Stringing "tree wire" (also known as covered or insulated conductors) on overhead distribution lines differs significantly from bare conductor stringing, primarily due to the protective coating on the conductor. This coating enhances safety and reliability, but requires specialized handling:

• Protection of Insulation: The primary difference is the need to protect the conductor's insulation/covering from damage during stringing. Unlike bare conductors, which can tolerate some friction, tree wire's polymeric coating is susceptible to cuts, abrasions, and crushing if not handled properly.

• Specialized Stringing Blocks (Sheaves): Our stringing blocks for covered conductors feature:

  • Non-Metallic Liners: Made from materials like polyurethane, nylon, or other high-molecular-weight polymers, these liners prevent direct metal-on-insulation contact, eliminating nicks, scrapes, and punctures that could compromise the conductor's protective layer.

  • Wider Grooves: Often with a U-shape or V-shape to cradle the conductor securely without pinching or deforming the insulation, accommodating the larger overall diameter of covered conductors.

• Lower Tension Requirements: While tension stringing is still used, the required tension for distribution lines is generally lower than for transmission lines. Our hydraulic tensioners provide precise, continuous control even at these lower tension ranges.

• Careful Pulling Procedures: Pulling speeds must be controlled to minimize dynamic stress on the conductor and its insulation. Operators must be highly attentive to ensure the conductor is not dragged over sharp edges or twisted.

• Insulated Tools and Personal Protective Equipment (PPE): While the conductor is covered, safety protocols still emphasize insulated tools and appropriate PPE, especially when working near energized lines, as the covering is primarily for abrasion resistance and not full insulation for direct contact.

Our company provides a full range of tension stringing equipment, including specialized stringing blocks and accessories, meticulously designed for the safe, efficient, and damage-free installation of various types of covered conductors on distribution networks.