Re: [AGA-Member] undergravel heaters -- or - uncovering the costsandbenefits

["Troy Hendrickson" <t_hendrickson@qwest.net>]

Hee Hee

Actually it's an electrical testing lab where I work, as the story goes,
this became a subject of debate before I worked there, and they supposedly
put a goldfish in a sleeve testing tank, a stainless steel tank which is
energized at 7,200VAC and the fish lived. The steel tank is hot, the path to
ground are probes that reach into the water filled sleeve, the test measures
the dielectric properties (current leakage) of the sleeve.

Considering some of the rather juvenile behavior I've seen there, I have no
problems believing they did such a thing, don't know about the fish living.

A human of course would be truned into plasma, humans are grounded by the
earth they walk on. The only way (in theory) a fish could get zapped is by
touching a probe and completeing the path to ground.

The DNR here uses DC to stun fish for counts, it works because the fish are
caught between the negative and positive electrodes, with AC since the fish
isn't completing a path to ground just floating in the water, no zap. Any
further explanation would be in the engineers domain and that's where i see
their lips move, but all I hear are seagulls.




----- Original Message ----- 
From: "S. Hieber" <shieber@yahoo.com>
To: "Aquatic Gardeners Association Member Chat" <aga-member@thekrib.com>
Sent: Monday, March 07, 2005 11:29 AM
Subject: Re: [AGA-Member] undergravel heaters -- or - uncovering the
costsandbenefits


> But just to be sure, see if you can't get him to drop his
> hand into a bowl of water without his catching on. With
> appropriate electrical hookups. ;-)
>
> sh
> --- Troy Hendrickson <t_hendrickson@qwest.net> wrote:
> > A DC system also has the potential to stun your fish
> > under the right
> > circumstances. AC as rule will not because fish aren't
> > grounded, where as
> > with DC, they can get caught in the field between the
> > positve and negative.
> >
> > At least that how the EE at works likes to tell it, and
> > since he has
> > substantially more paper on his wall than I do, at the
> > very least it isn't
> > worth arguing with him about it.
> >
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