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In some cases in residential wiring you do. From a light fixture junction box to a switch box, the cable is a two wire, black and white. To connect the switch into the circuit at the fixture box, the "hot" conductor is connected to the white wire that goes down to the switch. The switched "hot" comes back on the black wire and this is then connected to the fixtures black wire. The white (neutral) is picked up in the fixtures junction box and connected to the fixtures white wire.

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11y ago
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13y ago

In the US, for AC electrical wiring:

any color not white, gray or green (usually black or red) = HOT

White = Neutral (current carrying)

Green = Ground

Different color conventions are used in other countries, and also in wiring for autos and electronics. For example, in most DC circuits in electronics, the black wire is ground or battery negative and the red wire is positive.

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14y ago

The assumption is that you are asking about house wiring. Typically the black is the "Hot" lead, the "White" is neutral and the bare wire is ground. If there is a red wire it might be part of a 240 VAC circuit or it could be part of a 3-way switching or dimmer lighting circuit. You would have to better describe what you are connecting and where to tell you much more.

ponypomp;

You don't, but that is because you don't know enough to be working with it.

Sorry, but getting killed to save a few dollars is not worth it, if your working with 240v

as the post above said. If you have a connector,red that is being used as a three way

and don't hook it up correctly, you could fry the switch or what ever you are doing.

There are several scenarios for say 12/3 w gr. You need to be able to read a wiring diagram.

Safe is better then sorry.

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10y ago

Yes, in some circuit connections the red wire will connect to the black wires. Without more information as to how the circuit operates and what is trying to be done with the circuit, this is the only answer that can be given.

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11y ago

If the switch has a black screw this is a 3way switch. On a 3way circuit on one switch you connect the black power wire to the black screw, and on the other end of the 3way circuit on the other switch you connect the black wire coming from the light to the black screw.

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10y ago

In electrical home wiring that is wired correctly NO.

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11y ago

black to black

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Q: Can you connect black wire to red wire?
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