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DNO Isolation of supply cable.
Former Community Member
After watching a YouTube video in which the DNO was moving the customers service head and they had to join the new cable to the old lead sheathed supply cable, I was wondering how the DNO isolates the old lead sheathed supply cable so they can connect the new cable to it?
Unless there are complicating factors, most types of LV cables can be live jointed if access is good and conditions are clean and dry.
As well as the PPE, there are special tools, including shaped insulating wedges to drive between the cores before you hacksaw into them, so that the saw does not short out adjacent cores. Neutrals/ earths are linked to new before cutting any of the old armour, to avoid an open circuit neutral at all costs, and then lives are done joined last. Whatever is not being worked on is covered in temporary insulation.
Unless there are complicating factors, most types of LV cables can be live jointed if access is good and conditions are clean and dry.
As well as the PPE, there are special tools, including shaped insulating wedges to drive between the cores before you hacksaw into them, so that the saw does not short out adjacent cores. Neutrals/ earths are linked to new before cutting any of the old armour, to avoid an open circuit neutral at all costs, and then lives are done joined last. Whatever is not being worked on is covered in temporary insulation.
