15 kV/m is an electric field of 15,000 volts per meter. If you are outside
in a strong thunderstorm, the electric field due to charges in the cloud can
get as high as 15 kV/m or even higher. If the field is this high, lightning
may be imminent. If you have a Tesla coil generating 500,000 volts, the
field in its immediate vicinity could be 250,000 V/m. Walking across a
carpet on a winter day can generate fields in the vicinity of 1 kV/m or
1,000 V/m.
---Carl
-----Original Message-----
From: Jim
Sent: Monday, April 21, 2014 3:31 AM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Tesla coil threat to pacemakers
Please define 15kv/m ?
On 4/20/2014 10:22 PM, Carl wrote:
15 V/m and 3 V/m are tiny electric fields. Walk outside and you are
in about 100 V/m due to the charge on the ionosphere. Are you sure
you haven't dropped a k? Even 15 kV/m at that distance seems low.
---Carl
-----Original Message----- From: Adam Munich
Sent: Sunday, April 20, 2014 6:17 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Tesla coil threat to pacemakers
Bturner,
For what it's worth, I have measured e-field strengths of up to 15V/m
about 2 meters from my DRSSTC. I would advise caution.
Regards,
-Adam
On Sun, Apr 20, 2014 at 8:31 PM, Jim <electrical@xxxxxxxxxxxx> wrote:
I worry about my classic coil all of the time. A friend recommends
putting
the static spark gap only in a faraday cage (like metal screening). He
believes the spark gap is the only culprit.
On 4/20/2014 3:02 PM, Kuba Anglin wrote:
Hey,
I recently finished my first Tesla coil and am very impressed by its
performance. After a couple minutes of tuning, I was looking at 3-4
foot
streamers. There have been no problems with the coil so far except
for the
over-coupling issue, which I solved.
The Tesla coil is now no secret to my immediate or extended family,
and I
have many requests for demonstrations. Especially from my
grandmother who
is very impressed with me and my brother's work (I worked on this
project
with my twin brother). However, she has a pacemaker, and I have
explained
to her that the inductance field produced by the Tesla coil will damage
any
nearby electronics including pacemakers. I did some reading and for my
Tesla coil, 20 feet is a safe distance. Interestingly, I had my
phone in
my
pocket (samsung s4) during my first few runs and it works perfectly
even
though it had been within fluorescent tube igniting range for at
least 20
seconds.
Before I built my Tesla coil, I had nearly 4 months of research
behind me.
I made sure I had a very good understanding of every component and
its use
before I bought one piece. I have never taken a physics class as I am
currently a 16 year old high school sophomore taking AP chemistry,
but I
feel as though I may not need to at this point (don't worry, I will
take
physics next year and AP physics the year after as I have heard that
the
curricula are different). That said, I have done extensive research
on all
aspects of how and why a Tesla coil works.
The only problem is that anyone who sees the Tesla coil makes
assumptions.
The ignorance I have experienced from others has become infuriating.
This
is why I would finally like to settle this.
*What is a safe distance to stand from my Tesla coil if the person in
subject has a pacemaker?* Please include your education and/or
experience.
Any other unrelated comment or questions are also welcome. I have all
information regarding my Tesla coil below:
*Video:*
https://www.youtube.com/watch?v=Y1jNe0FIZ8g&feature=youtu.be
*Image:*
http://s30.postimg.org/9d1txzls1/Tesla_Pic.jpg
*Parts:*
12KV 60mA Transformer (input 120V 60Hz)
28 (14X2) .15uF 2KV Capacitors
28 Resistors
Tungsten Spark Gap
Brass Safety Gap
1/4" 11 Turns Copper Primary
1/2" Strike Rail
4" PVC Pipe 2' Secondary 26 AWG Magnet Wire 1200 Turns
13"X4" Aluminum Spun Toroid
Thank You,
Kuba Anglin
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