How can UL listing be better than ETL listing?
How can UL listing be better than ETL listing?
(OP)
A recent test we had completed shows a 150 TPMOV blowing up after two separate tests. This TPMOV is UL listed. This 150 TPMOV was tested at 480 volts ac at 5kA and at 480 volts ac 10 kA. Both times it was demolished. UL refused to comment, as this was not supposed to happen.





RE: How can UL listing be better than ETL listing?
UL listing can be construed to be better because:
1) Lots of specifying engineers have UL in their specs, but no substitutes like ETL, CSA, TUV, MET, etc...
2) When building a product to be UL listed, only UL listed parts will be approved.
Testing-wise, UL is equal to ETL, TUV, CSA, MET, and the others. Except UL is way more expensive.
Best to you,
Goober Dave
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RE: How can UL listing be better than ETL listing?
RE: How can UL listing be better than ETL listing?
I have heard of UL fining people for using devices other than UL listed in this case being fined, but I have also heard that is illegal for UL to fine them. Any information about this?
RE: How can UL listing be better than ETL listing?
On the issue of exploding MOVs -- the samples that UL tested did not explode under the test procedures in the standard. There is not a guarantee that the MOVs will work properly under the manufacturer's specifications.
In other words, the test labs (all of them) only run the tests specified in the standard. There's no guarantee that the product will meet the manufacturer's spec.
Best to you,
Goober Dave
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RE: How can UL listing be better than ETL listing?
Best to you,
Goober Dave
Haven't see the forum policies? Do so now: Forum Policies
RE: How can UL listing be better than ETL listing?
RE: How can UL listing be better than ETL listing?
Best to you,
Goober Dave
Haven't see the forum policies? Do so now: Forum Policies
RE: How can UL listing be better than ETL listing?
UL is far more stringent that ETL...
and
If your product will ever be a component in another product/system that requires listing/certification then use UL or make darn sure that your product will NEVER go into a system that uses UL for approval..
and its OSHA that should get a slap on the wrist for not enforcing that all NTRL's are equal as far as accepting other NRTL's certifications/documents,etc...
All other NRTL's besides UL have no problem accepting each others data.. UL will just throw everyone elses in the trash as meaningless to them..
RE: How can UL listing be better than ETL listing?
Also, the test criteria for SPDs (the new terminology) under UL1449 has changed a lot in the past few years. To be fair, you must know the "Edition" of the test standard. The latest, the 3rd Edition that came out in 2009, and substantially increased the testing requirements. So if you tested a device that was listed under Edition 2, against the Edition 3 tests, yes, it would likely fail.
"Will work for (the memory of) salami"