Breakers are switches that automatically cut off electric current when an overload or some other anomaly occurs. They prevent circuits from overheating, for instance because of a wiring problem or a defective appliance. Each breaker is linked by three wires to a series of outlets or connection boxes along a circuit.
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Some dedicated circuits have only a single outlet or connection box–for example, the refrigerator and the water heater. Other circuits are wired to outlets with ground fault circuit interrupters, such as bathroom outlets, to provide added protection against electricity-related accidents in the home.
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The live or "hot" wire delivers electric current. The neutral, or "return," and the ground have a safety function. The neutral and the ground are hooked up to the same breaker terminal, which is connected to the grounding system of the distribution panel.
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