RE: NON-static shocks from unpowered secondary?

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

Original poster: "David Kyle by way of Terry Fritz <twftesla-at-qwest-dot-net>" <dave-at-kyleusa-dot-com>

Well my shoes were fairly sensible but I would not classify them as
shock proof. I seriously doubt that I had accumulated a charge as only
moments before I had my hand on the grounded Variac case. I suspect as
others have suggested the charge must accumulate on the form or coil
coating. My coil is coated with very thick polyurethane.

Next time I run it I will try a few unpowered experiments to see if I
can learn any more about it. The shock really startled me since it was
totally unexpected. I am very lucky I did not cause the toroid to fall.

Dave

=========================================
Dave Kyle
Austin, TX USA
Email: dave-at-kyleusa-dot-com


-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com] 
Sent: Tuesday, February 19, 2002 1:34 PM
To: tesla-at-pupman-dot-com
Subject: RE: NON-static shocks from unpowered secondary?

Original poster: "Malcolm Watts by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>

Hi David,

On 19 Feb 2002, at 8:09, Tesla list wrote:

> Original poster: "David Kyle by way of Terry Fritz
<twftesla-at-qwest-dot-net>"
<dave-at-kyleusa-dot-com>
> 
> I drew a quarter inch static spark off the toroid after the coil hand
> been powered down for several minutes (all AC connections severed). It
> really surprised me as the base of the secondary was still connected
> very solidly to earth ground so I had assumed and residual charge with
> have drained away. I now routinely discharge the toroid prior to
> touching it.
> 
> =========================================
> Dave Kyle
> Austin, TX USA
> Email: dave-at-kyleusa-dot-com

If the coil was grounded, then the charge must have been residing on 
you mustn't it? Were you properly grounded prior to touching the 
terminal or were you wearing sensible footwear?

Regards,
Malcolm