Guide To Tensioning Operations For Wedge-type Tension Clamps

Tightening overhead lines with a wedge-type tension clamp requires four steps: attach pulling equipment, draw the conductor to calculated sag tension, seat the sliding wedges firmly into the clamp housing, and transfer the load. The self-locking mechanism holds the line through mechanical friction without damaging outer conductor strands.

Preparation and Technical Inspection

Before installation, verify equipment specifications and perform essential hardware checks:

• Match conductor diameter to clamp groove dimensions.

• Inspect wedge surfaces for corrosion or manufacturing defects.

• Verify load ratings on hoisting winches and dynamometers.

• Position telecommunication hardware, including a fiber optic dead end clamp, along adjacent pathways.

Step-by-Step Line Tightening Procedure

Conductor Alignment and Insertion

1. Attach the tensioning winch to the anchor structure and place the pulling grip on the line.

2. Draw the conductor until reaching designated sag tension, measuring force with an inline dynamometer.

3. Open the clamp housing to receive the incoming conductor.

4. Insert the conductor into the wedge cavity while maintaining minimum bend radius limits.

Wedge Seating and Final Locking

5. Drive sliding wedges into the housing to establish contact along the gripping surface.

6. Release winch tension slowly, transferring mechanical load to the internal wedge locking system.

7. Connect the assembly to a fixed dead end clamp fitting on termination structures.

8. Confirm zero conductor movement under full tension load.

Operational Parameters

Post-Installation Inspection Checklist

Complete installation verification using these physical checks:

• Measure total wedge engagement depth inside the main housing shell.

• Confirm torque values on all mechanical fasteners using calibrated wrenches.

• Inspect line transition angles to reduce vibration fatigue on conductor strands.