Communication Attached Optical Cable

Communication Attached Optical Cable (OPAC) is a fiber-optic cable installed along overhead power lines by attaching it to a host conductor, enabling high-bandwidth communications without major infrastructure changes.Overview

OPAC, also known as optical power attached cable, is an all-dielectric fiber-optic cable designed to be installed along existing overhead power lines by attaching it to host conductors such as phase wires, ground wires, optical ground wire (OPGW), or optical phase conductor (OPPC) ( ). This approach allows utilities to expand telecommunications capacity efficiently while leveraging existing infrastructure.

Installation Methods

The cable is typically installed using wrapping, lashing, or clipping techniques, with wrapped cable systems being the most common. Installation involves specialized equipment, often called a "tug," which moves along the host conductor, wrapping or securing the cable in place ( ). For medium or low voltage lines, the wrapping machine can sometimes be pulled by hand, while high-voltage transmission lines require motorized or radio-controlled units. Each manufacturer may have proprietary systems, so equipment and cable designs are generally not interchangeable ( ).

Cable Design and Features

OPAC cables are lightweight and compact, often using loose-tube fibers with extra length to accommodate wrapping tension, typically about 1 meter per wrap ( ). The cable jacket is engineered to resist abrasion, extreme temperatures, weather exposure, and ice buildup, and special devices are used near high-voltage towers to prevent coronal discharge ( ). Singlemode fibers are commonly used for long-distance immunity to electromagnetic interference, and multiple cables can sometimes be installed on a single conductor.

Applications

OPAC is widely used for network monitoring, power system management, and high-bandwidth communications along electrical grids ( ). Its design allows installation on spans exceeding 2 kilometers and tower heights over 200 meters, often under live-line conditions without interrupting power distribution ( ). This makes it a cost-effective alternative to integrated metallic solutions like OPGW, as it remains fully non-conductive and easier to retrofit.

Advantages

• Non-conductive and safe for installation on live lines
• Lightweight and compact, minimizing additional load on power lines
• Durable against environmental stressors such as ice, wind, and temperature extremes
• Flexible installation on existing infrastructure without major modifications
• Supports high-bandwidth communications for utility and telecommunication applications OPAC has been widely adopted since the 1980s, with installations across multiple continents, providing utilities a reliable and efficient method to integrate fiber-optic communications into power networks ( ).