RE: Grounding Question

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

Original poster: "John H. Couture" <couturejh-at-mgte-dot-com> 


Adam -

There are still some changes you should make.

Coil 13 -

The transformer enclosure will have a ground lug that should be connected to
ground. Some transformers will have a separate terminal for the shield
between the windings as you show but this is not considered the enclosure
ground point.

There should be a short connection between point 10 and 11 and RF ground.
Keep in mind that this is part of the secondary circuit and connects two
plates of a capacitor together, topload and ground and should be as short as
possible.

Coil 14 -

Again the transformer enclosure will have a ground lug that should be
connected to ground. If there is no enclosure the frame should be grounded.

Coil 15 -

This is definitely a NEC violation because the transformer  enclosure or
frame is not connected to the electric service ground. A separate ground
wire from the transformer to the service ground is mandatory. Use the Coil
14 diagram plus the enclosure ground.

Note that the above is not for NST's or other transformers that have the
secondary winding grounded at the center.

John Couture

-----------------------------



-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Sunday, November 02, 2003 12:07 AM
To: tesla-at-pupman-dot-com
Subject: Re: Grounding Question


Original poster: Yurtle Turtle <yurtle_t-at-yahoo-dot-com>

Thanks. Both you and John said the same thing which
would be:

http://www.hot-streamer-dot-com/adam/temp/coil3.jpg

Note the neutral isn't connected to the pig.

My next question is whether this scheme would work
with a 120 volt PT such as:

http://www.hot-streamer-dot-com/adam/temp/coil4.jpg

or should it simply be connected like:

http://www.hot-streamer-dot-com/adam/temp/coil5.jpg

This is the way I've been running it for a while. By
tying the primary to the secondary, I've completely
eliminated the racing sparks associated with too tight
coupling and way overpowering a relatively small
secondary.

thanks
Adam
  >
  > Adam,
  >
  > Yes that's pretty close to what I'm talking about
  > with the notable
  > exception that node 3 would also be connected to the
  > mains
  > ground, since almost all electrical receptacles are
  > 3-wire (and
  > sometimes 4-wire) in our standard, single phase,
  > 120/240 volts
  > that our houses are wired with.  And, as you show,
  > the mains
  > ground in no way alleviates the need for a much
  > closer RF ground
  > to the base of the primary and secondary coils (node
  > 9,10, &11).
  > It just seems to me that a "return" is required for
  > the 60 Hz HV
  > voltage that comes up to the sparks gap and from
  > there everything
  > is then apart of the heavy tank circuit currents.
  >
  > David R.
  >
  >