A construction project mandates that a tower crane maintain a minimum 3.0 m clearance from an adjacent overhead power line, which is located in a fixed position. The crane's current slewing limit is 360 degrees. To comply with this regulation (e.g., Ontario O. Reg 213/91, Section 183), what is the most appropriate action for safe operation near the power line?

Question: A construction project mandates that a tower crane maintain a minimum 3.0 m clearance from an adjacent overhead power line, which is located in a fixed position. The crane's current slewing limit is 360 degrees. To comply with this regulation (e.g., Ontario O. Reg 213/91, Section 183), what is the most appropriate action for safe operation near the power line?

Answer options: ✅ Implement a programmatic slewing limit zone in the crane's control system, restricting rotation to prevent encroachment.

• Train the operator to visually estimate the clearance and stop before encroachment.
• Mark the ground with yellow paint to indicate the hazard area.
• Assign a dedicated signal person to constantly monitor the clearance.

Correct answer: Implement a programmatic slewing limit zone in the crane's control system, restricting rotation to prevent encroachment.

Explanation: Implementing a programmatic slewing limit directly into the crane's control system is the most effective and reliable method to ensure the 3.0 m minimum clearance is always maintained and cannot be accidentally breached. This provides a hard stop and is often a regulatory requirement (e.g., Ontario O. Reg 213/91, Section 183) for permanent prevention, rather than relying solely on human vigilance.