Hopefully you have turned the power off so it makes no difference which you disconnect first.
No !
For wiring in the USA the Neutral conductor is required to be white or gray by the National Electrical Code.
In residential wiring the white wire is neutral on the 120 volt circuits. On a 3way circuit the red is the traveler and the white is neutral. On a 240 volt 3 wire connection the white & black are hot. On a 240 volt 4 wire connection the black and red are hot and the white is neutral.
Question is incorrect. in a 240 Volt single phase circuit, how can you have A phase and B phase?
yes <<>> No, the ground wire is never to be used as a neutral. In this case if you need a 120 volt circuit from the 220 volt circuit a three wire cable (3C #14) must be installed.
A volt can not be connected to a circuit.
A 240-volt circuit typically consists of two hot wires and a ground wire, with no neutral wire. The hot wires each carry 120 volts, while the ground wire is used for safety purposes. In a 240-volt circuit, the hot wires complete a loop by connecting to a load or device that requires the higher voltage to operate.
Yes, to the precision you can measure it. If it isn't you need to check the ground to neutral bonding at main panel and check the wiring in the circuit for loose connections.
Assuming you are using the correct meter with true RMS you most likely have a loose neutral somewhere in the circuit. Try to measure from hot to ground. If this measures 120V then you most likely have a loose neutral somewhere.
Using a 240 Volt rated disconnect switch for a 480 Volt circuit breaker supply can lead to severe safety hazards and equipment failure. The disconnect switch may not be able to handle the higher voltage, resulting in insulation breakdown, arcing, or catastrophic failure. This could pose risks such as electrical shock, fire, or damage to connected equipment. Always ensure that electrical components are rated appropriately for the intended voltage to ensure safe operation.
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.
No, you cannot directly connect a 110-volt circuit breaker to a 220-volt circuit. Circuit breakers are designed for specific voltage ratings, and using a 110-volt breaker on a 220-volt circuit can lead to improper operation, potential equipment damage, or safety hazards. If you need to work with a 220-volt circuit, you should use a breaker rated for that voltage. Always follow electrical codes and consult a qualified electrician for such modifications.