Posted by John T on April 22, 2021 at 13:10:10 from (45.16.200.171):
In Reply to: Why metal poles? posted by Geo-TH,In on April 22, 2021 at 09:56:48:
Good Neighbor George, its been a while since I practiced power distribution engineering but they were coming in favor back then due to their strength, longevity, didn't rot, withstood wind and they don't have to chase tree huggers away to cut down the poles lol
Metal is a much better conductor then wood DUH If you look at many aerial HV service lines notice how the very bottom wire right below and relatively near the hot high voltage conductors is the earth grounded Neutral conductor. And in my day at every 4 poles we ran a bare No 4 copper wire unprotected down the side of the pole to driven ground rods...If a hot breaks loose it falls on the earth grounded Neutral below it (subject to time and current) can trip the breaker de energizing a dangerous line. If a hot breaks and falls on a pole if its conductive the breaker will (subject to time and current) trip, again hopefully de energizing the hot line and there's a better chance of that happening if the pole is conductive versus wood. And it may fall and not come in enough or long enough contact with the Neutral or a pole to throw a breaker AND STILL BE HOT WITH HV AND KILL YOU DEAD
Anyway NO GUARANTEE THINK WHATEVER YOU WISH, that's how HV Power Distribution experts, engineers, professors I had and companies explained it to me, but that's been a while, maybe things have changed since then ??????? NOOOOOOO WARRANTY MIND YOU Ive seen plenty of wood n plenty of metal poles and there must be a sound reason (including safety among others) why they are used even if little old me fails to understand it ....... It been too long since I was up on all this grrrrrr
I found they pretty well know what they are doing when it comes to high voltage and safety for the linemen and passer bys should a line break free and fall down. Better hope it falls on a good grounded conductor be it a metal pole or the Neutral immediately below long enough it so its de energized ???? A copper wire or a metal pole is less resistive and better conductor then the human body and it only takes like 0.030 to 0.050 amps to mess up your ticker OUCHHHHHHH.
Don't take my word for it however, consult high voltage distribution engineers to see the advantages or disadvantages and why they might choose wood versus metal and where and in what applications ??? Im too darn old n rusty to know for sure
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