Question 403Electricity & Electronics - Assistant Engineer

The correct answer is C) Action of door open limit switch (LSO). When a watertight door is wedged open, the door open limit switch (LSO) is activated, which automatically stops the motor that controls the door. This is a safety feature designed to prevent the door from closing on someone or something that is obstructing the doorway. The other answer choices are incorrect because: A) Momentarily depressing the close push button switch would not automatically stop the motor, B) The motor overload (OL) protects the motor from overheating but does not automatically stop it when the door is open, and D) The door closed limit switch (LSC) is used to stop the motor when the door is fully closed, not when it is open.