USCG Exam PracticeElectrical safety and general safety
A switchboard panel aboard a vessel is supplied by two independent sources of power. What marking requirement applies to this enclosure?
- A. A placard identifying the voltage and current rating of each source
- ✓ A sign warning that more than one power source is present and identifying the circuits to be disconnectedCorrect
- C. A label indicating the enclosure is explosion-proof per 46 CFR part 111
- D. A color-coded band on each feeder cable entering the enclosure
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 must be fitted with a sign warning persons of this condition and identifying the circuits to be disconnected. This is a personnel safety measure to prevent inadvertent energization during maintenance.
Cited:46 CFR §183.220