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Answer for USA, Canada and countries running a 60 Hertz supply service.I want to add an exhaust fan to the existing light switch, it's already on a 20 amp circuit, it's only got 1 light and 2 receptacles on it. However, I popped the cover off the switch today to find that the switch is not wired normally, with the 2 white leads tied together behind the switch, and the black leads going through the switch. Instead I have only 1 black lead, and 1 white lead in the box. The white then leads back to the black lead on the existing light.

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With just the two wires in the switch box, it means that the junction you will have to tie into is in the light fixture junction box. The usual wiring in this type of connection is, the circuit "hot" is connected to the white wire that goes down to the switch box and connects to the top of the switch. Code states that this wire should be identified as a "hot" conductor by having a black tape identifier on it. The voltage returns back to the fixture on the black wire from the bottom terminal on the switch. To tie a fan into this circuit it has to be paralleled to the light fixture at the light fixture junction box. Connect the fan feeder's white wire to the neutral (white wire) in the light fixture junction box. Connect the fan feeder's black wire to the black wire that returns from the switch and parallel it to the wire that is now connected to the light fixture. This will give you a connection that will turn on the light fixture and the new fan, from the same switch.

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 REALLY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS.

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What are the four features required to construct a working simple circuit?

To construct a working simple circuit, you will need a power source (such as a battery), a load (such as a light bulb or a motor), conductive pathways (wires) for the electricity to flow, and a switch to control the flow of electricity.


How do you light a light bulb with a six volt battery?

You'll need two pieces of wire... and im pretty sure that if you take one end of the wire and put it on the very bottom of the light bulb and the other end of the wire and put it on the positive side of the battery, and take the other wire and put it on the threads of the light bulb and the other end of the wire and put that end on the negative side of the battery, you should get light. (I may have the polarities [positive &amp; negative] mixed up).


How do you switch poles in electromagnetic field?

You get a battery, switch, nail and copper wire. You connect one end of the battery to the switch and the other end to the nail that is wrapped with some copper wire. The end of the switch that isn't connected you connect to the electromagnet.


I have Two black wires and one red wire conected to a switch. Which is hot and which is neutral?

It sounds like your switch is a three way switch. The wire that is on the different colour screw of the three screws will either be the "hot" wire or the wire to the load. The neutral might or might not be in the box that the switch is in depending on which end of the three way system you are at. See discuss question button below.No wires connected to a switch are neutral. A switch breaks the circuit of the hot wire. Black AND red are hot wires. White is used for neutral and is almost never connected to a switch.


How do you pull 1 of 6 lights off a 3-way switch and add a single switch for that 1 fixture?

One 1,000 watt light will push a typical circuit breaker close to its limit. Six such lights will require wiring and circuit breakers to handle the load. Figure one circuit breaker per light. That means not only six switches but six switches, each on a different circuit breaker. Don't overload the wiring or it could cause a fire.

Related Questions

What are all the parts on a circuit board?

to assemble a circuit you just need to connect one end of a wire to the battery and the other to the light bulb ( could be another electrical device) now take an other wire and connect on end of it to the other side of the battery and the other to the other side of the light bulb( or an other electrical device. if your circuit is including a switch this is how you do it: ( you will need three wires for this circuit if you have one electrical device) connect one end of the wire to the battery and the other to the switch.Grab another wire and attach one end of it on the other side of the switch and the other to the electrical device (light bulb). Grab another wire and attach one end of it to the other side of battery and the other to the other side of your electrical device. And there you have it how to assemble a circuit


What are the four features required to construct a working simple circuit?

To construct a working simple circuit, you will need a power source (such as a battery), a load (such as a light bulb or a motor), conductive pathways (wires) for the electricity to flow, and a switch to control the flow of electricity.


How do you light a light bulb with a six volt battery?

You'll need two pieces of wire... and im pretty sure that if you take one end of the wire and put it on the very bottom of the light bulb and the other end of the wire and put it on the positive side of the battery, and take the other wire and put it on the threads of the light bulb and the other end of the wire and put that end on the negative side of the battery, you should get light. (I may have the polarities [positive &amp; negative] mixed up).


If you tie piece of copper wire a end of a exhaust.. what will happen?

