According to the presence or absence of sparks, size and other phenomena to check the electrical dur failure. For example, when a spark is found between a normally tightened wire and a screw, it indicates that the wire end is loose or has poor contact. The electrical contacts flash when the circuit is closed or break, indicating that the circuit is on, and if there is no flash, it means that the circuit is not working. Action procedure: The action procedure of the electrical appliance should meet the requirements of the electrical manual and drawings. If the electric appliance on a certain circuit acts too early, too late or does not act, it means that the circuit or electric appliance is faulty.
In addition, you can also analyze and judge the fault based on the sound, temperature, pressure, smell, etc. emitted by the electrical appliance. Using the intuitive method, not only can simple faults be identified, but also more complex faults can be reduced to a smaller range.