The most likely reason I can think of is that some companies "demand"
either a UL or TUV mark specifically hence the dual marking. I knew of
one company that would accept a test report only from a specific
laboratory.
Both UL and TUV are NRTLs. It is also possible that TUV met some
specific European credibility in a specific place. I also believe, but
am not entirely sure, that products for use in restricted locations is
a UL workaround not generally compliant with EN Standards and not
generally available for CE Marked products. Other than the differences
between listings and R/C status and compliance variations thereto, it
is strange. However, a company CAN obtain both a listing and a
recognized component on the same product to suit their own purposes.
Comments?
Warren Birmingham
On Wednesday, Oct 9, 2002, at 09:42 US/Pacific, soundsu...@aol.com
wrote:
From Doug McKean:
>>>>>>>>In 20 years, I've never seen this before but that's not saying
much.
Why would a mfr get a UL recognition approval for a commercial
ITE style single phase 155-230vac computer style product but for
that same product get the TUV "GS" mark?
Mfr is a stateside company.
Product to be used in restricted areas with trained personnel only.
But, one that essentially anyone could buy.
What's the advantage of getting such a mixed set of approvals?
<<<<<<<<<<<<
It's not really a mixed set of approvals. UL must have considered the
device to be incomplete in some way (does it have an enclosure?),
therefore they Recognized it as a component as opposed to Listing it
as a finished product. The GS Mark has no mechanism for delineating
between components and finished products - both can receive GS
approval. Hence the TUV GS mark.
That's my guess, based on the limited information you gave.
Greg Galluccio
www.productapprovals.com
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