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Composite Phase-to-Phase Spacer

Composite Phase-to-Phase Spacer, also known as an Interphase Spacer, is a line hardware device used on overhead transmission and distribution lines to keep phase conductors properly separated under wind, ice, galloping, and other dynamic conditions. Built with a fiberglass rod core, silicone rubber housing, and conductor-matched clamps and fittings, it helps prevent phase contact, flashover, strand damage, and outages. These spacers are commonly customized by voltage class, span length, conductor size, and pollution level, and can be installed in horizontal or vertical arrangements for distribution or transmission applications.

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Product Accessories

Conductor clamps are a core accessory, with options such as suspension clamps, K-Clamp™ styles, and adjustable riser arrangements depending on whether the application is distribution or transmission duty.

Armour rods may be added where required to reduce strand fatigue and suit the conductor clamping arrangement.

End fittings / couplings are available in multiple configurations, and some product families can be coupled with silicone-rubber-covered rods to extend overall spacer length.

Live-line installation hardware such as eye nut or eye bolt options is offered on selected designs to support energized-line work.

Grading rings are used on higher-voltage installations, with one source noting their use on 132 kV systems and above.

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Product Specifications

Product type

Composite phase-to-phase spacer / interphase spacer for overhead lines.

Service voltage range

Distribution versions commonly cover 15 kV to 69 kV; transmission versions extend to 69 kV to 400 kV; another published range is 33 kV to 400 kV.

Core material

High-quality electrical-grade fiberglass / E-glass fiberglass rod.

Housing material

One-piece injection-molded silicone rubber chemically bonded to the core.

Mechanical load capability

Designed for torsional, bending, and compression loads in galloping and ice-shedding duty.

Mounting arrangement

Horizontal or vertical.

Spacer length

Project-specific conductor-to-conductor length; selected to suit span length and conductor configuration.

Conductor diameter compatibility

Sized to the conductor diameter, including armour rod where applicable.

Clamp type

Suspension clamp, K-Clamp™, adjustable riser, or other application-specific clamping arrangement.

Standards

Published designs reference IEC 61109, IEC 61284, and related composite-insulator practice; polymeric insulator frameworks also align with IEC 62217, while composite line-post and related overhead-line standards help define test and acceptance requirements.

Product Applications

Economy is more affordable

where conductor approach and galloping can lead to contact or flashover.

Long overhead spans exposed to strong wind and ice
including projects where interphase spacers are used to protect a circuit operating in the 275 kV to 400 kV range.

High-voltage lines with icing and wet-snow corridors
especially where the installation must be done by hot-line tools, helicopter, or barehand methods.

Distribution circuits with live-line maintenance needs
where controlling phase motion is critical to keeping service stable across wide spans.

Long rural transmission routes and renewable-energy tie lines

Product Advantages

Keeps phase conductors separated under dynamic loading

The spacer is built specifically to reduce conductor contact, flashovers, and damage caused by galloping or ice shedding.

Lightweight, durable, and easier to handle in the field

Manufacturer literature highlights silicone rubber construction on a fiberglass core, plus low-weight handling and installation advantages.

Flexible project fit

The design can be tailored for conductor size, span length, pollution level, mounting style, and live-line installation method, which makes it suitable for many overhead line configurations.

FAQ

What is a Composite Phase-to-Phase Spacer used for?

It keeps overhead conductors separated and helps prevent phase contact, flashover, and damage during wind, ice, or galloping conditions.
Where is it typically installed?

It is used on overhead transmission and distribution lines, especially on long spans and in areas with severe weather or conductor motion problems.
What materials is it usually made from?

Most designs use a fiberglass core with silicone rubber housing and application-specific clamps or fittings.