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This is not a defense of UL due to my deep love of their policies, requirements, inspections, attitudes, CRDs, pricing structure spasm... but they are playing the OSHA NRTL game as everyone else is entitled to do. OSHA does not obligate NRTLs to accept each other's data. UL apparently does not...

1.) Safety-critical components in a UL-Listed product must be UR. You can't get away from that. 2.) This item contains within it shocky stuff. That's going to be safety-critical as it has to properly contain the shocky stuff. 3.) There is no standard which states this. This is a policy of UL...

Dominic - what kind of signs do you make?

cbroumand: Typically it is the market and ones own legal department that will force a UL Listing. Technically I can sell my product (a high-voltage component) without UL, but no one would buy it. Also, the corp. would never consider the possibility just for product liability reasons. Good...

Jmadadek: Just a few side notes. First, make sure you buy UL 50 12th Edition Non-environmental Conditions. UL 50E is really for equipment boxes, and UL 50 11th will require a retest in 5 years anyway. I recommend buying it from IHS.com. Second, once your company has the box Listed, you are a...

Interestingly, not only does ETL (Intertek) have a voting seat on the UL xxxx Standards Technical Panel, but also has a non-voting member of a company I know favors them (per my 03-May comment above.) The dynamics and politics of the committee are beyond me at this point. I'm not sure of the...

A few new items, FYI: *<note: I am not bashing ETL; this is merely information I have gathered for anyone else with this question.> Our primary competitor switched to ETL. In a discussion with our Director of Marketing, a VP stated it was a horrible decision and are switching back to UL. You...

Does anyone have direct experience with the listing process of ETL, and a possible comparison with UL? I'm not interested in the acceptance of either mark, just the technical/customer service aspect of dealing with them. Positive? Negative? Any sources I might reference for an evaluation by...

I have a CTDP lab which is to be audited by UL to ISO 17025 this year. Has anyone been audited and passed, or had non-conformances and can share insights, etc.? Name of auditor and impressions, experiences? We make transient and surge arresters, so we have a lot of high-energy equipment. I...

david: yes, I guess that was obvious after all. pvamet: You are fine; enjoy the cost savings. If a customer requires a full system listing, I hope they are a high-volume buyer.

If I understand you correctly, this product is sold under a multiple listing. Cosmetic differences are not included in the ML paperwork. I don't see any issue other than the liability mentioned above.

"If they wish to comply with the ANSI standard, they must purchase and install equipment that is not UL listed." I'm sorry, I don't quite understand this remark. Which ANSI standard is this? I haven't run across a mandate of "not-UL-Listed."

It is somewhat clunky and frustrating (it's UL after all) but checking on questionable products may be done here: http://database.ul.com/cgi-bin/XYV/template/LISEXT/1FRAME/index.htm You can check by manuf., UL File number, etc. Regards,

Any change in critical components (esp. safety-related) must generate a file review. That tracking should be done by your code compliance engineer in conjunction with the design engineers. The notes are interesting and perhaps helpful, but strictly speaking, do not belong on the drawing.