Electrical cables are all black & I need to find which is live &
ac, aka, alternating current, is the type found in your house. dc, aka, direct current, is the type found found in your car...or any other type of battery. If you have a total of three wires, one green, (ground) and the other two are black, then the two black wires are your alternating current wires. If this is the case, hook up your black wire from the fan and light to one of the black wires, and the whites, or commons, to the other black wire. In alternating current it does not matter which wire goes to where.
If there are 3 black wires, and a ground wire, then you will have to use your volt meter, and check the voltage from the wires, you should take three readings (wire a-b, wire b-c, and wire a-c) two readings will give you 120 volts and the third will give you 240 volts (approx) The two wires that give you 240 are your hot leads, and are probably controlled seperatly by wall switches. Hope this helps.
Jun 22, 2009 |