Cable Pulling | Safe Pulling of Cables Using Motorised Pullers
Published 16 Jan 2020
Pulling with motorised assistance
In most cases the cable is pulled with motorised assistance. During this procedure, forces of tension result, which, depending on the type of LV MV HV cable to be pulled, can reach double kN figures. Particular attention must therefore be paid to work safety.
Trained staff and faultless equipment which is regularly checked and maintained should be a matter of course in order to guarantee safe operation. Damaged pulling ropes or bent hooks should be removed and replaced with safe ones.
Pulling of the cable should occur with constant monitoring of the connected tension gauge.
Suddenly increasing tension levels may indicate that the cable is obstructed or has become caught in the cable duct. Operators must reduce the speed of the cable winch or stop it in order to identify the cause.
While the cable is being pulled it must be ensured that the cable is running over the installed deflector rolls. Instances of cable damage occurring as a result of edges, corners or stones, or vehicles driving over the cable, are to be avoided at all costs.
The complete cable pulling process should be recorded in a protocol and any anomalies or irregularities should be noted. The tension measurements should also be added.
Once cable pulling is complete, the run should, where possible, be inspected again.
The cable end caps should once more be checked to ensure that they are securely fixed and watertight and should only be opened in preparation for a connection or the fitting of cable sleeves.
Cable Pulling Protocol for Low & High Voltage Cables
The protocol of tension measurements, which contains readings of the tension that occurred during pulling in, is essential to demonstrate that pulling in has been carried out correctly. If such a protocol can not be provided or if too high tension has occurred, the cable manufacturer will indicate incorrect laying and suspend the guarantee for any resultant damage.
In all cases the laying instructions of the customer and the cable manufacturer are to be observed, especially the data referring to bending radius and tensile strength.
Where there is sufficient space it is possible to use underground cable caterpillar tracks, which support the pulling of the cable by pushing it along with a motorised caterpillar track system. Versions with electric motor, hydraulic drive or internal combustion engine allow the use of an underground cable caterpillar track irrespective of location.
When pulling outdoor cables in cable pipe with narrow cross sections the use of cable lubricating grease should be considered. Static friction between the cable sheath and the pipe walls is minimised by the grease, which makes it easier to pull the cable into the pipe.
- Cable Laying | The Importance of Cable Installation Instructions
- Cable Drums | Recommended Transport & Storage
- How to Prepare Cables To Avoid Cable Damages & Faults
- Cable Pulling | Safe Pulling of Cables Using Manual Laying
- Installation of Cable Sleeves | Jointing & Splicing Cables
- Installation of Rail Foot Cables
Cable Pulling Equipment
Thorne & Derrick distribute an extensive range of Cable Pulling & Laying Equipment to enable the safe installation of fibre and copper cables within the telecommunications industry. Safely installed cables reduces operational and maintenance requirements to the network and reduced service interruption to telecom cables, wires, ducts, cabinets and exchanges – products include cable spiking tools, conduit rods, cable lubricant, cable socks and rollers.