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On which side is the fiber optic cable typically located for a 35kV power line

Fiber and communications infrastructure knowledge brief Published 05 Sep 2026

Prepared for preliminary research by the ALFA PRO knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

Fiber optic cables on 35kV power lines are typically installed as an optical ground wire (OPGW) at the top of the transmission towers, above the power conductors.Typical Installation

For 35kV overhead lines, fiber optic cables are usually installed in one of two forms:

  1. Optical Ground Wire (OPGW): This is the most common method. The OPGW cable is mounted at the top of the transmission towers, serving both as a grounding wire and a communication medium. It runs above the high-voltage conductors, providing lightning protection while housing optical fibers for data transmission .
  2. All-Dielectric Self-Supporting (ADSS) Cable: In some cases, ADSS cables are used. These are non-metallic, self-supporting cables that can be installed alongside or slightly below the power conductors, but still typically above the ground for safety and clearance .
Separation and Safety Considerations

Even though fiber is non-conductive, proper separation from power conductors is recommended for safety and maintenance. For medium-voltage lines (1kV–35kV), a minimum separation of about 300 mm (12 inches) is generally advised if the fiber runs parallel to the power conductors . When installed in cable trays or along conductors, the fiber should be kept on one side, with power conductors on the other, and metal dividers may be used if sharing the same support structure .

Installation Practices
  • OPGW cables are strung between tower tops, similar in appearance to aluminum-conductor steel-reinforced (ACSR) shield wires .
  • Special care is taken to maintain minimum bending radii and avoid mechanical stress during installation .
  • ADSS cables are tension-resistant and self-supporting, allowing installation without metallic support . In summary, for a 35kV power line, the fiber optic cable is typically located at the top of the towers as an OPGW, above the power conductors, ensuring both grounding and communication functions while maintaining safe separation from the energized lines.

On which side is the fiber optic cable typically located for a 35kV power line - ALFA PRO COMMUNICATION SYSTEMS (Pty) Ltd [PDF]

On which side is the fiber optic cable typically located for a 35kV power line

Optical attached cable

OverviewUsesEtymologyHistoryTechnologyLashed cableAlternativesIn the media

Wrapped cable systems are used in building telecommunications networks over power utility rights of way. This is an attractive concept for many power utilities because it means that the communications network is under their own control and can be tailored to meet their particular requirements with suitable attributes such as redundancy, latency and bandwidth. Once built, the network is relatively inexpensive to operate compared to rental charges previously paid to phone companies. The network connects direct

Optical fiber

An optical fiber, or optical fibre, is a flexible glass or plastic fiber that can transmit light from one end to the other. Such fibers are

Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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