Cable spiking tool

Cable maintenance personnel must positively ensure an underground electric power cable is de-energized prior to cutting. Responsible electric power system operating and maintenance procedures stipulate that prior to cutting underground or buried electric power cable, it should be spiked to ensure it is de-energized. SPIKE pushes a 2" spike into a single conductor cable to help line and cable personnel verify that it is de-energized prior to cutting.

SPIKE Tool is designed to be operated remotely at a distance of approximately 35 feet to prevent potential injury to personnel. SPIKE pierces a cables neutral or sheath and its insulation through to the main conductor. By breaking down the cable insulation, an arcing fault is created if the cable is energized prior to cutting.

If the cable is de-energized, there will be no fault. Care must be taken to select the correct cartridge for the type of cable to be spiked. After use cable spiking equipment should be checked, cleaned and oiled and there must be a procedure to ensure this is carried out and recorded. There may be occasions where it is required to undertake repair, jointing and termination work on one or two of the single core cables — it would therefore be undesirable to cable spike and damage all three.

If only one or two of the single core cables are to be spiked, then insulation tests before and after spiking should be conducted, to confirm that the correct circuit has been spiked. It would necessary to use an instrument that applies a sufficiently high voltage to detect the damaged cable caused by the spiking. This is necessary, as the single core cables may be completely severed by the spike and may appear as an open circuit and therefore healthy , if the voltage applied by the instrument is too low.

An incorrectly spiked high voltage cable, belonging to another party such as an IDNO Independent Distribution Network Operator could be re-energised by that party, following its initial cable spiking and consequential circuit tripping.

This would result in serious danger — it is therefore essential to obtain positive verification by an approved methodwhen identifying a cable by signal injection. Incorrect Spiking Of An Live Low Voltage Cable — the spiking tool and process may not produce any observable signs such as sparks, flames or smoke that the cable is live. It should be appreciated that after the spiking of any cable then the cable could still be live on one or more phases which could also make the spiking gun live.

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