OHTLstringingequipment.com/Stringing-Blocks--Sheaves.html target='_blank'>Stringing Blocks, also known as stringing pulleys, are a fundamental accessory for overhead line stringing. Their primary purpose is to support the conductor or pulling rope as it is being pulled between two transmission towers. They are designed to:

• Reduce Friction: The smooth, rotating sheave (the wheel within the block) minimizes friction, allowing for a smoother pull and reducing the amount of force required from the puller.

• Protect the Conductor: The grooves of the sheave are designed to cradle the conductor, preventing it from being scratched, nicked, or otherwise damaged during the pull. For certain projects, like OPGW, specialized sheaves with protective linings are used to prevent damage to the delicate fiber optic core.

• Facilitate Installation: They are available in various sizes and configurations (e.g., single, two, three, or four sheaves) to accommodate different conductor types and bundle arrangements, making it easier to install multiple conductors at once.