What must happen during an outdoor explosives operation equipped with a lightning protection system when a lightning watch is initiated?

• A. Operations continue with caution
• B. Evacuate all personnel
• C. Lightning protection is temporarily disabled
• D. A controlled termination is initiated

Answer: (D)

When a lightning watch is in effect for an outdoor explosives operation that has a lightning protection system, the priority is to bring everything to a safe, controlled state. The risk is a potential lightning strike energizing equipment or initiation circuits, which could cause an unintended detonation or serious damage. Initiating a controlled termination ensures firing systems are safely shut down and munitions are secured so they cannot be inadvertently initiated. This preserves safety and gives responders a stable situation to manage the weather threat.

Continuing operations with caution would still leave the site exposed to unpredictable lightning effects and could lead to mis-timing or accidental initiation. Evacuating all personnel might be appropriate in some urgent scenarios, but the standard procedure tied to a lightning watch is to secure and terminate the operation safely rather than moving people away as the primary action. Disabling the lightning protection system would remove a key safeguard when a lightning threat is present, increasing risk.