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 B — totally darkened switchboard ground-detecting light

In an ungrounded shipboard distribution system governed by IEEE 45, a single line-to-ground fault lowers the potential of that phase to hull ground. This causes the associated phase indicating lamp on the switchboard ground detection set to darken completely while the others brighten.