When you see power lines stretching between tall towers, have you ever wondered how the conductors stay securely in place? One key component behind this is the suspension clamp.
What is a Suspension Clamp?
A suspension clamp is a type of electrical fitting used to hang conductors or ground wires on suspension insulator strings of straight-line towers. It mainly bears vertical loads such as the conductor’s own weight and wind pressure.
What Does It Do?
- Supports the conductor by attaching it to the insulator string;
- Allows limited movement to reduce mechanical stress caused by wind or temperature changes;
- Damps vibration in some designs, protecting the conductor from fatigue
Common Types
Type Description Boat-type clamp (U-bolt) Simple structure, low cost, widely used for standard conductors Preformed clamp Uses helical rods to wrap the conductor, reducing stress concentration; ideal for OPGW or ADSS cables Where Is It Used?
- Overhead transmission lines in flat or hilly terrain;
- Substation exits and entries;
- Special cases like river crossings or fiber optic cable installations.
In Summary
Though small, suspension clamps play a critical role in ensuring the safety and stability of power transmission systems. They’re not just “hooks” — they’re guardians of the grid. Next time you pass by a power line, take a closer look — those metal pieces holding the wires are suspension clamps at work.
