Which devices utilize a positive means to hold an emergency isolating device in the safe position?

• A. Push-Button, Switch and Lever
• B. Combination or Key, Lockout and Tagout
• C. Locking Pliers, Wrenches, and Hammers
• D. Padlock, Cable Tie and Seal

Answer: (B)

A positive means to hold an emergency isolating device in the safe position means a physical lock or locking device that prevents the device from being operated. Lockout and tagout equipment are designed for this purpose: they use locking devices (like combination or key locks) together with lockout devices to secure switches, valves, or other isolating devices so they cannot be opened or re-energized until the lock is removed by an authorized person. This creates a visible, mechanical barrier that ensures the system stays in the safe state while work is performed.

The other options describe actuators (push buttons, switches, levers) or tools (locking pliers, wrenches, hammers) that do not by themselves provide a guaranteed, positive lock to keep equipment in a safe condition. A padlock, cable tie, or seal alone isn’t enough to ensure positive protection unless used as part of a proper lockout/tagout assembly; the concept here specifically aligns with devices designed for lockout/tagout that physically hold the isolating device in the safe position.