USCG Exam PracticeEngine-room safety and hazardous materials
Under 46 CFR §111.106-3(e), lighting circuits serving explosion-proof or flameproof fixtures in an enclosed hazardous space must meet several requirements. Which of the following is specifically required?
- A. The switch and overcurrent device must be located inside the hazardous space for immediate access
- B. A single lighting branch circuit is sufficient provided it is rated for the full connected load
- ✓ The switch and overcurrent protective device must open all ungrounded conductors of the circuit simultaneouslyCorrect
- D. Lighting circuits in hazardous spaces are exempt from overcurrent protection requirements
Why C is correct
46 CFR §111.106-3(e)(4) requires that the switch and overcurrent protective device must open all ungrounded conductors of the circuit simultaneously. Additionally, §111.106-3(e)(3) prohibits placing the switch and overcurrent device within the enclosed hazardous space — the opposite of option A — and §111.106-3(e)(1) requires at least two lighting branch circuits, not one.
Cited:46 CFR §111.106-3