For the purposes of safety and determining the shock hazard, nominal voltage is defined as the normal electrical system design voltage. This can be determined from what is displayed on nameplates, data plates, schematics, or single-line diagrams. What does the nominal voltage represent?

Correct Answer: Option D — average of phase to phase and phase to hull ground voltages

Nominal voltage in marine electrical systems, per IEEE 45 and 46 CFR Subchapter J standards, is established as a reference standard representing the average value of phase-to-phase and phase-to-hull ground potentials for evaluating shock hazards and insulation ratings across marine distribution systems.