• Replacing Optical Ground Wire (OPGW) or All-Dielectric Self-Supporting (ADSS) cables above or near energized high-voltage power lines requires specialized non-conductive tools, controlled tension equipment, and physical crossing protection to eliminate the risk of accidental flashover or contact.

Essential equipment and procedural safeguards include:

1. Insulated Grounding and Anti-Induction Sheaves: OPGW stringing blocks must be fitted with running grounding devices (earthing rollers) that continuously drain induced voltage from the wire to ground during pulling.

2. Specialized Small-Diameter Neoprene-Lined Sheaves: OPGW contains sensitive optical fiber tubes. Sheaves must have a minimum bending radius (typically $\ge 800\text{ mm}$) with soft rubber grooves to prevent fiber attenuation or micro-bending loss.

3. High-Strength Netting & Crossing Protection Systems: Inflatable or modular catch nets suspended between temporary crossing poles prevent a loose pilot line or ground wire from dropping onto live conductors underneath.

4. Micro-Adjust Tension Control: Tensioners must maintain strict constant tension throughout payout, preventing line sag below safe electrical clearance limits.

Ningbo Changshi provides specialized OPGW/ADSS tension stringing machines, aluminum alloy stringing blocks with earthing assemblies, and anti-bending pulling swivels designed for zero-outage live line retrofits.