During drilling operations, what is the requirement for personnel on the drill mass?

• A. They may ride if the drill is stopped
• B. They must not be on the drill mass while it operates
• C. They may be on the drill mass with a harness
• D. They must wear a safety vest only

Answer: (B)

During drilling operations, keeping people off the drill mass is essential because moving parts, including the drill head, feed, and hoisting components, can shift, start, or swing unexpectedly. Anyone on the mass could be struck, crushed, or pulled into machinery, and clothing or limbs can become entangled in rotating or reciprocating parts. Wearing a vest or other PPE does not make this safe, and a harness cannot compensate for the hazards of being on a moving platform. The safest practice is to have no personnel on the drill mass while the drill is operating.