Analysis of the Causes of Tripping of Circuit Breakers at Home

There are three reasons for the tripping of the circuit breaker at home. The first is overload, the second is short circuit, and the third is leakage.

The first type, overload is too much high-power appliances at the same time exceed the rated current of the circuit breaker. Second, the short circuit may be a short circuit of an electrical appliance, or it may be a short circuit of the dark wire. If you do not plug in any electrical equipment, try it. If you still jump, you should consider the circuit has a short circuit. Of course, if it is a switch with leakage protection, there may be leakage. . Third, if it is a switch with leakage protection, the line or appliance will trip with a little leakage, usually 30mA.

If it is the first case, then open less electrical appliances, and change the larger circuit breakers, provided that your line is not too thin and should be larger than the rated capacity of the circuit breaker. If it is the second case, there is a short circuit inside an electrical appliance. It is OK to repair the electrical appliance. If the dark wiring is short-circuited, please check with the professional. If it is the third case, if an electrical appliance leaks, then one by one can be plugged in one by one to try it on, and that is the problem of which electrical appliance is jumped. If there is leakage in the dark wiring, non-professionals can't find it. For a switch without leakage protection, it is only one safety protection.

Remark: The switch with leakage protection has one more block than the ordinary switch, which is wider. There is a small button on the switch with leakage protection. You can distinguish which one you belong to by observing it yourself.

If you suspect that the dark wire has a short circuit fault, use the multimeter resistance file to check the resistance of the phase line to the neutral wire and the ground wire. The home is usually connected with electrical appliances, electric lights and other electrical appliances. It is best to completely disconnect all electrical appliances. The resistance should be large and theoretically infinite. If the resistance is a few ohms or less, it should be a short circuit. If it is suspected that there is a leakage fault, the multimeter may not be able to detect it. It is best to use a shaker to shake the phase line to the ground. The national standard shall not be less than 0.5M. In fact, leakage is not unusable, but it can't be installed with circuit breakers with leakage protection. If people get an electric shock, they will not trip protection. It doesn't matter. As long as all the electrical equipment is grounded, once the outer casing is connected, the circuit breaker will trip. (Note that the grounding wire mentioned here refers to the grounding wire of the system. It is not for you to keep the ground wire of the electrical appliance in the ditch or buried on the ground. That is the TT system, only the circuit breaker in the TN system. To be able to protect reliably)