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How do you wire a 20A switch which comes with a neutral wire when only 2 wires are available for the circuit?
You never switch a neutral wire, only hots. hooking both hot and neutral to the same switch will result in a short when the swith is turned on.
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There is a way to wire a light fixture controlled with two 3-way switches using only 14-2 cable. Run a length of 14-2 cable from each 3-way switch to the light fixture and a t…hird one between the switches to act as travelers. This is not an optimum method for wiring this arrangement, but it is possible in a pinch, if no 14-3 cable is available. This method leaves an unused conductor in each of the cables linking the light fixture to a switch, each of which must be tied to ground at both ends to indicate they are not carrying current. The conductors that are used must conform to the color convention for hot and neutral conductors, and any white conductors that are hot must be wrapped in red or black tape. It's important to remember that the travelers and switches must always be situated between the hot electrode of the power source and the load (light fixture), to prevent any of the wires in the light fixture from being live when the switches are off (no current flowing in the circuit). Also, if metal boxes are used, the two cables must run through the same hole in any box they enter to avoid problems with eddy currents. A variation of 3-way switch wiring employing 14-2 cable is one in which two widely separated light fixtures are controlled, such as at the top and bottom of a staircase. In this variation, the light fixtures must be connected in parallel, necessitating that an additional conductor be run between the fixtures. As a result, some parts of the circuit will contain four conductors, which can be provided using two lengths of 14-2 cable, while other parts will need only three conductors, depending on the relative locations of the light fixtures and switches
Can you use 15A outlets on a 20A circuit with 12-2 wire and a 20A breaker and how many outlets would this allow?
I'm going to assume you are referring to residential construction because rules for commercial and industrial settings can be different. Also rules differ by geography (i.e. C…anada specifies a maximum of 8 outlets on a 15 amp circuit, USA code is silent on the issue but for practical purposes, more than about 10 will likely lead to poor performance. Some code also specifies max loading of a 20 amp circuit at 80% making 10 outlets the practical limit if using 20 amp outlets on that circuit. To expand on the previous answer a little, there is a large margin of safety in the construction of these components but if you think about it, you are placing a component that is rated at 15 amps into a 20 amp circuit. That outlet is potentially the weakest link in the circuit and could act like a fuse. If any of those 15 amp outlets are overloaded, it might overheat and fail before the circuit breaker. This is a recipe for a fire. You may think now that you'll remember to only plug in light loads, but these things have a habit of growing. You can plug typical small home appliances (lamp, stereo, TV, etc.) into a 20 amp outlet so the only benefit in using the 15 amp outlet is the minor cost savings at installation. If it were my building, I wouldn't risk it. If I can't talk you out of doing this and it's allowed by your applicable code, make sure you don't daisy-chain the circuit through the outlets. (In other words, don't run your 12-2 wire in one side of the outlet and out the other side.) Instead, use a pigtail (short piece of wire) to tap off your line to each individual outlet. In the United States you can run 20 amp breakers with 15 amp outlets but not in Canada. And for how many? About 10 to be on safe side as long as they are all low amp usage appliances. TVs, steros, fans, lamps. You can run 20 amp breaker with 12-2 wire as long as you make sure you use the 12-2 wire that is rated at 20 amp. Whilst this was not your exact question it is worth saying IT IS NEVER SAFE to run a 20 amp load through a 15 amp receptacle. It is only rated to handle up to 15 amps. 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.
How do you install a 240V 20A breaker and receptacle with 1 hot 1 neutral and 1 ground when there are 2 hot wires and 1 neutral?
for USA, Canada and countries running a 60 Hz power supply service. The receptacle you are trying to use is the wrong one in this application. There are 2 different… types of receptacles for 240 volts: "2 hot,1 ground" and "2 hot, 1 neutral, 1 ground". Please get a professional to help you with this. 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.
Answer for USA, Canada and countries running a 60 Hz power supply service. (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?) Can a 12-2 wire be connected to a 20-amp 240-volt circuit breaker to power a 240-volt heater? There are limitations. If there is a 120-volt fan in the heater, it will be necessary to run a 12-3 wire, so that there is a conductor for the 120 load neutral. With a strictly 240 operation, the maximum wattage that can be served by a 20-amp circuit is 3840 watts. It is allowed to continuously operate a circuit at 80% of it's rated ampacity [4800 watts]. Continuous operation is defined as 4 hours or more continual operation. 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.
If it has a metal body you attach a suitable cable to match the ground or earth wire colour in your country ( such as a 6 mm squared cross sectional area ) copper cable with g…reen-yellow ( in the U.K.) insulation colours to the metallic frame of the dishwasher with a cable lug and a brass ( preferably ) nut & bolt. Then using a suitable length of cable to the nearest grounded piece of metalwork such as a copper pipe using a "earth clip" for a copper pipe. These can be bought from electrical wholesalers who supply all electricians or / and electrical contractors.
