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Circuit breakers are an important part of home safety. If installed correctly, the circuit breaker plays a vital role in protecting the electrical system of your home or commercial facility.

All circuits are controlled and protected by the circuit breakers.  If there is an overload, short or ground in the circuit, the breaker will detect the fault and open (kill) the circuit.  The purpose is twofold: prevent fire; prevent electrical shock.  

TROUBLESHOOTING BREAKERS AND CIRCUITS

One of the most common situations occurs when the electricity goes out in a certain area of the home but the breaker doesn’t seem to have opened the circuit. A breaker switch can sometimes open a circuit without its mechanical handle flipping off. You should first try to manually switch the breaker off and then back on. It’s also possible the current was interrupted somewhere other than the breaker due to faulty wiring. In this case, an electrician will probably need to come, run tests, and determine the nature of the open circuit and where the break has occurred. You should never attempt to replace a circuit breaker switch unless you have electrical expertise. Improperly replacing a switch can easily lead to much larger problems in your electrical wiring.

GROUND FAULT CIRCUIT INTERRUPTERS (GFCI Breakers)

The GFCI is designed to protect people from severe or fatal electric shocks while the AFCI (below) protects against fires caused by arcing faults. The GFCI also can protect against some electrical fires by detecting arcing and other faults to ground but cannot detect hazardous across-the-line arcing faults that can cause fires. A ground fault is an unintentional electric path diverting current to ground. Ground faults occur when current leaks from a circuit. How the current leaks is very important. If a person’s body provides a path to ground for this leakage, the person could be injured, burned, severely shocked, or electrocuted. More than two-thirds of household electrocutions can be prevented by this inexpensive device. 

The National Electrical Code requires GFCI protection for outdoor outlets; in bathrooms, garages, kitchens, crawling spaces and unfinished basements; and in some locations, such as near swimming pools. Only a combination of specially labeled as a combination of equipment, AFCI and GFCI can be used to meet NEC's requirements for GFCI protection.

Article from:

https://www.abchomeandcommercial.com/