to use all 4 screws in a Nema L14 30 Plug or can I use 12 2 wire and leave one pole empty and only use for 110 power?
The L14-30 receptacle is a three pole four wire grounding 125/250 volt device. Normal wiring using all terminals is 240 volt supply to terminals X and Y. These will be the red and black wires from the three wire cable. Your choice of colours to the X and Y terminals. The white wire from the three conductor cable connects to W terminal and the bare ground wire from the cable connects to the G terminal.To answer the question, yes only one half can be used. The cable that connects to it must be a two conductor #12 which is rated for 20 amps.For 120 volt utilization the supply breaker needs to be a single pole 20 amp breaker, then the circuit will conform to the electrical code.Connect the black of the two wire to either the X or Y terminal, white of the two wire cable to the W terminal and the bare ground wire of the two wire cable to the G terminal.
If you have a 3 wire RCA cable with an s-video cable do you have to use the s-video cable?
No, you can use the VIDEO cable instead and just let the S-CABLE hang loose but the S-Connector/Cable will give a better picture so use it if you can.
