That is called 4 way intermediate switch wiring. Click the link to watch a video I have posted showing how to wire just such a circuit.
Yes. They are well insulated and have thermal cutoff switches.
When there's two switches connected to the same lamp it's usually because the lamp was meant to be able to be turned on and off from two different places. Useful in corridors and stairs and places like that. Or it can be that it originally was a fixture with more than one bulb in it. Two switches meant you could get different amounts of light out of the same fixture.
On these types of installations an electrician would use a three wire cable set from the switch box to the fixture's junction box. At the fixture's junction box both the fan neutral and the light neutral would be wire nutted together with the incoming neutral from the switch boxes. From the three wire, the white wire would go to the fan and light's neutral wires. The Black would come from the bottom of one of the switches and go to the fan's motor lead. The red wire would come from the bottom of the other switch and go to the light fixture's lead. It can be done with two runs of two wire to the fixture. You will need a two gang switch box for this project to hold the two separate switches. You could use a single gang light switch box if you can still find where duplex switches being sold. A duplex switch is one that has the configuration of a duplex receptacle with the switches being one on top of the other. The cover plate is the same one used for duplex receptacles. To answer this question fully more information is needed. See discuss in the left margin.
The use of a four way switch is needed when a load (such as a light) needs to be controlled from 3 locations or more. For instance when you walk down a hallway and there is a light there are probably at least two switches one at the beginning of the hallway and one at the end. These two switches will turn the light on or off from either location. These two switches will be three way switches. When the need to control a light or a load from more that two locations arises a four way switch is introduced. A light or load can be controlled an unlimited amount of locations by adding four way switches which are wired in between the two three way switches. Think of a sandwich where the three way switches are the bread and the meat and veggies are the four way switches. You can put as much meat and veggies as you want, but you always need two slices of bread on the top and bottom.
A fixture or device that holds a light in place by means of some sort of socket, that is connected to a power source.
This requires 3-way switches that have three separate terminals (plus ground). The method of wiring depends on where the light fixture is in relation to the switches and the feed wires. Most brands of switches contain wiring diagrams to help the installation.
A three wire fixture most likely is one that has two separate loads within it. An example is a ceiling fan with a light fixture. If the three wire is used to separately switch the two loads you have to make a decision as to which load you want to work with the two wire fixture. Once that decision has been made connect the two wire fixture in parallel with the your selected load on the three wire fixture. On these types of installations the three wire fixture is usually controlled by two separate switches in a two gang box. The red and black wires of the three wire terminates on the bottom of either switch. The white wire is connected to the incoming neutral. The top of the switches are paralleled together with the "hot" feeder from the distribution source.
There is no maximum or minimum amount in the U.S. for switched controlled outlets. You can have none if you want. However you must have one outlet installed evert 12 feet minimum or you can install more. If a wall is 2 feet or wider it must have an outlet installed.
Yes. They are well insulated and have thermal cutoff switches.
yes like a hall light.
The switch you are referring to is called a three way switch operating one or a string of devices from two separate locations. You have to either parallel it at the existing light or find out which end the switch leg and associated neutral is on. Sometimes the electrician will feed the fixture with the neutral and use travellers between switches with 3 wire circuits so you first need to know how it has been wired. It is legal to feed the switches and lamps from any of the locations. Unless you are tapping into the light fixture itself, I would have a professional look at it.
The single light will not come on. The traveler legs from the two switches will have to be opened simultaneously if they are not then you will get a flick of light.
Did you check the lamp?
because the lights are not controlled by the ignition switch; they are controlled by a separate light switch.
I have but if dimmer is on low the light fixture sometimes "hums", can be anoying It also shortens the bulb life, significantly in some cases. But their are also CFL bulbs built to be used with a dimmer switch that avoid these problems.Another AnswerYou should only use CFLs specifically-designed to be used with dimmers in circuits controlled by dimmer switches. There is a proven danger of fire hazard when ordinary CFLs are controlled by dimmer switches and, so, this should NEVER be done.
If you are talking about intermediate switches, the switches that are in the middle of the three way (UK two way) circuit, then you can add as many as your project needs. These type of switches must be in the middle, as if installed on the end, the different position switching will not operate.
A fixture is what the light bulb goes into.