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Is the white wire safe to touch?
Never assume that any electric wire, no matter what color it has, is safe to touch.
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.
What is the wire that gives off light in a light bulb?
In an incandescent light bulb the wire that gives off the light is called the Filament.
What does it mean when there are two black wires in an eletcric box when changing a light?
Some light fixtures do not have a grounding wire. In such cases the two wire going to the light may both be black. You can connect black supply to either black light wire and white supply to the other black wire.
How do you hook up a light and switch from an existing light?
Add a light to switch from a different circuitI think here your concern is that you don't want change the performance of the circuit to which you add the light.so you have to use a relay or a solid state relay to the circuit and a separate power supply to the light in compliance with all the safety rules.
