Moving the two outside phases in sync keeps the crossarm from becoming what?

Moving the two outside phases in sync keeps the crossarm from becoming what?

• A. Bending
• B. Warping
• C. Becoming racked
• D. Overheating

Answer: (C)

Keeping the two outer phases moving together prevents the crossarm from twisting out of its proper alignment. When the outer conductors are moved in opposite directions or at different rates, the forces on the insulators and hardware can torque the crossarm, causing it to rack—that is, tilt or misalign relative to the pole. Moving them in sync keeps everything in the same plane, preserving clearance and reducing stress on the insulators and attachments. Bending or warping would require different kinds of mechanical deformation, and overheating is a thermal issue not caused by how the phases are moved.

Keeping the two outer phases moving together prevents the crossarm from twisting out of its proper alignment. When the outer conductors are moved in opposite directions or at different rates, the forces on the insulators and hardware can torque the crossarm, causing it to rack—that is, tilt or misalign relative to the pole. Moving them in sync keeps everything in the same plane, preserving clearance and reducing stress on the insulators and attachments. Bending or warping would require different kinds of mechanical deformation, and overheating is a thermal issue not caused by how the phases are moved.