USCG Exam PracticeMotor controllers and remote control
Under 46 CFR §111.70-3, a motor controller for a fire pump must have low-voltage release rather than low-voltage protection when which condition exists?
- A. The fire pump motor exceeds 2 horsepower (1.5 kW)
- ✓ Automatic restart after a voltage failure or its resumption to operation is not hazardousCorrect
- C. The controller is located in a hazardous area as defined by subpart 111.105
- D. The starting current of the fire pump exceeds the capacity of one ship's service generator
Why B is correct
46 CFR §111.70-3(b) requires low-voltage release for fire pump, elevator, steering gear, and vital propulsion auxiliary controllers when automatic restart after a voltage failure or its resumption to operation is not hazardous. If automatic restart is hazardous, low-voltage protection is required instead.
Cited:46 CFR §111.70-3