What practice helps ensure emergency shut-off devices are functional?

• A. Label and verify operation during monthly checks; no testing required.
• B. Keep them in a locked cabinet inaccessible to operators.
• C. Clearly label, test regularly, and ensure they are accessible.
• D. Only test them after a major incident.

Answer: (C)

Emergency shut-off devices must be ready to function immediately in an emergency. To ensure readiness, they should be clearly labeled so anyone can locate them quickly, tested regularly to confirm they actually operate (not just looked at), and kept accessible so there’s no delay or barrier to using them. This combination reduces reaction time, verifies reliability, and ensures reachability in a real incident. Labeling without actual testing can miss hidden faults; keeping devices in a locked cabinet prevents fast access when needed; testing only after a major incident means the system has already failed in a real event, risking injuries or damage.