Typiod:
broadgage not very easy to work on the cable live though is it.
Yes it is, after proper training.
The usual procedure is to cut about half of the armouring wires, and bend them away out of the work area, joint these temporarily with a suitable jumper cable. Repeat with the second half. NEVER cut or disconnect all the armouring wires at the same time. They may be carrying current.
After jointing the four cores, a metal conductor is used to ensure earthed armour continuity.
Encase the joint in a lead sleeve and make a plumbed joint between this and the lead covering of the cables. Fill the lead sleeve with molten bitumen.
For added protection, a stout earthenware housing may be affixed outside the lead sleeve. Fill with more molten bitumen.
broadgage:
Here is a radical idea. What about use of 4 core cables with a black neutral core, and red, yellow, and blue cores for the three phases. covered with PVC or similar insulating materials.
Provide an outer sheathing of galvanised steel wires. This would serve three purposes. Firstly the robust wires would protect the insulated cores from damage. Secondly the steel wires would provide a metallic earth path back to the transformer. And finally, these metal wires would be in contact with the general mass of earth, thereby providing a very low resistance to earth.
Radical - they shoulda done it years ago and far superior to this brown, black , grey with a blue N fiasco. We have become a thirld world nation
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