i have an underwriters laboratories bv-5981 power cord and none of the ends are marked.
2007-03-08 10:23:50 · 5 answers · asked by Jayhawkt 1 in Science & Mathematics ➔ Engineering
i need it for my stove!
2007-03-08 10:26:46 · update #1
If you mean the 2220V power from the wall outlet those are not DC lines so one is not always positive and the other is not always negative. Instead they alternate being positive and negative 60 times per second (50 times in some countries).
If the cord includes a black and white wire then the black one is live (L1) and the white one is at ground potential (L2) for a single phase cord. If the cord includes a black (110 volts to ground), a red (110 volts to ground on other phase) and white (the ground reference) you are dealing with a two phase system which is 220 volts between phases but 110 volts from ewither phase to ground.
2007-03-08 12:51:56 · answer #1 · answered by Rich Z 7 · 1⤊ 0⤋
.You will find that there are three conductors. The green or bare wire is ground or neutral and won't be used unless the appliance contains a 110 volt component.
There isn't a positive or negative on the other two conductors as they will switch from one to the other 60 times a second. But what you need to know is these two conductors are interchangeable. When connecting to a 220 volt appliance, you will have two terminals and these two conductors can connect to either terminal each.
These conductors might be black and white or black and red.
The fact that you ask this question tells me that you probably don't have enough experience with electricity and suggest you consult an electrician.
I hope this helps.
2007-03-08 10:26:08 · answer #2 · answered by H.C.Will 3 · 2⤊ 1⤋
There is no positive or negative because it is AC.
Also,,, on a 220V 3-wire circuit there are 2 "hot" and 1 "neutral" wires. Both main pins are "hot" (one wire is usually coded black and the other one red). If it is a 3-wire connector, the 'middle' pin is the neutral (white). If it is a 4-conductor connector, it better be marked somehow, or I'd get another connector.
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2007-03-08 10:30:51 · answer #3 · answered by tlbs101 7 · 1⤊ 0⤋
There is no posative or negative. The colors of the wires determine the voltage or neutral wires. Each country has it's own color code. In the US white is neutral green is ground (earth) red or black are hot wires.
2007-03-08 10:27:34 · answer #4 · answered by John S 6 · 1⤊ 0⤋
line voltage is positive neutral voltage is negative
2007-03-08 10:27:42 · answer #5 · answered by Anonymous · 1⤊ 2⤋