Fig. 8.1 Deflection

The deflection is a function of the weight on the cable, the span of the cable and the tension of the cable. A maximum deflection of 0.9% per 100 meters is recommended. This will result in a 0.7 meter deflection on a 75 meter span. The most important factor influencing deflection is that the tension should remain in the cable after the cable has been secured to the poles. A small movement of 50mm can result in reducing the tension in the cable by several hundred kilograms. 

The recommended cable size and the maximum tension are:

  Fig. 8.2 Cable size 

·         Calculated at a 100% safety margin.

By using the formula and tables below it is possible to calculate the deflection and determine the minimum ground clearance.
 

25mm LATERAL DEFLECTION:   6 MM CABLE TENSIONED TO 1300 KG

Securing the cable:

After tensioning the cable, it must be secured to limit backward movement.  The following securing method is recommended:

Vine line grips / Guy grips

The securing method is explained in the installation procedure .