Where automatic restart does not present a hazard after a power failure, according to 46 CFR, Subchapter J (Electrical Engineering), it is required that motor controllers for auxiliaries vital to the propulsion equipment to be provided with what type of protection?
• 46 CFR Subchapter J requirements for vital auxiliary motor controllers after a power failure • Difference between low voltage protection and low voltage release in motor control circuits • When automatic restart of a motor is considered hazardous vs. acceptable
• Ask yourself: after a temporary power dip, should a vital auxiliary come back on automatically, or should it require a manual restart to be safe? • Think about which option describes a feature that prevents a motor from restarting automatically when voltage is too low or has just returned. • Consider what type of protection is required specifically by regulation for motors that are essential to propulsion when automatic restart is NOT considered a hazard.
• Verify in 46 CFR Subchapter J which term is defined or used for motors that restart automatically after a power failure (pay attention to wording). • Check the functional difference: does the device trip and stay off on low voltage, or does it allow automatic re-energizing when voltage returns? • Confirm which choice is directly tied in regulations to auxiliaries vital to propulsion rather than to general machinery protection.
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