Surge / Ground / Lightning
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From: fl_fly_boy on 7 May 2008 14:17 > I think the UL requires only that the MOVs don't start a fire when > exposed to conditions which cause their break-down. They don't rate > their ability to function as "surge protectors". UL evaluates surge suppressors for fire, electric shock and personal injury hazards, and also measures and categorizes the devices for how much voltage they can "clamp," thus preventing excess voltage from passing through to electronic equipment. UL refers to this as a "suppressed voltage rating," with ranges from 330V (volts) to 4000V. Believe it or not, the lower the rating, the better the protection. Whatever surge suppression protection you're looking for, make sure the surge suppressor has been tested and Listed to the stringent requirements of UL 1449, the Standard for Transient Voltage Surge Suppressors. http://www.ul.com/consumers/surge.html http://ulstandardsinfonet.ul.com/tocs/tocs.asp?doc=s&fn=1449.toc
From: VWWall on 7 May 2008 14:37 fl_fly_boy(a)yahoo.com wrote: >> I think the UL requires only that the MOVs don't start a fire when >> exposed to conditions which cause their break-down. They don't rate >> their ability to function as "surge protectors". > > > UL evaluates surge suppressors for fire, electric shock and personal > injury hazards, and also measures and categorizes the devices for how > much voltage they can "clamp," thus preventing excess voltage from > passing through to electronic equipment. UL refers to this as a > "suppressed voltage rating," with ranges from 330V (volts) to 4000V. > Believe it or not, the lower the rating, the better the protection. How can one find this rating for a particular device? > Whatever surge suppression protection you're looking for, make sure > the surge suppressor has been tested and Listed to the stringent > requirements of UL 1449, the Standard for Transient Voltage Surge > Suppressors. > > 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. > http://ulstandardsinfonet.ul.com/tocs/tocs.asp?doc=s&fn=1449.toc Thanks for the reference. -- Virg Wall, P.E.
From: VWWall on 7 May 2008 14:50 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.
From: Tantalust on 7 May 2008 15:05
"w_tom" <w_tom1(a)usa.net> wrote in message news:b224d456-f25c-4c73-bfe5-c546c7871592(a)e53g2000hsa.googlegroups.com... > On May 6, 2:45 pm, Sjouke Burry <burrynulnulf...(a)ppllaanneett.nnlll> > wrote: >> Can you trim W_tom with that?? Or is he incurable? > > He is incurable as long as others post outright lies and myths while > denying what really provides surge protection. Now to discuss what is > relevant. What's becoming more relevant here every day is your mental illness. . . . . along with your terrible OCD disadvantage, constantly referring to yourself in the third-person is pointing to a flourishing Depersonalization/Dissociative Identity Disorder. You can look it up. |