Re: pole pig question (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: List moderator <mod1@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Mon, 21 May 2007 00:42:09 +0000
From: drieben@xxxxxxxxxxx
To: Tesla list <tesla@xxxxxxxxxx>
Cc: drieben@xxxxxxxxxxx
Subject: Re: pole pig question (fwd)

Hi Jim,

I'm not quite sure what you mean by your question?
A typical single phase pole transformer has either one
or two of the "horns" or "rabbit ears" that protrude 
from the top lid of the tank and these are where the 
high voltage is tapped from the overhead primary line(s).
If it has two horns, then the internal primary high voltage
winding is normally completely isolated from the outer tank 
shell. If it has a single horn, then the high voltage primary 
winding has one end grounded to the outer metal tank
shell. 

There are ususally three low voltage secondary output
bushings on the upper part of the side of the tank shell.
If its output is 240 volts, then there will be 240 volts be-
tween the two outer secondary bushings and 120 volts
between each of the outer secondary bushings and the
center bushing, which is normally grounded to the side
of the tank shell via a copper grounding strap. Coilers 
usually remove this ground strap if they are going to run 
the pig on a ballasted 240 volt input and hook the bal-
lasted 240 volts to the outer two secondary bushings,
leaving the center one unhooked.

Hope this cleared things up a bit for you.


David Rieben

-------------- Original message -------------- 
From: "Tesla list" <tesla@xxxxxxxxxx> 

> Original poster: List moderator 
> 
> 
> 
> ---------- Forwarded message ---------- 
> Date: Sun, 20 May 2007 15:39:09 -0500 
> From: Jim 
> To: Tesla list , tesla-request@xxxxxxxxxx 
> Subject: pole pig question 
> 
> Hi Folks: 
> Could someone please explain to me why 240volt residential pole pigs 
> have only 1 - primary conductor and 2 - secondary conductors? 
> Thank You, 
> Jim 
> 
> 
>