UL listing of lightning arrestors [RE-wrenches]

[Aaron Wellendorf]

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Kirk,

There are UL listed lightning arrestors for AC systems. I don't know of UL
listed models for DC. 

Delta has told me that the only difference between their AC and DC varieties
is the color of the wires.

Square D makes a hard-wired secondary surge arrestor, model #SDSA1175, which
mounts similarly to the Delta brand in a 1/2" knockout, and it costs about
the same as the Delta LA302R. 

The SDSA1175 specs out of the Sq D catalog page 5-4 are:
- suitable for use in service entrance locations
- meets requirements of NEC Article 280
- cULus listed and CSA Certified secondary surge arrestors
- meets ANSI/IEEE C62.11-1993
- suitable for indoor and outdoor applications
- LED indicates operational status

Sq D also makes UL listed "surgebreakers" (pop into a 2-pole breaker space),
and also transient voltage surge suppressors, some with noise filters.

I have used a different brand of AC surge arrestor with noise filtering to
quiet the AC line into a grid-tied Trace SW4048 back in 1999. It didn't
completely filter out all noise, but it did make my customer's favorite
680AM radio station listenable vs. a totally static roar. I put them on all
my systems after that, SW or not.

Aaron Wellendorf
DC Power Systems (PV distributor)
NABCEP certified installer
707-433-5824x121



-----Original Message-----
From: Kirk Herander [mailto:kirk at vtsolar.com] 
Sent: Wednesday, April 12, 2006 2:33 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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