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> No, I mean the stuff that runs down your street and branches to every
> house.
Ah ok, yes that would need to be insulated! I don't think we have cables
like that anywhere here (or if we do it's really uncommon), it's all
underground apart from the high voltage long distance stuff. I remember
when I visited Japan they had crazy amounts of cable in the air, with
transformers at the top of poles etc, I'd never seen anything like it:
http://img1.photographersdirect.com/img/11943/wm/pd540134.jpg
I guess once you start putting power and telephone above-ground, things get
very messy very quickly in heavily populated areas. Underground I suspect
you have the same, it's just hidden from sight!
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