If a person ties a piece of copper wire at the end of the exhaust pipe on a vehicle the copper is going to heat up. When the copper heats up it will turn a rainbow of colors.


What is a trembler switch?

A trembler switch operates by vibrations. Vibrations cause the switch mechanism to complete or interrupt an electrical circuit. It can be used to trigger and alarm, turn on lights or many other devices. A simple trembler uses a metal can (soup can) with a small hole in the top and a weight suspended from a bare wire through the hole with a weight attached to the end of the wire (the hole must be large enough so the wire does not make contact with the can). The other end of the wire is connected to a battery (or other power source). The other pole of the battery is connected to the can. When vibrations cause the weight to move enough to cause the bare wire going through the hole in the top of the can to contact the can the circuit is completed.


How do you wire a light to a switch at the end of a run and which controls an outlet?

Bring power into the light switch box 12/2 or 14/2 wire depending on the existing wire. Make sure you use the exactly same size wire that is used on that circuit. If you do not know look at the breaker in the main panel that controls power to that circuit. 20 amp will be 12/2 wire and 15 amp will be 14/2 wire. Now run another wire from the switch box out to the outlet. Inside the switch box, strip both white wires back 3/4" and connect them together under a wire nut and push this back into the box. Connect the 2 ground wires together and then connect that to the ground screw on the switch. You now have 2 black wires left. Connect them to the 2 screws on the light switch. Does not matter which black wire you connect to which screw. At the outlet connect the ground wire to the green ground screw, black wire to copper screw, and white wire to silver screw. That outlet will now be controlled by the light switch.


How do you switch poles in electromagnetic field?

You get a battery, switch, nail and copper wire. You connect one end of the battery to the switch and the other end to the nail that is wrapped with some copper wire. The end of the switch that isn't connected you connect to the electromagnet.


How do you wire multiple lights starting at the lights first switch last and a power drop behind?

Imagine a section of railroad track where the rails are the power source and the ties between rails are the lights. The rails will supply power and let's label them the black rail (hot) and the other rail white (neutral). The earth they are resting on is the ground (bare copper wire). So each light must be connected to black, white and ground. To switch all lights at once we need to open the connection just to the hot side. Wiring in parallel like this example you run a wire between each light and connect the incoming black wire to the light black wire and the outgoing black wire using a wire nut. You do the same for white and bare wires. When you are done you have a circuit that looks like the railroad track. You could connect a supply at either end and the lights would light. You could then just insert a switch in the black side and control all lights. In a situation where the supply is closer to one end of the circuit is closer to the other end physically you do the following. Run a wire from the switch to end where supply is located. On this wire wrap about 3 inches of black electric tape on the stripped white pigtail on each end. This designate the white wire is hot. Now connect black wire to one side of switch and taped white wire to other side. Connect bare wire to green ground terminal on switch. At the supply end connect the black wire from supply yo black switch wire and black light wire to taped white wire. Connect grounds together. Connect white supply wire to white light wire.


How do you wire an AC electromagnet?

To wire an AC electromagnet, you would typically connect one end of the coil to the live terminal of the AC power source and the other end to the neutral terminal. It's important to use appropriate wire size and insulation to handle the current and voltage of the AC supply. Additionally, you may need to use a relay or switch to control the circuit.


I have Two black wires and one red wire conected to a switch. Which is hot and which is neutral?

It sounds like your switch is a three way switch. The wire that is on the different colour screw of the three screws will either be the "hot" wire or the wire to the load. The neutral might or might not be in the box that the switch is in depending on which end of the three way system you are at. See discuss question button below.No wires connected to a switch are neutral. A switch breaks the circuit of the hot wire. Black AND red are hot wires. White is used for neutral and is almost never connected to a switch.


Can a current flow in a wire with a free end?

No, a current cannot flow in a wire with a free end because there is no complete circuit for the current to flow through. In order for current to flow, there must be a closed loop circuit for the electricity to circulate through.


How do you change oxygen sensor in 1986 Nissan 720 truck?

its screwed into the exhaust manifold,loosen the end of that connectionand unscrew it from the exhaust manifoldand screw the new one in and connect the wire to the other end.