How to Use a Multimeter to Test a Circuit Breaker Safely

What is a Circuit Breaker?

Circuit breakers are safety devices integrated into electrical systems to interrupt current during short circuits and overloads. This helps to protect your property from electrical hazards like fires, appliance damage, and other anomalies in current flow. When a circuit breaker trips, you can easily restore power by turning the switch back on at the main panel. However, recurring breaker trips indicate a more severe underlying problem that requires professional intervention.

Steps to Test a Circuit Breaker with a Multimeter

Before undertaking electrical projects, it is crucial to ensure that you have the right tools for the job. With that said, make sure you have a multimeter, screwdriver, insulated gloves, and safety goggles. If you don’t have all the tools, hire certified electricians to help. Professionals have access to industry-grade equipment and are updated on safety regulations, ensuring compliance with local codes. Once you have the tools needed, follow these steps to ensure a seamless inspection.

Ensure Safety

As mentioned, safety is vital when undertaking electrical projects, and multimeter tests are no exception. Turn off all the lights and appliances connected to the circuit you want to test. Wear safety goggles and insulated gloves to protect yourself from any electrical hazards. The last thing you want is an electrocution or severe injury due to neglecting improper safety measures.

Access the Circuit Breaker Panel

The next step is to access the circuit breaker panel using a screwdriver to remove the screws securing the cover of your breaker box or panel. Set the cover aside and ensure that you don’t touch any metal or wires inside the panel.

Set the Multimeter

Before testing the breaker, set your multimeter to the appropriate voltage setting. Electrical service experts recommend a 120-volt AC (alternating current) for residential circuit breakers. Commercial buildings may require a slightly higher setting, so consult a professional electrician to avoid inaccurate readings and other hazards.

Test the Circuit Breaker

When testing a circuit breaker, place one prong of your multimeter on the terminal screw and the other on the neutral bar in the panel. A functional breaker should read close to 120 volts for residential buildings. If the reading is significantly lower than 120 volts or zero, it might be time for circuit breaker repair or replacement.

Double-Check the Results

After the initial reading, double-check the results by testing the circuit breaker again. Sometimes, a malfunctioning multimeter or poor contact can cause inaccurate readings. If the issue persists, call local electricians in Greer, SC to test the breaker, diagnose the problem, and recommend the best course of action.

Now that you know the steps to test a circuit breaker using a digital multimeter, you can troubleshoot issues quickly before the technician arrives. Some of the telltale signs your circuit breaker needs attention include frequent tripping, burn marks or smell, and a worn appearance. If you detect these signs, do not hesitate to call Mr. Electric for accurate diagnosis and long-lasting solutions. Contact us today and schedule a consultation with our technicians to ensure your electrical system is in top shape.