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![]() Phil Kane wrote: On Wed, 09 Jul 2003 03:02:43 GMT, Jim Hampton wrote: Phil, I doubt you're kidding, but a single wire with a ground return? That is going to have a ton of problems even *without* putting broadband on it. That amazed me too - but there's only one insulator on the pole pig and one wire crossing the street to same. Three phase primary is three wire, so there isn't even a Wye Neutral for return. I first saw this system along the Trans-Canada highway in Alberta in 1970 and I put it down to the rural-ness of the area. But suburban Portland in the 21st Century? Isn't that putting a lot of faith in the quality of the ground? I still remember years ago when I serviced a repeater out in the national forest that appeared to be working normally until some remote user keyed it up while I had my VM probes in the AC socket- the primary voltage suddenly dropped from 118 to about 50 volts. It was instantly obvious what was wrong- the neutral return was open and the keydown load on the AC now found the series resistance of the ground return-actually earth now- was such that it dropped the primary voltage that much. And the pole pig was only a few feet away. I gotta wonder how in the world a utilitly could reliably use earth for a return when they have no idea what load the consumer will place on it. I've never seen earth with resistance as low as copper! :^) Dick |
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