Start by turning off all the lights, appliances, and electronic devices in your home. Then, reset the main circuit breaker by switching it off and on. Afterward, turn on each circuit one at a time, and observe which one trips the breaker. Once you've identified the circuit, you can focus on narrowing down the problem.
Carry out a trip test to find out: Switch off and unplug all appliances from every socket including removing light bulbs in affected areas. Put the trip switch back on. Plug in appliances/light bulbs one by one – check the trip switch after every appliance you plug in to make sure it hasn't tripped again.
I plug a circuit tracer into a plug and then take the circuit locator to the panel and go over each breaker until I find the one the tracer is plugged into. If you turn all the lights on you may locate most of them as you turn off the breakers.
If your helper can't readily identify a location that's connected to a breaker, mark the area next to the breaker with a small dot. Come back to it after you have finished identifying the rest of the circuit breakers. You can then look at the plans and figure out what location goes with the breaker in question.
Your circuit breaker should appear as a metal box; you may only see the door if the box is recessed into your wall. The box and door may be a matte gray color, or they may be painted over to match the color of the surrounding area. If you can't find your circuit breaker, call on your electrician for assistance!
Start with all the breakers off and plug a lamp — turned on — into an outlet. Flip breakers on and off one at a time until the lamp lights up. Next, plug the lamp into the other nearby outlets to determine which ones are on the same circuit. Flip nearby light switches on and off to see which circuit the lights are on.
The best and most straightforward way to identify a circuit breaker type is to look at the breaker box label. Each manufacturer adds a label to the inside of the panel that determines the kind of breaker box you have. The label will include safety warnings, the model type, and suggested breaker types.
While leaving a breaker tripped for a short period is generally harmless, it's not ideal to leave it tripped for an extended period.
Running too many appliances at once, such as your toaster, coffee maker, and electric kettle could overload the circuit. For a simple solution, use your appliances at different times to avoid tripping the breaker. In older homes, sometimes your bathroom outlets are on the same circuit as some in your kitchen.
Open the cover on the consumer unit to see which switches have tripped to the OFF position. Put them back to the ON position. If tripping occurs again, it is probably being caused by a faulty appliance. You need to identify which circuit is affected and which appliance on that circuit is causing the problem.
Burnt Out or Faulty Outlet
Over time, outlets can simply wear out. If you find your electrical outlet not working but the breaker isn't tripped, the outlet itself could be faulty. You might notice burn marks or the outlet may feel unusually warm to the touch. These are strong signs that the outlet has failed.
Electricians use a wire tracer to locate wires and identify circuits and breakers without having to put unnecessary holes in walls or waste time guessing to find the correct wire in a bundle or run. A wire tracer has two parts: a transmitter, which generates a signal and sends it along the wire.
Using a Non-Contact Voltage Tester
If you suspect that there are live electrical wires hidden behind the walls, a non-contact voltage tester can help you identify their presence. Before starting any work, use the voltage tester to scan the wall surface and check for voltage signals.
Look at your panel for a breaker that is now in the “off” position or between “on” and “off.” Some breakers even have a light that will show up if your breaker has been tripped. If it's placed in between, move the breaker to the “off” position before returning it to the “on” position.
Manufacturers often rate MCBs for a certain number of breaking operations, usually between 100 to 1,000 trips under fault conditions. Each trip weakens the internal components, especially the contact points, which deteriorate over time.
Circuit breakers can trip with nothing plugged in due to overloaded circuits, short circuits, ground faults, faulty breakers, loose connections, or wiring issues. This common issue can be puzzling and concerning, as it may indicate underlying electrical problems that need immediate attention.
A circuit breaker finder is a small battery-operated electronic tool with two parts—a transmitter and receiver. It is designed for single purpose—to identify which circuit breaker in a main service panel serves a particular outlet or light fixture to which the tool's transmitter is connected.
There's also the circuit breaker finder kit specifically for electrical wiring but as far as I can tell that's just for identifying circuits in your breaker, not tracing the wires.