USCG Exam PracticeEngine-room safety and hazardous materials
Under 46 CFR §111.106-3, lighting circuits serving explosion-proof fixtures in an enclosed hazardous space must have at least how many lighting branch circuits, and where must the switch and overcurrent device NOT be located?
- A. One branch circuit; the switch must not be located on the weather deck
- ✓ Two branch circuits; the switch and overcurrent device must not be located within the hazardous spaceCorrect
- C. Two branch circuits; the switch must not be located in any accommodation space
- D. Three branch circuits; the overcurrent device must not be located in the engine room
Why B is correct
46 CFR §111.106-3(e) requires at least two lighting branch circuits for enclosed hazardous spaces with explosion-proof or flameproof fixtures, and expressly prohibits the switch and overcurrent device from being located within that space. This ensures the circuit can be de-energized safely from outside the hazardous area.
Cited:46 CFR §111.106-3