Current then leaves the house on a large neutral service wire that returns it to the utility transformer.Įlectricity always seeks t o return to its source and complete a continuous circuit. Current returns to the service panel along a neutral circuit wire. A fuse or a circuit breaker protects each circuit in case of overloads. If a circuit carries too much current, it can overload. The service panel also has a bonding wire connected to a metal water pipe and a grounding wire connected to a metal grounding rod, buried underground, or to another type of grounding electrode. The grounding wire conducts current in the event of a ground fault and helps reduce the chance of severe electrical shock. For safety, all modern circuits include a bare copper or green insulated grounding wire. Hot wires are black or red, and neutral wires are white or light gray.
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