How feasible would it be to construct such a torroid? Or modify one
already existing. In the project that Tony posted, they seem to have
used a snap on choke. This seems to be a nice arrangement as it's
already split in two and can be snapped around the wire. However, 4/0
cable is rather thick (0.46inch), and I don't know about finding a snap
on choke that large. I'd like to keep costs down, but if need be I guess
I can try the radio shack cheapie and steal the clamp off of it. I guess
I'll have to hope that what limits the device to 30A right now is the
display. I wonder how hard it would be to crack it open.

Thanks,

Josh
--
A common mistake that people make when trying to design something
completely foolproof is to underestimate the ingenuity of complete
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Olin Lathrop wrote:
> The torroid provides a "low resistance" path form the magnetic flux, thereby
> concentrating it into a known geometry.  You now have a circular magnetic
> field proportional to the current in the wire under test.  Changes in this
> magnetic field can be sensed by any loop of wire inclosing the magnetic
> flux.  This effect is often weak for our purposes, so many loops of wire
> (the coil) are used to increase the strength of this signal.
>

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