Re: Help With a MOV (Varistor?)
- From: w_tom <w_tom1@xxxxxxxxxxx>
- Date: Fri, 27 May 2005 00:48:21 -0400
First, to be properly sized, the power strip should contain
about 3000 joules. Notice how few joules were inside that
ineffective power strip.
Second, safety issues must be considered. Better is to
replace that MOV with TMOVs from littelfuse.com (or something
equivalent). This simplifies safety considerations.
Third, if the protector is intended to detect destructive
transients, then it should be plugged into a receptacle on
breaker box - with 6' power cord shortened as much as
possible. To have a grossly undersized protector detect
destructive transients, the protector attached to breaker box
receptacle makes short connection from AC wire to earth
ground. Furthermore, tranzorbs may perform detection better.
Use a smallest wattage tranzorb or transil or equivalent.
Fourth, protection from direct strike is performed routinely
in just about every town every year. That is what a protector
is for. To earth a direct lightning strike AND remain
functional. Ineffective protectors install too few joules.
It encourages myths and promotes more sales. Notice so few
joules inside ineffective protectors.
Tim wrote:
> Well, I believe that the MOV are a good way to see is surges are
> present. They will prove that the power line is at fault, and in
> my case that is important, as I have been saying that to the site
> owners where I connect the equipment. I realize that the MOV won't
> give great protection for the equipment, but I like 'em to be in
> there anyways.
>
> Thanks, for the nfo tho, I will check Radio Crap next time by, may
> be cheaper than paying shipping from Digikey.
.
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