UL listing of lightning arrestors [RE-wrenches]

[William Korthof]

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I know conventional wisdom holds that adding protection against lighting 
(and other faults) is always a good thing... lots of people seem ready 
to recommend lightning arrestors (and many other devices), but I've 
never encountered any technically sound substantiation for them.

So, I'm wondering... has anyone on this list done testing or developed 
some sort of substantiation (or come across such results) to justify the 
use of lightning arrestors? In other words, has anyone actually 
demonstrated that in the event of a particular real-world strike/fault, 
they actually absorb work? As in, do they absorb enough energy to 
protect equipment that otherwise would have failed, but do so without 
also blowing up and turning into a fireball electrical hazard?

/wk




Kirk Herander wrote:
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> 
> The Delta brand of arrestors, such as the LA302R (ac) and the LA602DC do
> not have a standard “UL” mark but rather the backwards “UR” mark. I
> understand this mark is for listed individual components and not
> stand-alone electronics. According to the UL website, the UR marks “…..
> are specifically used on component parts that are part of a larger
> product or system. These components may have restrictions on their
> performance or may be incomplete in construction.”
>  
>  I have been told by several inverter OEMs that they can’t recommend any
> lightning arrestor “because none are UL listed”. What then does this
> component mark really mean? Nothing? Why not recommend them if used
> within their “restrictions”? 
>  
> Thanks for comments.
>  
>  
> Kirk Herander
> Vermont Solar Engineering
> 802.863.1202
> fax 802.863-7908
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