Every house has circuit breakers for each room of the house. They will sit in a box all together and they help protect electrical circuits from damage. Sometimes damage can happen through a short in wiring or flooding. The circuit breakers allow a large amount of electricity to be sent throughout the house and prevents an overload of voltage by having one Indoor VCB for each room. Circuit breakers need to be tested periodically to make sure they remain in good running condition.
1 Open the electrical box in your home. You should see a long row of black switches corresponding to a different part of your house. (Ideally, they will be labeled as such so you can tell which one goes to which part of the house.) These are the circuit breakers.
2 Turn off or unplug all electronic devices being powered through the questionable circuit breaker. This will prevent a short in case there's any kind of unforeseen surge.
3 Check the pertinent circuit breaker to see if it's in the "off" position. If it is, it's likely doing its job (though you should still complete the test to make sure). Turn the circuit to the "on" position. If it trips back to the off position within a few seconds, then the problem is probably with the wiring itself, and will require the attention of a professional electrician.
4 Set a multimeter to the "Volts AC" position. Touch one prong to the VCB's terminal screw and the other prong to the ground screw. Check the indicator on the multimeter. If the light doesn't go on or it doesn't indicate anything on the readout, then there's no power flowing and the circuit will need to be replaced.
If you need to replace a faulty Circuit Breaker Vacuum, make sure you trip the main circuit breaker after completing the test. That shuts off power to the entire house and will let you safely remove the old VCB without a threat.
Electricity is always dangerous. Before testing the circuit breaker, always dress in rubber-soled shoes to stay grounded. Furthermore, make sure the area around the electrical box is dry, particularly on the floor where you're standing. Never touch the multimeter's bare wire or the screws on the circuit breaker while you are testing the circuit. If electricity is flowing through them, you'll likely receive a painful shock.
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