Trace Engineering Mariner - Typical Marine AC and DC Electrical System; Figure 6, Typical AC & DC System

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Ground Fault Circuit Interrupter (GFCI): A device that functions to de-energize a circuit or portion
thereof when a current to ground exceeds some predetermined value that is less than that required
to operate the overcurrent protective device of the supply circuit. GFCI’s are intended to protect
people from electrical shock.
Typical Marine AC and DC Electrical System
The diagram below is intended to graphically illustrate a typical AC and DC electrical system
commonly found on vessels. This diagram is not intended as a guide for wiring a boat, but only as
an informational and instructional aid. Not all vessels will be equipped with all of the components
shown, nor does the illustration include all equipment that may be found on a vessel.
Figure 6, Typical AC & DC System