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11 KV cables.

broadgage
Until fairly recently, underground 11 KV cables were invariably 3 core, paper insulated, lead covered, with an earthed steel wire armouring. Then came the more modern plastic insulated cables, with earthed armour and a red plastic over sheath to distinguish them from LV cables.


However the modern trend seems to be a bundle a 3 single core cables, each with an aluminium core, plastic insulation, copper wire armouring and a red plastic sheath.

Why is this used ? It seems to me that 3 single core cables would be more costly to manufacture, and more labour intensive to joint or terminate, than one 3 core cable.

I fail to see the advantage, but presume that there must be some advantage, or why make the change ?
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    In a new British Aluminium smelter in Invergordon, I was an Electrical Engineer for a time. The 4 cell rooms were about 1200m long and because of the VD, had a 415V supply at each end for the busbars to the the overhead crane supplies, fed from 1 of a few ring circuits. The completion of the project required that the final connections of the "ring" were only made to the "crane hospital" bays during the commissioning.stage by a BACO electrician. He connected the phase colours wrongly with the resultant trippimg. I found out then that this chap was colour blind! and could distinguish shades only. He had stated this on his application form for employment but was still recruited.


    I could only keep him in employment, if he agreed to have someone else write down the colours for him. How common is it for a colour blind electrician?, should they be in the trade? would it be seen as discrimination?


    Jaymack
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    In a new British Aluminium smelter in Invergordon, I was an Electrical Engineer for a time. The 4 cell rooms were about 1200m long and because of the VD, had a 415V supply at each end for the busbars to the the overhead crane supplies, fed from 1 of a few ring circuits. The completion of the project required that the final connections of the "ring" were only made to the "crane hospital" bays during the commissioning.stage by a BACO electrician. He connected the phase colours wrongly with the resultant trippimg. I found out then that this chap was colour blind! and could distinguish shades only. He had stated this on his application form for employment but was still recruited.


    I could only keep him in employment, if he agreed to have someone else write down the colours for him. How common is it for a colour blind electrician?, should they be in the trade? would it be seen as discrimination?


    Jaymack
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