What is a Span Clamp?
Span Clamp (also called span wire clamp or mid tension clamp) is a fastener designed for overhead optical cables.
Its function is to firmly fix the optical cable on the load bearing steel strand or power conductor to prevent the optical fiber cable from slipping, excessive sag or vibration fatigue due to gravity, wind or temperature changes.
The span clamp is commonly used for mid section anchoring of ADSS optical cables, FTTH cables, and hybrid power and communication lines.
Structure
Splint body – Made of galvanized steel or aluminum alloy, high mechanical strength.
Bolts and nuts – High strength stainless steel for tension and ease of installation
Guy wire or additional damping arm – Further improve grip and vibration resistance
Advantages of
- Effectively prevent cable sagging
- Can effectively resist wind
- Long service life and low maintenance
- Easy to install
- Can withstand high voltage
and Applicable Scenarios
Medium tension wire clamp(suspension clamp or dead end clamp): Mainly used for cable systems with long spans.
Mainly used for FTTH optical cable lines.
: Mainly used in coastal areas or plain areas with strong winds.
Designed for aerial optical cables, drop cables or phase cables with a diameter of 6-35 mm.
Used for lines with relatively undulating spans.
Used for paralleling of lines above 15kV.
How to Choose the Model of Span Clamp？
- Select the appropriate type of span clamp according to the outer diameter of the required optical cable
- Depending on the environment, in areas with strong winds or snowy areas, choose a span clamp with a special shape that has higher mechanical strength and is more durable.
- Choose the appropriate clamp according to the length or width of the guy wire.
Installation Points
Use a wrench to open the nut buckle, prevent the optical cable from being inserted into the groove of the splint or one end of the deadend, and use a wrench to tighten the bolts and nuts to prevent the span clamp from loosening.（What you need to pay attention to is: do not press the insulation layer of the optical cable）
Common Problems and Solutions
Slippage: Select a smaller clamp size: Replace with a larger one or install pre-twisted wire.
Bolt rust: Use an aluminum alloy or hot-dip galvanized span clamp, ensuring 1-2 threads are exposed.
Tracking: Forgot to use a semi-conductive pad in a high-voltage area: UUse an O-type span clamp and use tracking resistant rubber.
Wind-induced fiber breakage: No damping components are installed: Install an E-arm or spiral damper.