USCG Exam PracticeElectrical troubleshooting and maintenance
Under 46 CFR §111.95-3, what restriction applies to a main line emergency disconnect switch that is accessible to unauthorized persons?
- A. It must be fitted with a key-operated rotary switch that locks in both the open and closed positions
- ✓ It must have a means to lock the switch in the open-circuit position, and must not lock in the closed-circuit positionCorrect
- C. It must be enclosed in a locked cabinet and operable only by a licensed engineer
- D. It must be fitted with an alarm that sounds whenever the switch is operated
Why B is correct
46 CFR §111.95-3(b) requires that each main line emergency disconnect switch accessible to an unauthorized person have a means to lock the switch in the open-circuit position with a padlock or equivalent, and explicitly states the switch must not lock in the closed-circuit position.
Cited:46 CFR §111.95-3