OPGW vs ADSS: Choosing the Right Fibre Cable for Power Lines
OPGW vs ADSS: Choosing the Right Fibre Cable for Power Lines
Posted on June 06, 2026Both OPGW and ADSS put optical fibres on a transmission tower, but they occupy different positions and serve different project situations. The right choice depends on whether the line is new or energised, and whether you need a grounding function. Below is a direct comparison, with Systematic’s OPGW as the reference for the OPGW column.
What each cable is
• OPGW — replaces the conventional earth/shield wire at the top of the tower. It grounds fault and lightning current and carries fibre in one cable. See OPGW: power and data combined.
• ADSS — an all-dielectric (no metal) self-supporting cable lashed to the tower below the live conductors. Because it carries no current, it can often be installed on a live line.
Head-to-head comparison
| Attribute | OPGW | ADSS |
| Position on tower | Top — replaces shield/earth wire | Below live conductors |
| Material | Metallic (ACS + alloy stranding) | All-dielectric (non-metallic) |
| Grounding function | Yes — also a ground wire | No |
| Install on energised line | Usually requires outage | Often possible live |
| Best fit | New lines; shield-wire replacement | Retrofit on existing energised lines |
| Mechanical role | High tension, lightning protection | Self-supporting span, no earth duty |
When to choose OPGW
Choose OPGW for new transmission builds, or when the existing shield wire is due for replacement — you gain communications and grounding in a single asset. Its construction is detailed in OPGW cable construction and specifications.
When to choose ADSS
Choose ADSS when the line is already energised and an outage is impractical, or where a non-metallic cable is preferred for electrical clearance reasons.
Specifying OPGW for a project? Review applications and advantages of OPGW and how to choose an OPGW manufacturer.
Frequently Asked Questions
Can ADSS carry ground current?
No. ADSS is all-dielectric and carries no current; it provides communications only. OPGW additionally serves as the earth/shield wire.
Is OPGW better than ADSS?
Neither is universally better. OPGW suits new builds and shield-wire replacement; ADSS suits retrofits on energised lines where an outage is impractical.
Where is OPGW installed on the tower?
At the very top, in the shield-wire position, where it both grounds fault/lightning current and carries the optical fibres.