USCG Exam PracticeEngine-room safety and hazardous materials
Under 46 CFR §111.106-3, lighting circuits serving explosion-proof or flameproof lighting fixtures in an enclosed hazardous space must comply with which of the following requirements?
- 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 device must not be located within the space, and must open all ungrounded conductors simultaneouslyCorrect
- D. Circuits must be served by a dedicated generator isolated from the vessel's main switchboard
Why C is correct
46 CFR §111.106-3(e)(3) and (e)(4) require that the switch and overcurrent device must not be within the space for those spaces containing explosion-proof or flameproof fixtures, and that the switch and overcurrent protective device must open all ungrounded conductors of the circuit simultaneously. At least two lighting branch circuits are also required per §111.106-3(e)(1).
Cited:46 CFR §111.106-3