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RE: [TCML] Idle musings about surge suppressors
That would be one of my main concerns. I think closed in a proper box, the fire issue is small (albeit still cause for concern), but a closed short could be problematic. It would be interesting to look inside one of the GE whole-house units to see how they are constructed.
Nick A
> Date: Mon, 15 Mar 2010 18:17:04 -0400
> From: Dave@xxxxxxxxxxxxxxxx
> To: tesla@xxxxxxxxxx
> Subject: Re: [TCML] Idle musings about surge suppressors
>
> Nick,
>
> Be aware that MOVs often fail shorted. Be sure to put them on the
> outboard side of a big breaker. The breaker won't trip fast enough to
> limit the surge suppression capability of the MOV, but it will prevent a
> big problem if a MOV fails in shorted mode. I've had this happen on my
> own house.
>
> Dave
>
> On 3/15/2010 2:44 PM, Steve Ward 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.)
> >
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