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 a…ny 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.
How do you wire an outlet with 2 hot and 2 neutral screws with a wire that has only 1 hot and 1 neutral wire along with a ground wire?
The very first thing you do is shut the power off to that circuit if you are going to work on it. A regular duplex receptacle has 5 screws on it. With the receptacle facing yo…u and the U ground pin facing down, the left side (neutral blade, silver screws) connects to the white (neutral) incoming wire. The right side (hot blade, gold screws) connects to the black (hot) incoming wire. The ground wire connects to the green screw on the receptacle Strip and wrap the wires around the appropriate screws. This leaves you two more screws on either side, tighten them snug as no wires go under them. Reinstall the receptacle back into the wall and turn the power back on.
The neutral wire is a return wire for the current in an electrical circuit. Do not confuse for the ground wire which is also a return wire but is used in the event the connect…ed appliance shorts to protect the user from electrical shock. The neutral is actually very similar to the ground, though. In a residence the neutral comes from the power plant, whereas the ground comes from a ground rod below the meter. In most older homes the ground and neutral were connected to the same bar in the breaker box. In newer homes they now have separate bars. Here is something interesting about the neutral wire. If you are testing a live circuit using a static checker, the neutral will not show a charge, only the hot wire will. However, if you had a circuit controlling some device (maybe a light fixture) and the light fixture was in the on position, but the neutral was cut you would notice the two wires slightly sparking when you touch them together. If you were to complete this circuit with your body you will get shocked or electrocuted. If the device were in the off position you would be safe, but don't take any chances when working with electricity. Turn off the power first.
The power company uses a single transformer outside your home to reduce the voltage from the transmission line voltage down to the 240/120 volts that you can use when you plug… in your appliances. The power company is trying to be responsible with their money when they put that transformer out there, so they use a transformer that can provide both 240 Volts and 120 Volts, at the same time. To do that, the output of the transformer is divided into two halves; one half provides 120 Volts, and the other half provides 120 Volts, with a "common" or "center tap" in the center of the 240 Volt transformer winding. It isn't a coincidence that your 240 volt plug that operates the electric range or electric dryer is twice the voltage of the 120 volt plug that operates your TV. By using half of the output from the transformer to provide your 120 Volt service, you are technically using the center tap/Common wire as one of the current carriers for the circuit. In theory, the common wire should be identical to the ground wire, but because real life isn't quite the same as the theoretic, it is necessary to treat them differently. In some VERY OLD neighborhoods there were no 240 volt transformers, and as such, no neutral/common wire.
If your wiring it up for a light switch, then you will need 2 3 way switches, this will allow you to turn on and off lights from 2 locations
The neutral is needed for the internal sensing electronics inside of the photo cell switch.
Can you use 15A outlets on a 20A circuit with 12 2 wire and a 20A breaker and how many outlets would this allow?
It depends on if you have a single outlet (receptacle) on a branch or multiple receptacles on a branch. One receptacle on a 20A branch: The receptacle must be rated 20A Tw…o or more receptacles on a 20A branch: The receptacles can be 15A or 20A Technical Reference: 2011 NEC 210.21(B)(1)A single receptacle installed on an individual branch circuit shall have an ampere rating not less that that of the branch circuit. 210.21(B)(3) Where connected to a branch circuit supplying two or more receptacles or outlets, receptacle ratings shall conform to the values listed in Table 210.21(B)(3), or, where rated higher than 50 amperes, the receptacle rating shall not be less than the branch circuit rating. Table 210.21(B)(3) 20A Circuit Rating 15A or 20A Receptacle Rating
Exactly the same current as in the line conductor.
Each of two 3-way switches has two fixed poles and a center pole switched to one or the other of the fixed poles. Tape each end of the 14-2 white wire with red tape. Now run t…he 14-2 wire between the two switched and connect the black to one fixed pole and the red between the other fixed poles. Now one switch is at the supply of power and the black wire is connected to the center pole and common is run to light. The other switch runs a black wire to its center pole and the other end to the light. All grounds are connected together. If you use 14-3 all switch to switch wiring and common are taken care of and you don't need an extra 14-2 common to light from supply.
If the power feed goes directly to a fixture, or if you are wishing to switch a receptacle that is not now switched, you can us a 14-2 NM cable to install a "switch loop", pro…vided the circuit is no larger than 15 amps. To do this, after running the 14-2 NM cable, connect the WHITE conductor of the 14-2 to the hot wire. At the switch, connect the black and white conductors to the switch terminals. At the fixture or receptacle, the black wire of the 14-2 NM cable now becomes your switch leg and is connected to the black conductor of the fixture or brass terminal of the receptacle. The NEC (for the United States) requires that the switch be fed with the white wire and the black wire be used as your switch leg.
It depends on the circuit used, but usually, yes.