USCG Exam PracticeMotor controllers and remote control
According to 46 CFR, the motor disconnecting means on a vessel must be which of the following?
- A. An internally operable fused disconnect rated for the full load current
- ✓ An externally operable switch or circuit breakerCorrect
- C. A thermal overload relay mounted within the controller enclosure
- D. A manually reset contactor accessible only from inside the panel
Why B is correct
46 CFR §111.70-1(c) states explicitly that the motor disconnecting means must be an externally operable switch or circuit breaker. Internal-only or relay-based disconnecting means do not satisfy this requirement.
Cited:46 CFR §111.70-1