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but what if the green wire breaks, or the device is used on a two-wire extension cord with no grounding conductor There are numerous ways that the purpose of the green wire can be circumvented. To protect against these accidents, an ingenious type of circuit breaker is recommended for all AC outlets located in head, galley, machinery space, or on deck. Figure 7.10 demonstrates the operation of a ground fault circuit interrupter (GFCI). In a normally functioning AC circuit, current ow through the hot (black) and neutral (white) conductors is equal and opposite. The green grounding conductor is connected to the neutral conductor at the point of origin (the distribution panel), but not at the individual receptacles and devices. Thus, the green wire does not normally carry any current. Every electron owing in the hot conductor is intended to be returned by the neutral conductor. Any difference in current between the hot and neutral conductors must, therefore, represent a stray (dangerous) current. In the GFCI both hot and neutral conductors pass through a circular magnet. Current in the hot conductor induces a magnetic eld in the magnet, but the equal and opposite current in the neutral conductor induces the opposite magnetic eld. The net magnetic eld is thus zero.

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Figure 13-8