[RE-wrenches] SOVs (was: Surge protector update?)

[Kurt Albershardt]

On 8/1/09 4:49 , Richard L Ratico wrote:
> 2)At a different training, by a well respected professional engineer who
> frequently posts here, they were judged to likely be as effective in preventing
> damage as a voodoo doll.
>    

I'm not disputing this, but would like to know more.  Perhaps our PE 
will elaborate.


> 4) Why aren't they UL listed?
>    

According to Delta, it's because they don't fail on normal surges and 
that is required as part of UL 1449.  
http://www.leainternational.com/UL1449.aspx mentions it starting in 2007:

/Now, when UL tests a SPD, they will apply a fault current of 100A, 500A 
and 1000A for permanently connected SPDs and 50A and 150A for plug-in 
and cord connected SPDs. These currents are applied using line to line 
voltage in the line to neutral mode. During this testing, the SPD must 
fail in a safe manner to be UL 1449 listed.
/

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