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Re: pole pig question (fwd)
Original poster: List moderator <mod1@xxxxxxxxxx>
---------- Forwarded message ----------
Date: Mon, 21 May 2007 12:20:27 -0700
From: Don Murray <don@xxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: pole pig question (fwd)
Primary neutrals and common neutrals are metallic returns to substation.
A primary neutral is not connected to the secondary. A primary neutral
is carried in the primary position on the pole(above transformer) and is
often a smaller conductor on smaller insulators. A common neutral is
connected to the primary and secondary. A common neutral is cared is the
secondary position (below transformer) on the pole. Around here common
neutrals are ground every 1000` under the main line and the end of every
lateral tap to a 3.5 ohm ground or less. Tested with a Vibrogound. A
secondary neutral is not always a common neutral. You donít have to have
a primary or common neutral and you can still have a secondary neutral
which is ground at the pole and the service entrance. Most utilities
have not used a wire staple to bottom of pole for a ground since the
70ís and your not supposed to put the ground rod in the pole hole ether
it should be in virgin ground.
Tesla list wrote:
> Original poster: List moderator <mod1@xxxxxxxxxx>
> ---------- Forwarded message ----------
> Date: Sun, 20 May 2007 20:02:57 -0400
> From: David Speck <dave@xxxxxxxxxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: pole pig question (fwd)
> Often, a typical pole pig has HV input to the primary terminal and an
> earth ground return connected to the case which runs down the pole.
> The output is 240 VAC center tapped, with the center tap connected to
> earth ground at your breaker panel.
> That innocuous looking wire that runs down the pole into the ground (it
> often ends in a spiral coil stapled to the bottom end of the utility
> pole) plays a critical function. A teenager around here was killed a
> few years ago when he scraped a utility pole with a lawn mower, breaking
> the down wire, and essentially running 14.4 KV into the mower deck.
>>Could someone please explain to me why 240volt residential pole pigs
>>have only 1 - primary conductor and 2 - secondary conductors?