USCG Exam PracticeEngine-room safety and hazardous materials
Under 46 CFR §111.106-3, 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 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 simultaneouslyCorrect
- D. Ground fault circuit interrupters must be installed on each branch circuit within the space
Why C is correct
46 CFR §111.106-3(e)(4) requires that the switch and overcurrent protective device for lighting circuits in enclosed hazardous spaces must open all ungrounded conductors of the circuit simultaneously. Additionally, §111.106-3(e)(3) prohibits placing the switch and overcurrent device within the space, making option A incorrect.
Cited:46 CFR §111.106-3