Question 405Electricity & Electronics - Assistant Engineer

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As shown in the illustration of an electrically operated watertight door controller, how is the motor stopped automatically when the door is wedged closed? Illustration EL-0115

Diagram for USCG Electrical Assistant: As shown in the illustration of an electrically operated watertight door...
AMomentarily depressing open push button switch.
BAction of door open limit switch (LSO).
CAction of motor overload (OL).
DAction of door closed limit switch (LSC).
AI Explanation

The correct answer is D) Action of door closed limit switch (LSC). When an electrically operated watertight door is fully closed, the door closed limit switch (LSC) is activated, which automatically stops the motor that drives the door. This is a safety feature designed to prevent damage to the door or the motor if the door becomes wedged or obstructed while closing. The other options are incorrect because they do not directly address the automatic stopping of the motor when the door is fully closed.

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Official Resources
46 CFR Electrical Engineering 46 CFR Machinery & Electrical USCG National Maritime Center
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