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Electrical Knowledge: Why do household leakage protection switches trip frequently?
Date：2022-03-04 13:30
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(1) Poor installation. The lead wires of each pile head are not securely connected, and prolonged looseness can cause the pile head to heat up, oxidize, burn the outer insulation of the wires, and emit sparks and a burnt smell, leading to under-voltage in the circuit and tripping of the air switch.
(2) The leakage switch itself has quality issues. It is not compatible with the load. The actual electrical load in the household exceeds the rated current of the low-voltage circuit breaker on the line. This generally occurs after the installation of new or additional high-power household appliances such as air conditioners or electric water heaters. A matching air switch must be replaced.
(3) Electrical appliances or circuits have leakage or short circuits. When a leakage is detected in the used electrical appliance, simply unplug the appliance with the leakage fault and then reset the low-voltage circuit breaker to restore power. If a circuit leakage or short circuit is found, an electrician must be called to handle the issue. After the low-voltage circuit breaker trips, first disconnect all branch circuits, then reconnect them one by one. If power cannot be restored to a certain branch after it is reconnected, it indicates a fault in that branch, which should be disconnected while restoring power to the other branches. After identifying and repairing the fault in the problematic branch, power can be restored.
(4) The incoming voltage of the power supply is too high. This is very dangerous and generally occurs in residential buildings with a "three-phase four-wire power supply system." At this time, check whether both wires in the circuit are live; check whether the neighbors on the left and right have also tripped their breakers; and measure the incoming voltage with a multimeter. Never forcibly reset the low-voltage circuit breaker, as this could damage appliances or, in severe cases, cause a fire.