MCG SURGE PROTECTION July 24. 2007UL Listed Versus UL Compliant: What’s the Difference?
Important Information About UL You Need to Know MCG Surge Protection, along with other manufacturers of TVSS equipment, have long complied with UL standards in order to be able to carry the UL mark – a universally recognized symbol of safety to industry, users, specifiers and the insurance companies that underwrite the protected facilities.

UL recently revised its standard for TVSS safety by mandating much more stringent testing. This revision is called: UL 1449 2nd Ed. Listed including new requirements of Feb. 9, 2007. The new tests, like the old ones, apply an abnormally high AC voltage to the protector, but at lower AC current-limited levels. These lower current levels are what differentiate the new tests from the UL1449 2nd edition 1996 tests, and cause certain protectors to fail in an unsafe manner. The purpose of the new requirements is to ensure that a surge protector, should it fail, will do so in a safe manner.  Now TVSS manufacturers were faced with a dilemma – test to the new standard, drop the products or lose UL 1449, 2nd. Ed. Listing. Sending an extensive product line to be tested is a costly, time-intensive project. As a result, several manufacturers pulled out of the TVSS business entirely. And not just small companies – big companies.
Some manufacturers are relying on the customer not being aware of the new standard and continue to promote the outdated standard - simply UL 1449, 2nd Ed. Listed. There is a limited life span on this approach because UL will require the statement be pulled. Only products listed to the new standard can say “UL 1449 2nd Ed. Listed”.
Other companies elected to bypass UL altogether and test to the new requirements using an independent, non-UL lab. Cost savings are substantial and turnaround is significantly faster. Problem – testing to the standard and being compliant to the standard does not confer a UL listing. If there’s no UL listing, there’s no UL mark. It cannot be displayed on any units tested outside of UL.
Manufacturers who used other labs are taking great care to make it look like they are UL-listed, or in the event a potential customer reads the fine print, to assure that UL compliant is the same as UL Listed. They use the words, “Products Listed or Compliant to new UL Requirements”, and even wrap them in gold starbursts for authenticity. Big Question: If TVSS (or any other electrical equipment) is not UL-listed, will your insurance company pay on a claim should a calamity, such as a fire or an explosion, occur?
Conclusion: Read the specs – UL listed means a unit may bear the UL mark. UL compliant units tested outside of UL will bear the mark of the independent testing lab, not the UL label.
MCG has invested the time and money in the UL Listing. We meet the specs and can legitimately display the UL mark on our TVSS equipment.

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  MCG – Not Just Compliant, UL Listed. MCG Surge Protection