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Posted to alt.comp.hardware.pc-homebuilt,alt.home.repair,alt.engineering.electrical,alt.tv.tech.hdtv,sci.electronics.basics
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Surge / Ground / Lightning
VWWall wrote:
see original post
http://www.ul.com/consumers/surge.html
"The unpredictable nature of surges makes it difficult to suppress them;
you never know when, how long or how powerful they will be. In some
cases, a surge may have a higher energy level than the device can
handle. When this happens, the surge suppressor may be damaged and lose
its ability to provide protection against future surges."
I'm happy to see that UL agrees! They don't seem to put any evaluation
of this parameter, unless the "suppressed voltage rating" includes the
Jules rating of the MOVs.
This should read "Joules". See:
http://en.wikipedia.org/wiki/Varistor
for some useful information.
--
Virg Wall, P.E.
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