RE: Garage door opener protection

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

Original poster: "Ross Overstreet by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ross-o-at-mindspring-dot-com>

Hi Steve,
I simply disconnect all wires going to the opener and poke the wire antenna
back inside the case.  I don't ground the case of the opener or anything.
I've ran the tube coil at 5KW right up under the opener with 28" arcs coming
just inches from the case.  Today managed to strike it several times with my
NST coil that is doing 5+ ft arcs.  It worked when I hooked everything back
up.  It's a Sears model with metal box and plastic back.  I'm guessing the
metal box is a decent enough Faraday shield to "save" it.  YMMV.
Seeya,
Ross-0
http://users.better-dot-org/roverstreet/

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Sunday, June 10, 2001 8:19 PM
To: tesla-at-pupman-dot-com
Subject: Garage door opener protection


Original poster: "Steve White by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<slwhite-at-zeus.ia-dot-net>

I am in the process of buiding a pole transformer powered coil theoretically
capable of 8 foot arcs. I would like to run this coil at perhaps partial
power
in my garage at times. Like many people, I have a garage door opener. Is
there
any advice on how to protect the opener from damage? The only idea that I
have
is to build a grounded Faraday cage around it and unplug its power cord. The
Faraday cage will take care of the electric field but what about the
magnetic
field?