Which grip is used for attaching the pulling line to the conductor during the stringing operation?

The Kellum grip is specifically designed for attaching a pulling line to a conductor during stringing operations because it provides a secure and reliable connection. This grip is engineered to accommodate the round shape of conductors, allowing for effective load distribution and minimizing the risk of damage to the conductor during the pulling process. It is particularly useful in power line construction and maintenance, where the need for a strong and stable grip is essential to safely manage the tension and weight of the conductor being installed.

In contrast, while the other options involve different tools or components used in overhead line work, they do not fulfill the specific function of securely connecting a pulling line to conductors. The articulated running board is typically used for accessing elevated work areas, blade and prong grips serve different purposes in rigging or lifting, and guard structures are employed for protection and safety but not for connecting lines to conductors. Therefore, the Kellum grip is the proper choice for this task.