Re: vttc

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jim Lux" <jimlux-at-earthlink-dot-net> 

In fact, when I was turning some 4" diameter white PVC on a lathe one day
(to clean it up and get a nice smooth surface, as well as cut some grooves),
I discovered that the white was only a thin surface layer, and that there
was grey and black underneath it.

Waterpipe PVC is only spec'd for carrying water, so it's free of toxic
contaminants and can handle the rated pressure.

As Dan points out, the grey stuff for electrical conduit doesn't have to
handle any pressure, but it does have to have a fairly well defined
dielectric strength.

 > Original poster: dhmccauley-at-spacecatlighting-dot-com
 >
 > Thats a very good question actually.
 >
 > The fact that the PVC is grey would make many of us think it may contain
 > carbon have a poorer dielectric strength than white PVC.  However, in
 > reality, the grey PVC you frequently
 > see in electrical conduit, also known as Type I PVC, has a much higher
 > dielectric strength than the typical white PVC we encounter.
 > So, to answer your question, grey PVC is not only good to wrap your
primary
 > around, its better than the white or green PVC most of us use.