Which of the following devices would be forbidden to use as a primary means of electrical isolation?

Correct Answer: Option A — start/stop pushbutton station

Start/stop pushbutton stations control auxiliary control circuits via contactors and are strictly forbidden as primary means of electrical isolation under 46 CFR Subchapter J and IEEE 45. True isolation requires physical, visible, and rated gang-operated switches or circuit breakers capable of interrupting load and fault currents safely.