Which component closes electrical contacts to enable operation?

• A. Wireless Controls
• B. Chassis Tongue
• C. Mechanical Trip Lever
• D. Final Limit Switch

Answer: (C)

The drive circuit only runs when the control path is closed, letting electrical current reach the motor. The mechanical trip lever is wired into the safety interlock and, in normal operation, maintains that path closed so the control circuit can energize the drive. If a safety condition is detected or the lever is triggered, it opens the circuit to stop the escalator. So, this lever is the component whose normal position provides the closed contacts that enable operation. Wireless controls provide remote signaling but don’t themselves complete the main power path; the final limit switch is used to stop at the end of travel, not to enable operation; and the chassis tongue isn’t the device that closes the control contacts.