In an ungrounded distribution system, as compared to a normal indication, what is the indication on a switchboard of a current carrying conductor making an accidental electrical contact with a wiring metal conduit?

Correct Answer: Option C — totally darkened switchboard ground-detecting light

An accidental solid ground on one phase of an ungrounded marine distribution system short-circuits that phase to the hull, forcing the corresponding ground-detecting lamp across zero potential difference, causing it to go completely dark.