For what purposes are parted blocks commonly used?

Parted blocks are commonly used for sagging conductors, setting poles, and hanging pole line equipment due to their unique design and function in rigging operations. Parted blocks, or block and tackle systems, allow for multiple lines to create a mechanical advantage, thereby distributing weight and achieving greater control over the lifting and positioning of items.

In the context of sagging conductors, parted blocks provide a method for creating tension in the wire and maintaining proper alignment and height, which is critical for the stability and safety of overhead lines. When setting poles, these blocks can aid in applying the necessary force to raise and secure the poles into position. Additionally, when hanging pole line equipment, the ability to maneuver and adjust the equipment's positioning using a parted block system is essential for ensuring the proper functioning of utilities.

The other options do not encompass the broader applications of parted blocks. While they may hold weight and assist with lifting, their specific design and purpose extend beyond merely handling heavy objects to include a variety of tasks important in rigging and utility work.