In a DC application, black is always Negative, so the white wire would be +12v and black would be Negative.
It means that the wires has different colors on it. I have an awkward family
I am guessing that your 3 wires are black (hot), white (neutral) and bare or green wire (ground). Connect black to black, white to white and ground wire to the metal case of swag kit.
Should be 220 to 240 V between Red and Black and 1110 to 120 V between Red and White and between Black and White.
More information is needed as to what device you are connecting to what power supply. The only two identifiable wires are the white and green. In North America the white colour is used for the circuit's neutral and the green is used for grounding of devices.
You would have to provide more info to be certain what your problem is. Typically a black and white wire would connect to the two wires on the light fixture. The fixture should also be controlled by a switch that "breaks" the black (Hot Wire) to turn off the fixture. If you have a volt meter you can see if there is 120Volts between the black and white wires with switch on. If there is a single white wire going to fixture (Neutral), where is the "black wires tied" to. Maybe one of the black wires has broken off the fixture.
It means that the wires has different colors on it. I have an awkward family
I am guessing that your 3 wires are black (hot), white (neutral) and bare or green wire (ground). Connect black to black, white to white and ground wire to the metal case of swag kit.
Should be 220 to 240 V between Red and Black and 1110 to 120 V between Red and White and between Black and White.
White to neutral, black to line, gray to fan and purple to fan.
If both wires are black then the one with the writing is the neutral wire. If the two wires are black and white then the white one is the neutral.
More information is needed as to what device you are connecting to what power supply. The only two identifiable wires are the white and green. In North America the white colour is used for the circuit's neutral and the green is used for grounding of devices.
Black, white, and copper.
It is because the nec standard.
reversed polarity in an electric circuit, means whoever was doing the wiring had no knowledge of wiring. reversed polarity means that wires ( mostly on outlets) are incorrect. the black wire goes on the gold screw, the white goes on the silver one & the bare wire goes on the green screw. most home centers have a library of how to books. they average around $20.00 each.
You would have to provide more info to be certain what your problem is. Typically a black and white wire would connect to the two wires on the light fixture. The fixture should also be controlled by a switch that "breaks" the black (Hot Wire) to turn off the fixture. If you have a volt meter you can see if there is 120Volts between the black and white wires with switch on. If there is a single white wire going to fixture (Neutral), where is the "black wires tied" to. Maybe one of the black wires has broken off the fixture.
hot wires are black, white wires are ground
Your black wires are your hot wires. The white is your neutral or common. It would be best to run an equipment ground (green wire) too.