What is a limit switch on rigging equipment?

• A. A manual override handle
• B. A device that stops movement when a traverse reaches its limit to prevent over-travel and damage
• C. A switch that turns off the power
• D. A sensor that measures cable tension

Answer: (B)

A limit switch is a safety device that signals the system to stop when a moving rigging element reaches the end of its allowed travel. In practice, as a traverse or other rigging component reaches its limit, the switch is activated and sends a stop command to the drive or brake, preventing over-travel, mechanical damage, or unsafe conditions. This is why the correct choice describes a device that stops movement at a preset limit to protect the equipment.

To compare briefly with the other ideas: a manual override handle is for bypassing safety features and isn’t about stopping at a limit; a switch that turns off power is a generic power switch and doesn’t specifically address travel endpoints; a sensor that measures cable tension monitors load rather than position.