Re: [TCML] Idle musings about surge suppressors

[DC Cox <resonance@xxxxxxxxxxxx>]

Great point Steve.

this is why proper design requires any device such as a MOV or fuse to be
enclosed in a metal enclosure --- like a commercial NEMA box or equivalent.

Dr. Resonance




On Mon, Mar 15, 2010 at 11:44 AM, Steve Ward <steve.ward@xxxxxxxxx> wrote:

> It might be worth considering what happens to these things when they DO
> have
> to clamp a surge.  Is your construction material going to catch fire from
> the heat generated by the MOV?
>
> Steve
>
> On Mon, Mar 15, 2010 at 12:26 PM, Reverend Fuzzy
> <cmayeux@xxxxxxxxxxxxxxxxx>wrote:
>
> > Most of them are just that... MOV's  When I found that out, I built my
> own
> > with 3 heavy-duty MOV's on a piece of perfboard, then
> > covered the whole board in a chunk of heat-shrink tubing... wound up with
> a
> > module as big around as a small matchbox, with one red,
> > one black, and one green wire coming out of the end... total cost, under
> > $10.
> > (black to phase A, red to phase B, green to neutral/ground bus bar.)
> >
> > > -----Original Message-----
> > > I wonder if maybe they were referring to the whole-house units which
> > simply plug into your load center
> > > to allegedly protect everything from spikes.  They use 2 slots, 1 for
> > each pole of the 240VAC.  I have
> > > installed a 100amp sub panel in my garage and was considering putting
> one
> > in there as that is where I
> > > will power most of my experiments from, and the prices have dropped to
> > only around 60 bucks from $100.
> > > Has anyone taken one of these units apart to see what's inside?  If
> it's
> > just MOVs then I won't waste
> > > my moola on one.
> >
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