Dedicated Spotter
Spotters have one of the most important responsibilities when the crane is working close to power lines.
Crane hits power line.
The employer should ensure a dedicated spotter meets the following:
- be equipped with a visual aid (a clearly visible line painted on the ground or a clearly visible line of stanchions) to assist in identifying the minimum clearance distance;
- be positioned to effectively gauge the clearance distance;
- where necessary, use equipment that enables the spotter to communicate directly with the operator;
- give timely information to the operator so that the required clearance distance can be maintained; and
- be trained to be able to perform his/her duties effectively.
Operation Below Power Lines Generally Prohibited
No part of the equipment, load line, or load (including rigging and lifting accessories) is allowed below a power line unless:
- The employer has confirmed that the utility owner/operator has de-energized and visibly grounded the power line at the worksite.
- The highest point of the equipment's boom, even if completely extended and vertical, will be more than the required minimum distance from the power line.
Diagram Identifying the Work Zone
The diagram illustrates a simple solution related to power-line safety under 1926.1408.
Diagram Identifying the Work Zone
- The job is a bridge replacement on a two-lane road.
- Power lines were initially seven feet from the proposed work.
- The construction company contacted the power company and arranged to move the 12.5 kV line (north) six feet making the minimum clearance 13 feet.
- At the same time, the power company agreed to install cross arms and hang a series of flags parallel to the power line.
- The flags hang from the utility pole at eye level to the operator establishing the crane's work zone.
The demarcation boundary, along with prohibiting the operator from going beyond the boundary, fulfills the requirements for power line safety in 1926.1408.
Knowledge Check Choose the best answer for the question.
4-4. Before a crane is allowed to operate below a power line, what must the employer confirm?
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