Which side should the 35kV overhead line fiber optic cable be placed on

For a 35kV overhead line, OPGW fiber optic cables are typically installed at the top of the transmission structure as a ground wire, while ADSS cables can be installed in the power space with proper clearance.OPGW (Optical Ground Wire) Installation

OPGW cables are designed to serve as both a grounding conductor and a fiber optic communication medium. On a 35kV line, the OPGW is generally installed at the top of the transmission tower or pole, above the phase conductors. This placement ensures:

• Electrical safety by maintaining separation from live conductors.
• Protection from environmental hazards such as wind and ice.
• Optimal signal performance since the cable is less exposed to electromagnetic interference from the power lines .

ADSS (All-Dielectric Self-Supporting) Cable Installation

ADSS cables do not conduct electricity and can be installed closer to the phase conductors, often in the power space, but only by qualified personnel. Key considerations include:

• Maintaining minimum clearance from energized conductors to prevent arcing.
• Ensuring sufficient sag and tension to avoid mechanical stress.
• Avoiding contact with other cables, trees, or structures along the span .

General Best Practices

• Clearance: All aerial fiber cables must be installed with adequate vertical and horizontal clearance from power lines and other obstacles.
• Sag and Tension: The cable sag should generally be less than 2% of the span length, and tension should not exceed 30% of the cable's minimum breaking strength .
• Secure Attachment: Cables must be securely lashed to the messenger or tower hardware, with no loose hanging sections.
• Permits and Coordination: Installation must comply with local regulations and utility requirements, including pole readiness and route surveys .

Summary

• OPGW: Top of the pole/tower, above phase conductors, serving as ground wire.
• ADSS: Can be installed in the power space with proper clearance and by trained personnel.
• All installations must follow safety standards, maintain proper sag and tension, and avoid obstructions . This ensures both electrical safety and reliable fiber optic performance on 35kV overhead lines.