What must the stop motion switch contacts open when activated on a rack and pinion driven material hoist?

Prepare for the TSSA Elevating Devices Mechanic – Class F (EDM-F) License Exam. Engage with flashcards and multiple choice questions, each offering hints and explanations. Ace your exam effortlessly!

The stop motion switch is an essential safety device in the operation of a rack and pinion driven material hoist. When the stop motion switch contacts open upon activation, they are specifically designed to cut off the power supply to the motor. This action is critical for ensuring the hoist stops functioning immediately, preventing any potential hazardous situations or equipment failure.

Cutting power to the motor effectively halts the operation of the hoist, ensuring that operators and bystanders remain safe from unintended movement during service or in response to an emergency. The switch serves as a crucial fail-safe mechanism, allowing for quick intervention if issues arise.

The other options, while related to hoist operation, do not directly address the specific function of the stop motion switch in relation to the power cut to the motor. Understanding the precise role of the stop motion switch is vital for maintaining safety standards and effective operation of the elevating device.

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