UL listing of lightning arrestors [RE-wrenches]

[Allan Sindelar]

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Kirk,
As I understand it, the backwards-UR means recognized when used as part of a
listed assembly. This means that the product can't be used as a stand-alone
component, installed by us in general application. It may be installed by a
manufacturer as part of a listed product, meaning, for example, that a
manufacturer of a listed product can include it and the entire assembly is
thus listed. It would also apply to a listed assembly shop, such as Energy
Outfitters or Conergy (and there are others, of course) being able to
include it as part of a listed assembly, such as an Outback PS system.

When the inverter OEMs say that "they can't recommend any lightning arrestor
because none are UL listed", you're supposed to listen between the lines.
Most manufacturers would prefer to see surge protection on their equipment.
Outback even requires DC surge protection in a system in order to cover
lightning damage as part of their MX60 warranty. The product goes in after
inspection. You didn't get this from me, though...

Allan at Positive Energy

-----Original Message-----
From: Kirk Herander [mailto:kirk at vtsolar.com]

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"?


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