Which safety measure must be connected around the orchestra lift to prevent unauthorized operation?

• A. A barrier
• B. A monitoring camera
• C. A safety tether
• D. The lockout contacts must be connected

Answer: (D)

Preventing unauthorized operation relies on isolating the lift from its power and control circuits so it cannot move unless an authorized person removes the lock. Lockout contacts wired into the control system create a zero-energy state: when a lock is in place by a supervisor or technician, the lift cannot be energized or commanded to operate. This directly stops any movement regardless of other devices that might be present.

Barriers or cameras can deter or monitor access, but they don’t guarantee the lift isn’t activated. A barrier might be bypassed, and a camera only records what happens. A safety tether protects a person from falling, not the equipment from being operated. The lockout contacts approach provides a definitive, enforceable control that prevents unauthorized use until the proper authorization is acknowledged and the lock is removed.