To find the cause, remove all loads from the circuit. If a circuit breaker trips, the cause is likely either a short circuit or an overload. These are also required in hospitals where sensitive medical monitors may be affected by grounding noise in the wiring which can cause disruption in their critical functions. This arrangement is used for computers and sensitive A/V equipment such as a home theater to eliminate noise interference in the audio and video output that can be caused by the random electrical activity on the grounding wires throughout a dwelling's electrical system. When connecting the wires, the isolated ground wire (the red wire pictured here) is marked with green tape or paint on each end and connected to the grounding bar in the service panel and to the grounding terminal on the receptacle. The receptacle can be identified by the orange color and a small triangle imprinted on the face. The bare copper ground wire is NOT connected to the receptacle, instead it is connected to the grounding terminal inside the metal outlet box where the receptacle is housed.Ī special isolated-ground receptacle is require for this circuit and is connected to a standard circuit breaker. The other cable wires are connected as with any other branch circuit except for the ground wire. It is connected to the grounding terminal on the receptacle and the ground bar in the breaker box. In a 15 amp circuit, the red wire in a 14/3 cable is used for this purpose and marked green at both ends. Wiring for a 15 Amp Isolated Ground CircuitĪn isolated-ground receptacle makes use of an extra wire to provide a separate, dedicated ground in the circuit.
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