Jon,
Regarding point #1:
Think of it this way ...
UL "Listing" (UL logo) means system level, compliant
with some standard for a "system" under a lot of
conditions. Mostly along the lines of construction
AND performance.
UL "UbackwardsR" means component level, a restricted
compliance with a standard. As in the case of
transformers, compliant possibly only by way of
construction.
Assembling a bunch of parts that have component
level approval together into a system isn't
sufficient for the system to be automatically
approved. The system must be tested.
Alternatively, a system which is "Listed" that
was put together with a bunch of unapproved parts
does not make the parts automatically approved
for use in another system.
Regarding point #2:
UL is the only NRTL which can apply the UbackwardsR
for component approval or the UL logo for system
Listing. It's a trademark of UL. ETL is another
NRTL which has their trademarked logo for product
listing.
Regarding point #3:
I believe there's a review within the CB scheme for
local variations once you've you've passed. But I
believe your premise is solid.
Regarding question #4:
Not sure how to answer that one since I'm not sure
what's meant by "certificate". A qualified test
house is an NRTL or is in association with an NRTL
(they do testing then pass along the results to the
NRTL for review). The NRTL allows applying their
logo to your product.
Regarding the final points raised
by your marketing people:
- IF your product is a component, or is an assembly
that can be considered a component (like a transformer
or even a power supply), then they're correct.
- IF your product is some stand alone system, then
you'll have to go for "Listing".
Regards, Doug McKean
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