What is the purpose of lockout procedures in rigging?

• A. To permit operation during service
• B. To adjust tensions
• C. To mark maintenance time
• D. To prevent operation by isolating energy source

Answer: (D)

Lockout procedures are about stopping any unexpected movement by removing all sources of energy from the equipment before someone works on it. In rigging, that means shutting off and isolating electrical power, depressurizing hydraulics or pneumatics, and securing any stored energy or potential motion so the rigging gear can’t start up or move while a worker is servicing it. A lock or padlock and a tag are used to show who is performing the work and that the energy must stay isolated until they finish. This prevents injuries from a hoist, winch, or other rigging component starting unexpectedly.

Why this is the right choice: it directly protects people by physically preventing the equipment from being operated during maintenance. The other ideas—allowing operation during service, simply adjusting tensions, or just marking when maintenance occurs—do not prevent unexpected energization and do not provide the same level of safety.