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UL 1449
A UL
(UNDERWRITER'S LABORATORIES) safety specification that surge suppression
products are tested against. This specification includes a requirement that
surge suppression devices be marked with the surge let-through voltage for a
specific UL test
UL Approved
This is a widely
used term which is technically not correct. The correct terms are UL
Listed or UL Recognized.
UL Listed
UL grants this form of approval to equipment that will be user installed or
operated and that is found to meet the safety requirements of the applicable
UL standards. If a product is UL Listed, then it must be marked with the UL
insignia.
UL Recognized
This is a form of formal
approval granted by UL to devices that are not used as free standing
equipment on their own, but are to be installed into some other system by a
manufacturer, electrician, or possibly by an end user. Examples of UL
Recognized equipment are wall switches, wire connectors, wires, fuses, and
circuit breakers. (See also UL Listed above).
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