USCG Exam PracticeMotor controllers and remote control
Per 46 CFR §111.70-3(c), which motor controller is exempt from the requirement to have low-voltage protection?
- A. A controller for a steering gear motor rated at 5 horsepower
- ✓ A controller for a motor rated at less than 2 horsepower (1.5 kW)Correct
- C. A controller for a cargo pump motor on an ungrounded system
- D. A controller for any motor connected to a reduced-voltage starter
Why B is correct
46 CFR §111.70-3(c) exempts from the low-voltage protection requirement any motor controller that already has low-voltage release under §111.70-3(b), and any controller for a motor of less than 2 horsepower (1.5 kW). Motor rating, not starter type or system grounding, determines this exemption.
Cited:46 CFR §111.70-3