USCG Exam PracticeElectrical safety and general safety
An electrical panel enclosure aboard a vessel is fed from two separate sources of power. What does 46 CFR §183.220 require for that enclosure?
- A. A red indicator lamp must be illuminated whenever both sources are energized simultaneously.
- ✓ A sign must warn persons of the multiple power sources and identify the circuits to be disconnected.Correct
- C. An automatic transfer switch must prevent both sources from being connected at the same time.
- D. The enclosure must be fitted with a lock to prevent unauthorized access.
Why B is correct
46 CFR §183.220(e) requires that any cabinet, panel, box, or other enclosure containing more than one source of power be fitted with a sign warning persons of this condition and identifying the circuits to be disconnected. The regulation does not mandate indicator lamps, transfer switches, or locks for this purpose.
Cited:46 CFR §183.220