UL listing of lightning arrestors [RE-wrenches]

[Bob Ellison]

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Hi Kirk,
I had a conversation with them about this a year or so ago. If you give them
a call they will explain it. Here is my recollection on how the conversation
went,
Seems the UL spec requires a different media inside than the (sand?) that is
there. Sounds like the UL spec was written to fit a different unit. Go
figure.

Later,
Bob

-----Original Message-----
From: Kirk Herander [mailto:kirk at vtsolar.com] 
Sent: Wednesday, April 12, 2006 5:33 PM
To: RE-wrenches at topica.com
Subject: UL listing of lightning arrestors [RE-wrenches]

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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
NABCEP(tm) Certified Solar PV Installer
Xantrex Certified Dealer Charter Member
NYSERDA-eligible installer
VT Solar and Wind Partner
 

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