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.
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.
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.
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.
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.
In electrical home wiring that is wired correctly NO.
black to black
Connect the black wire to the incoming hot wire and the red wire to the out going load.
Red is negavite some black
The new cooktop has a 4 wire connection. Red & Black are hot. White is neutral, and green is ground. You existing panel is wired with 3 wires. Black & Red are hot and green is ground. There is no neutral wire. Connect the black to black, red to red, and then connect the white and ground together at the plug.
Normally red or black is the hot wire and green is the ground. However someone may have used the green wire as the neutral wire which is normally white. Just connect the black wire from the light to the red wire and the white wire from the light to the green wire and see if it works. If not you have to pull the wires out of the ceiling box and see how they wired it.
You connect it with the same hot wire as the black wire in the fan. It is intended to be tied to a different switch. One for the fan, and one for the light kit.
Connect the black wire to the incoming hot wire and the red wire to the out going load.
In the heater you will have two wires. You should then have 2 supply wires from the panel, and 2 wires from the thermostat. The neutral (white) supply wire should go to one of the wires on the heater. The hot (black) supply wire should connect to one wire from the thermostat. The other wire from the thermostat will connect to the other wire from the heater.
Red is negavite some black
The new cooktop has a 4 wire connection. Red & Black are hot. White is neutral, and green is ground. You existing panel is wired with 3 wires. Black & Red are hot and green is ground. There is no neutral wire. Connect the black to black, red to red, and then connect the white and ground together at the plug.
Normally red or black is the hot wire and green is the ground. However someone may have used the green wire as the neutral wire which is normally white. Just connect the black wire from the light to the red wire and the white wire from the light to the green wire and see if it works. If not you have to pull the wires out of the ceiling box and see how they wired it.
The 1964 VW Beetle ignition switch only has three wires. Connect the red wire to the positive post. Connect the black wire to the negative posts. Connect the white wire to the auxiliary post.
Assuming the wires are the correct gauge for application and breaker you use black and white wires as hot. Put red electrical tape on each end of white wire and connect red and black to the breaker output and bare wire to ground lug in panel. At receptacle connect black and red to hot contacts and bare wire to ground lug.
You connect it with the same hot wire as the black wire in the fan. It is intended to be tied to a different switch. One for the fan, and one for the light kit.
House wire is "line" Black & White house goes to Black & White of Timer; the "load" (e.g. Pond Pump, etc.) is connected to the Red & White. Specifically, put all 3 whites together (nut or terminal); House (source)(line) Black to Timer Black; and "load" Black to Timer Red. The Red wire is the "Timed" (switched) hot wire.
Red wire=positive Black wire=negative
To answer this question fully the type of appliance has to be stated and its voltage.
I connect the red wire to the blue wire to deactivate a bomb.