Inaxsys Security Systems | 03/25/15 12:57pm
there is a good description here of the different terminology used by UL: http://ul.com/corporate/faq/general/terminology/
Inaxsys Security Systems | 03/25/15 01:02pm
Reading carefully, the difference seems to be that "products" are UL-listed and "components" (those parts that make up a "product") are UL-recognized.
With this definition, i'm not sure how a controller qualifies as a UL-Recognized "component" that is part of a "product"?
Silva Consultants | 03/25/15 03:44pm
In the strictest terms, UL Recognized Components are designed to be put within an assembly of some type (control panel, gate operator, etc.) which would then itself be capable of becoming UL Listed.
For example, in the case of a gate operator, a manufacturer might use UL Recognized relays and motors within the operator. He would then take the operator itself to get tested to obtain a UL Listing for the overall operator. It is my understanding that using UL Recognized Components speeds up the testing and approval process for the UL Listing.
If an AHJ requires a listing from a "recognized testing laboratory" (usually a code word for UL, but there are other labs), then just having a UL Recognized Component label may not cut it.
I'm not sure how this applies to access controller boards. Perhaps the intent is that the board would be placed in an enclosure (with or without a power supply) and that the completed assembly would then be submitted to obtain a UL Listing? Not sure.