When positioning a crane near overhead lines, which practice is essential to prevent contact?

When positioning a crane near overhead lines, which practice is essential to prevent contact?

• A. Maintain a Safe Clearance From Overhead Lines Per AF/OSHA Standards.
• B. De-energize Lines After Lifts Are Complete.
• C. Move Loads Within the Line's Working Envelope If Necessary.
• D. Increase Hoist Speed To Clear Lines Quickly.

Answer: (A)

The essential idea is to prevent any possibility of the crane or its load coming into contact with power lines by keeping a safe, defined distance away. Overhead lines carry high voltage, and a swing, tilt, or drift of the boom or load can close the gap in a split second, causing electrical contact or an arc that can injure workers and damage equipment. That’s why the standards specify minimum clearance distances based on line voltage and equipment, and you plan the lift to keep the crane, hook, and load outside that zone at all times. A trained spotter should continuously monitor the clearance and help position the crane to maintain that safe distance. If the lines cannot be kept clear, the lift should not proceed until the lines are de-energized or otherwise isolated or rerouted, coordinated with the utility. Rushing the lift or moving the load within the line’s working envelope increases risk and does not provide a reliable safeguard, and increasing hoist speed offers no protection against contact. Maintaining the established safe clearance is the reliable, preventive practice.

The essential idea is to prevent any possibility of the crane or its load coming into contact with power lines by keeping a safe, defined distance away. Overhead lines carry high voltage, and a swing, tilt, or drift of the boom or load can close the gap in a split second, causing electrical contact or an arc that can injure workers and damage equipment. That’s why the standards specify minimum clearance distances based on line voltage and equipment, and you plan the lift to keep the crane, hook, and load outside that zone at all times. A trained spotter should continuously monitor the clearance and help position the crane to maintain that safe distance. If the lines cannot be kept clear, the lift should not proceed until the lines are de-energized or otherwise isolated or rerouted, coordinated with the utility. Rushing the lift or moving the load within the line’s working envelope increases risk and does not provide a reliable safeguard, and increasing hoist speed offers no protection against contact. Maintaining the established safe clearance is the reliable, preventive practice.