USCG Exam PracticeMotor controllers and remote control
Under 46 CFR §111.70-7, a conductor of a remote control circuit of a motor controller is NOT required to be protected against overcurrent in which situation?
- A. The conductor runs between two separate motor-control centers
- ✓ The conductor is wholly within the controller enclosureCorrect
- C. The circuit voltage exceeds 24 volts
- D. The branch circuit overcurrent device is rated at 400 percent of the conductor's current-carrying capacity
Why B is correct
46 CFR §111.70-7(a)(1) exempts conductors that are wholly within the controller enclosure from the overcurrent protection requirement. A branch circuit device rated at 400 percent would not qualify; the threshold is not more than 300 percent per §111.70-7(a)(2). Conductors running between separate enclosures are not exempt.
Cited:46 CFR §111.70-7