USCG Exam PracticeMotor controllers and remote control
Under 46 CFR §111.70-1, the motor disconnecting means on a vessel must be which of the following?
- ✓ An externally operable switch or circuit breakerCorrect
- B. A fused disconnect accessible only from inside the enclosure
- C. A thermal overload relay with manual reset
- D. A contactor operated by a remote pushbutton station
Why A is correct
46 CFR §111.70-1(c) states that the motor disconnecting means must be an externally operable switch or circuit breaker. Internal-only access, thermal relays, and remote contactors do not satisfy this specific requirement.
Cited:46 CFR §111.70-1