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If they'd have taped them up with the correct stuff they'd have lasted for years .

You want to get technical about it they make tri plex up to 35KV rated .It isn't used much .I've installed short runs that carried 4160 though .

What,tri plex ? I'm not going to argue about but look it up . Here ya go http://www.nexans.us/eservice/US-en_US/navigateproduct_540149578/Triplex_Service_Drop_600_V.html

Now you get into distrubution lines every so often you might see 4 conductors on a "star" type spreader .It's not used that often nor generally for miles and miles ,usual short runs of maybe a few miles .Those are and have to be insulated for the voltage at hand because the conductors are only...

The problem with buried aluminum tri plex or quadra plex is the fact that aluminum is known as a sacrifing metal .If you get just one little tiny pin hole in it buried in the ground over time it will kind of disolve through galvanic action . As far as terminoligy regarding conductors I can...

More . Last summer Tom's brother in law who is also in the tree biz had one of his idiots run the lower boom of a nearly new Altec into the primarys spanning two phases .It burned up the main lift cylinder ,all the hoses and I think even the hydraulic pump .Did like 40 thousand in damages...

For clarification on this "coating " term .The tri plex going from the transformer to the house it is indeed insulation ,cross link polyethlene . A real real old service might be three individual lines on insulaters .Older stuff with insulation not to be trusted . Some of the older promary...