OutBack PV Combiners - ETL listing [RE-wrenches]

[Christopher Freitas - OutBack Power]

> The Outback combiner is also not UL listed but I do see and ETL
> sticker on the outline drawing.  At least I could not find a 
> listing anywhere on their documentation.  It does show that it uses 
> UL listed breakers, but I doubt that covers the entire assembly.    
> What is the difference between ETL and UL?

The OutBack PSPV combiner is ETL listed under UL1741 as a Photovoltaic 
accessory.  The enclosure is approved by ETL under UL50 as a Type 3R 
enclosure.  The assembly is managed under UL508 - industrial control 
equipment.  The breakers, fuseholders and terminal strips are all 
individually approved by UL and have been evaluated by ETL specifically 
for this application.  

The same authority which gives UL its power (OSHA) also approves ETL as 
a Nationally Recognized Testing Lab (NRTL).  The NEC does not require UL 
specifically - it requires that the products be evaluated and approved 
only by a NRTL - such as UL or ETL or a few others.  
  
For more info on OSHA / NRTLs / UL / ETL see this following link:

http://www.osha.gov/dts/otpca/nrtl/

Also - check out Don Loweburg's next column in Home Power for some 
timely commentary on UL.  

Christopher Freitas
OutBack Power Systems, Inc.
cfreitas at outbackpower.com  www.outbackpower.com
Tel 360 435 6030  Arlington WA USA

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