3 Black Wires And 3 White Wires

3 Black Wires And 3 White Wires. The box is part of a chain of four fixtures operated from a single switch. White - "neutral" return or common.

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White - "neutral" return or common. The Earth is a very important part of the electrical system and all switches. Household circuits usually consist of a black wire, a white wire and a bare copper ground wire.

In my wiring thread (sig) are instructions on how to figure out which wires do what.

You won't have three black and two white wires unless they are pulled in some type of conduit.

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You can see (if you trace through the wires and the switches) that in the previous figure, the light is off. As Kudzu says, there probably are three cables. At the light fixture, completing the wiring is simply a matter of connecting the black and white circuit wires to the matching wire leads on the light fixture.