Insulator String
- Complete suspension or tension insulator string — discs + all hardware
- Assembled to your voltage, M&E class and structure
- Porcelain or glass discs with ball / socket clevis, yoke, clamp
- Single, V and double-tension configurations
- Factory-assembled and tested, ready to hang
- For transmission suspension and dead-end structures
Technical Specifications
| Catalog | Config | System kV | M&E (kN) | Discs | End Hardware |
|---|---|---|---|---|---|
| RAX-IS-S33 | Single suspension | 33 | 70 | 3 | Clevis + clamp |
| RAX-IS-S132 | Single suspension | 132 | 120 | 9 | Clevis + clamp |
| RAX-IS-V220 | V suspension | 220 | 120 | 14×2 | Yoke + clevis |
| RAX-IS-T132 | Tension | 132 | 120 | 9 | Yoke + tension clamp |
| Custom | Other voltages / configs / disc types — send your structure & conductor | ||||
Application & Installation
Where it is used
The insulator string is a complete, factory-assembled set of discs plus all the string hardware — ball / socket clevises, yoke plate and the suspension or tension clamp — supplied ready to hang on the tower. Specified by voltage, M&E class and configuration, it removes the field assembly and matching of individual parts.
Installation sequence
- Specify voltage, M&E class and configuration (single / V / tension).
- Confirm the disc material and end-hardware coupling.
- Receive the string factory-assembled and tested.
- Hang the structure end on the tower attachment.
- Lay the conductor into the clamp at the string end.
Buyer’s Guide: Insulator String
1. What an Insulator String Is
An insulator string is the whole assembly that insulates and supports the conductor at a structure: the disc stack plus every coupling fitting and the conductor clamp. Supplying it as one tested unit removes the work and error of assembling discs, clevises, yokes and clamps in the field.
2. Configurations
Single suspension for tangents; V-strings to restrain swing on long or angled spans; double-tension for dead-ends. The configuration sets the hardware — a yoke plate for V and double, simple clevises for single.
3. Voltage & M&E
Disc count comes from the system voltage and pollution; M&E class (52-3 / 52-5 / 52-8) from the line tension. We assemble the right count and class so the string meets both the electrical and mechanical duty.
4. Disc Material
Porcelain or toughened glass discs, or a composite long-rod where weight and breakage matter. Specify the type; the coupling and hardware stay the same.
5. Factory Assembly & Test
Strings are assembled and the couplings checked in the factory, so crews hang a complete, verified unit rather than building it aloft — faster, safer and consistent.
6. What We Include
Discs, ball / socket clevises, yoke plate (V / tension), arcing horns or corona ring where specified, and the suspension or tension clamp. Tell us the structure and conductor and we build the string.
