What are the types of fiber optic cable suspension strings

Fiber optic cable suspension strings include suspension clamps, tension clamps, anchor clamps, messenger clamps, and preformed hardware designed to support and protect cables in aerial installations.

Suspension Clamps

Suspension clamps are used to hold the cable along straight-line spans, reducing bending and mechanical stress. They are typically made of aluminum alloy or anti-UV polymer with protective inlays like neoprene to prevent abrasion. Common types include AXC-100/12, AXC-200/13, AXC-400/13.0, AXC-500/14, and they are classified by the span and tension requirements of the cable. These clamps are preformed and designed to withstand vertical loads without causing stress concentrations on the fiber optic cable .

Tension Clamps (Dead-End Clamps)

Tension clamps, also called fiber optic dead-end clamps, are installed at the ends of spans or at directional changes. They provide a rigid hold, transferring mechanical loads to poles or towers. These clamps often include preformed helical rods and corrosion-resistant fittings to protect fibers from stress. They are suitable for distribution networks with spans up to 150 meters and are engineered for specific cable diameters, typically between 8 to 20 mm .

Anchor and Down Lead Clamps

Anchor clamps, or down lead clamps, are used to fasten cables vertically along poles or towers. They prevent slipping, vibration, and movement, ensuring the cable remains securely in place. These clamps are designed for easy installation without special tools and are compatible with various cable diameters .

Messenger Clamps

Messenger suspension clamps are primarily used on straight-line towers to suspend the optical cable while protecting it from damage during installation and operation. They are similar to suspension clamps but are optimized for mechanical support along the cable span .

Preformed Suspension Hardware

Preformed hardware kits are used to secure the conductor in the insulating cord of towers or to hang cables on straight-line towers. They often feature hyperbolic waist damping pads to grip the cable with minimal stress, suitable for high-voltage lines, long spans, and areas prone to ice or extreme weather .

Summary

In aerial fiber optic installations, the main types of suspension strings include:

• Suspension clamps: support cables along spans, reduce bending stress
• Tension (dead-end) clamps: secure cables at span ends or directional changes
• Anchor/down lead clamps: fasten cables vertically on poles or towers
• Messenger clamps: provide mechanical support along straight-line towers
• Preformed hardware: specialized kits for high-load or long-span applications Each type is designed to protect the fiber, maintain mechanical integrity, and ensure long-term reliability of the network .