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 other end is grounded with the neutral wire.
How many wires are there in general generators? Each wire or terminal has required markings. After servicing the generator, the generator wiring must be connected correctly according to the markings.
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 voltage 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.
Is it dangerous if the hot and neutral wires of a small single-phase generator are connected backwards?
Nobel's words are very good and complete.
In the picture above, whatever wire you connect to ground is the neutral wire. The remaining chain is the live wire. Remove only the live wire, pass it very far and connect it to your voltage (current) meter. The other terminal of the meter is grounded, which is the neutral wire. This is essentially how power plants provide electricity. But it's actually much more complicated than that. This is actually three-phase electricity. Three live wires are transmitted. The voltage between any wire and the neutral wire is 220, and the voltage between any two wires is 380. This is the actual process, of course, I haven't taken into account the increase and decrease voltage during transmission.
Also, you mentioned the pen testing issue. According to my explanation above, testing electricity with a test pen is to form acircuit between the wire to be tested, the test pen, the human body and the earth. If this wire is the live wire, there will be current in the middle and the test pen will light up. If this wire is the neutral wire, that is, the ground wire, if you reconnect it, there will be no current. between.
As there is a large resistance in the middle of the test pen, people will not be electrocuted during the electrical test. If the test pen is a light bulb and the resistance is not large, it will electrocute people. . This is why people can be electrocuted if the switch is not connected to the live wire and disconnected.
A light, a zero and two wires are connected to the house without distinguishing the neutral wire and the live wire. The ground wire is used for protection. For example, the electricity generated by the generator must be equipped. with a motor, and the ground wire is It must be connected to the motor housing. BiOf course, there must be a leakage protection switch between the generator and the motor. The fire and zero of the generator must be connected to the input. interface of leakage protection switch and generator ground wireIt cannot be used as a neutral line. All high voltage electricity must be used in accordance with regulations otherwise it will be dangerous if you are connected to a zero to one ground which will not have voltage, make sure you don't do this. connect one to one at home. This can The generator shell is live, dangerous! ! ! !