USCG Exam PracticeSwitchboards and distribution systems
According to 46 CFR §111.95-3, a main line emergency disconnect switch that is accessible to an unauthorized person must have what feature?
- A. A means to lock the switch in the closed-circuit position with a padlock or equivalent
- ✓ A means to lock the switch in the open-circuit position with a padlock or equivalent, and the switch must not lock in the closed-circuit positionCorrect
- C. A key-operated selector that allows locking in either the open or closed position
- D. A tamper-evident seal that must be broken before the switch can be operated
Why B is correct
46 CFR §111.95-3(b) requires that a main line emergency disconnect switch accessible to unauthorized persons have a means to lock it in the open-circuit position with a padlock or equivalent, and explicitly states the switch must not lock in the closed-circuit position. Locking in the closed position would defeat the safety purpose of the disconnect.
Cited:46 CFR §111.95-3