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Re: [TCML] top load and photography (tripod grounding)
In a message dated 3/4/08 9:02:50 P.M. Eastern Standard Time,
>Actually Peter, the tingle was probably due to "you" at a high potential
>and not the camera.
But it's implied that after Peter grounded the tripod, the "tingle" went
away. This would mean that the camera was originally not at ground
potential, but Peter's body was.
>I understand keeping the body at the same potential >as the camera.
>This is perfectly acceptable and understood. But, the grounding of either
>you or the camera is simply something I personally would not do.
The same theory that "standard" safety grounding is based on applies
here as well. If a conductive object is in contact with your body, if it's
grounded then the current should take the path of the grounding conductor instead
of your body.
> I also won't run a coil bare foot for similar reasons.
I don't think being in bare feet would make much difference WRT strikes from
the topload. But it might save your life if you get in contact with anything
on the primary side (or the line side!). Besides, you might step on
something painful which causes you to jump or fall into live equipment.
Who does this stuff in bare feet, anyhow?
>As you say, if a camera strike occurred to the camera or tripod itself,
>yes, most likely you would be protected. However, if you are touching
>the camera "you" become grounded. The strike might hit you instead of
>the camera. Well, the strike will travel through you to get to tripod.
That's a valid point, but I bet even if the tripod wasn't intentionally
grounded you'd still be in bad shape if you took that strike. I don't think a
ground wire to the camera would make much difference.
If I was out in the middle of a field holding a lightning rod, I'd
really prefer to have the lightning rod solidly grounded, not free floating in my
hands. Almost a moot point? Better to stay out of a bad situation!
FWIW, I remember when I was running my 4" coil in the garage, and the
thing reached out with a 4' strike to a big polyethylene trash barrel. One
strike only! Apparently it was attracted to the static surface charge on the
barrel. Once it "sucked all the charge" off the barrel with a hot strike, it
never tried to hit it again. So even if you're conscientiously wearing
well-insulated footwear and staying away from grounded objects, you might still make a
highly attractive target to a strike.
Center for the Advanced Study of Ballistic Improbabilities
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