RE: Ground, etc. (Re: A few Q's)

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

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jim-at-jlproduction-dot-com>

DWP Replied-
I'd not expect (nor did i mention) harm.  Just useful to
know that cement is a fairish conductor.  I' would suspect
most of the current that makes it tot he 'cylinder head'
(or whatever) will run right into the concrete.

Surely you don’t mean it will not continue down the line to the ground
rod?
I assumed you mean if I left it there w/o and other ground it would pass
into the floor correct?
Again, the head is just a junction point there is a line out from it to
the pole in the ground.
I will insulate it from the floor regardless.

Another this I see is the avoidance of screws of any type securing the
secondary down to it's form. I made two "L" brackets out of plexi,
gooped one side to the side of the end cap on the secondary, and screwed
the other side down to the plywood base. This way I can remove the
screws and pull the secondary out to move the whole unit if I have to.
Surely these two small sheet metal screws attached to wood won't pose a
problem will they?

Thanks,
Jim




-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com] 
Sent: Thursday, March 14, 2002 9:50 AM
To: tesla-at-pupman-dot-com
Subject: Re: Ground, etc. (Re: A few Q's)

Original poster: "davep by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<davep-at-quik-dot-com>

Tesla list wrote:
> 
> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<jim-at-jlproduction-dot-com>
 
> Hi all
> DWP I am left a little confused by your comments. Are you saying that
> the cement will conduct enough to cause harm or that it is ok just
> laying there?

	I'd not expect (nor did i mention) harm.  Just useful to
	know that cement is a fairish conductor.  I' would suspect
	most of the current that makes it tot he 'cylinder head'
	(or whatever) will run right into the concrete. 

> Also of note is that I too have seriously debated the Variac's ground
> point.

> I think that maybe after all I should just use the mains ground and
> leave the other item(s) for the RF ground.
 
	My snap opinion is that the variac case should be connected to
	power line ground.

	I Would Appreciate Suggestions from Others...

> The secondary part I pretty much had decided to do something with
> anyway so I will secure that somehow.

> Thanks for anyone who can set me straight on this. I really want to
make
> sure that I (nor anyone else) gets hurt.
 
> Jim L
 
> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: Wednesday, March 13, 2002 6:11 PM
> To: tesla-at-pupman-dot-com
> Subject: Ground, etc. (Re: A few Q's)
> 
> Original poster: "davep by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <davep-at-quik-dot-com>
> 
> Tesla list wrote:

> > Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> ><jim-at-jlproduction-dot-com>

> > Hi,
> > I am using a ground rod in the yard.

> > What I am doing with the cyl head is using it as a junction box
>>per se.  The leads coming off the secondary, safety gap, NST and
>>Variac I wanted to keep short to I connected them all to the cyl
>>head laying on the floor a few feet away. Then I will bolt one
>>long lead from the cyl head, out to the yard where it will attach
>>to the ground rod.
 
>         I believe some would argue for tying the variac to the power
>         line ground.
 
> > I glass beaded (like mild sandblasting) the entire head to it is
> > scale/oxidation free but it is dull in appearance.
 
>         Al, in air, is NEVER oxidation free.  It oxidizes
>         Immediately.  (The oxide is clear, so it may look
>         shiny, and 'clean'.  The Oxide is fragile enough
>         so that tightening a screw, etc will disrupt it.
>         THAT gets a metal to metal joint, which, if tight,
>         excludes the oxygen.  (typically, toughing with
>         an ohmmeter probe will break the oxide: which appears to
>         conduct...)
 
> > Is this set up ok? Should I put the head on a piece of wood or
> > plexi so it is not right on the same floor that I am standing
> > perhaps? It is a cement floor and not dirt or wood
 
>         Cement, in a mass (as here?) is a pretty good conductor.
>         I expect current is flowing thru the cement...
 
> > so I figured I would be ok.

> > One other thing I wanted to ask. My secondary is just sitting there
in
> > the middle of my primary. Does this need to be attached somehow so
it
> > wont tip over or is just standing up ok? It does not seem to "tippy"
>> but I didn't know if during operation it could get knocked over
somehow.
 
>         I'd figure a way to secure it.  Any little thing (air
currents,
>         etc) could tip it...
 
>         best
>         dwp

	best
	dwp