To check electrical faults based on the presence and size of sparks. For example, if sparks are found between normally tightened wires and screws, it means that the wire ends are loose or the contact is poor. When the contacts of electrical appliances close or break a circuit, sparking indicates that the circuit is connected; failure to flash indicates that the circuit is disconnected. Action procedures: The action procedures of electrical appliances should comply with the requirements of electrical instructions and drawings. If an electrical appliance on a certain circuit operates too early, too late or does not operate, it means that the circuit or electrical appliance is faulty.
In addition, faults can also be determined based on the analysis of sound, temperature, pressure, smell, etc. emitted by electrical appliances. Using the intuitive method, not only can simple faults be determined, but more complex faults can also be reduced to a smaller scope.