There is a potential difference between the two ends of the generator (i.e. the live wire and the neutral wire). The neutral wire is grounded, which corresponds to a potential of 0, and the live wire becomes 220 V. As for why this is the case, it's because there must be a wire connected To the earth. If it is not grounded it will be very dangerous (both wires have voltage relative to ground).
How to connect the live and neutral wires of the generator
Hello:
——★1.We know that the neutral wire is connected to ground (the neutral point of the power system transformer is grounded), the live wire has a voltage of 220 V to ground.
——★2.The home generator produces two wires A and B, and the rated voltage between the two wires is 220 V. Since the output wire ( A or B) of a domestic generator is not connected to ground, there isno distinction between live and neutral wires.
——★3. If you connect one wire (A or B) coming out of the generator to ground, then that wire is called the neutral wire, and the other wire is called the neutral wire. One wire is the live wire, which has a voltage of 220 V to ground.
——★4. For the neutral point grounding device of the transformer, the electrical safety rules are strictly stipulated: the grounding resistance is not greater than 4Ω, and the general household installation meets the requirements. It is very difficult and completely unnecessary to ground the grounding post, which is why home generators do not have a neutral line.
There are four wires coming out of the generator, which should be three live wires and one neutral wire. One end of the three live wires is the live wire, and the live wire. the other end is the wireground and neutral wire.
Generally, several wires or terminals of a generator have prescribed markings. After servicing the generator, the generator wiring should be connected correctly according to the brands.
When generator lead wires or terminals are not marked, or the markings are unclear, or the meaning of the markings is forgotten, the following methods can be used to identify the generator wires. earth.
1. Fire test method. When the generator is working normally, use a wire to scratch. If sparking occurs when a certain wire is scratched against the other two wires, then the wire is the ground wire and the other wires are for line of sight.
2. Voltmeter measurement method. When the generator is operating normally, connect the test lead on one end of the voltmeter to one of the lead wires and connect the other lead to the other lead wires. The tension between the ground wire and the live wire is less than the voltage. between two live wires. For example, if the voltage between a certain wire and other wires is around 6 volts, the wire is a ground wire. If you don't have a voltmeter, you can also use a 12 volt bulb (the voltage is too low and the bulb is easy to burn out), connect it to the two lead wires and determine the voltage. depending on the brightness of the light. When the ground wire and the live wire are connected, the light is darker, and when the two live wires are connected, the light is brighter.