UL approval question
UL approval question
(OP)
I'm researching instruments and I'm relatively new to this line of work. I hope my question is easy to answer.
If a measuring instrument is UL listed and classified as for example, Class 1, Div 1 & 2, Groupe E, F, G (Ashcroft B-Series Switches), does this mean it is a UL approved device?
I heard it doesn't necessarily have to. It may just be a classification but not necessarily approved (like a FM approval).
If a measuring instrument is UL listed and classified as for example, Class 1, Div 1 & 2, Groupe E, F, G (Ashcroft B-Series Switches), does this mean it is a UL approved device?
I heard it doesn't necessarily have to. It may just be a classification but not necessarily approved (like a FM approval).





RE: UL approval question
RE: UL approval question
RE: UL approval question
I deal with this allot, we build outdoor power supply cabinets for cable and telecom industry. Most inspectors require the Breaker Box inside by Certified (UL or CSA). Technically the whole cabinet should be certified but they are really interested in seeing the sticker at the power connections.
Fill what's empty. Empty what's full. And scratch where it itches.
RE: UL approval question
The word "Listed" means the device has been evaluated to all possible hazardous related to a particular category. Listed products can are stand alone products that need no further investigation. If you see this on a a Hazarodus Locations product like the one you referenced in your example that means that the applicable ordinary locations standard and hazardous Locaions standard were evaluated.
The word "Classified" means that the product has been evaluated to only certain hazards. i.e. Classified Enclosures. Sometimes the ordinary location is involved sometimes not.
Like the gentleman mentioned the backwards R with the U means the device is a "Recognized Component", that has "conditions of acceptability". The conditions of acceptability express limitations on the certification and have to be evaluated in the end products use.
"Unlisted Component" a device which is for use with another part made by the same manufacturer. Doesn't have to have any markings at all.
The 5 digit lettering that appears on the products label is called a "control number" and has nothing to do with what you may find on the UL web site. The control number is specific to a manufacturer and its UL's way of designating a listing to a certain manufacturer. The CCN, Category Conrol Number, is what you want to use if you go to UL's website to look up a listing, but this usually is not on the products label. If you go to UL's website, www.ul.com, a lot of this information should be detailed.
RE: UL approval question
Thank you
RE: UL approval question
Its best to start a new thread but certainly UL itself does testing. There are third party test houses who could probably do it too. I would start with UL so you know which standards apply then solicit a third party if you want. It may get it listed quicker than UL but the cost probably won't be to much different.