Because the white wire on a 120 volt circuit is the neutral wire that is connected to the silver screw on outlets and switches. It is connected to the neutral bar in the service panel.
The voltage is lost at the slice.
YES the white wire can shock. There are a few reasons why it might: 1) the white wire is actually connected to a switch. When the installer connects the white wire from the switch to the light, the National Electric Code requires the white wire to be "hot", and to be marked to indicate that it is hot. Sometimes this doesn't happen. The problem comes later when Joe homeowner replaces the light fixture. He sees the white wire with a black mark or maybe not, and connects the white wire to all of the other white wires. When the switch is turned on, the black wire that he placed on the other side of the switch connects to the white wire and trips the breaker. When Mr. Homeowner checks it out, touching the white wire gives him a shock. 2) The white wire returns the current to the source of the circuit. When the white wire is shared with two circuits, It returns the current from both circuits to the panel. When someone (even a professional) turns off only one of the circuit breakers to these circuits, the white wire still carries the current from the second LIVE circuit. If the person is replacing a receptacle withonly one of these circuit breakersoff, he or she could touch the white wire (called an open neutral) and get a shock from the returning current from the second circuit.
White wire is usually used as a neutral conductor and a 240v ac unit has no neutral. Each leg of the 240 volts is a "hot" leg However, very often a 12/2 or 14/2 NM cable is used to power small window ac units using 240v. In this case one of the conductors is white, but is not a neutral. It is good practice to mark the white wire with black tape so it is readily identified as a hot wire.
If you are referring to lamp cord type wire where both wires are brown then yes, connect the wire with the groves to the white neutral and the smooth wire to the black hot wire.
Assuming you are working with 120v, you need #4 AWG copper conductors.
3 OR 4 . you only need 2 wires for 220, 1 phase is 120v between 2 of them its 220v . you also should have a ground for the third wire ,and the newer stuff requires a neutral or white wire for the 4th wire. hope i helped , D
In common house wiring, black is the power wire, white is the neutral, and green is the ground wire.
Don't!
Black
Use AWG #10 wire on a 20 amp breaker.
That could only happen if the neutral wire (white) becomes disconnected at either the panel, the meter base or the transformer.
Wire the switch to the hot/black lead.
The voltage is lost at the slice.
Yes.
4 wire household wiring is black, red, (hot wires) white (neutral) and bare or green (ground wire). You say 3 wires. Is it 120v or 240v. If its 240v which is more common just use the two hots and the ground and cap off the neutral wire.
You would need a 12VDC to 120VAC power supply.
Usually is Black and Red or gray (in old building ). Some time if you see white wire that mark in red or black ( either mark with tape or ink ), it consider live wire. Just to be sure, get the tester and check it everytime you work with electrical wire. Shut off power at the main if you can for extra safety.