A "Listed" item is complete unto itself. A "Recognized" component is intended to be incorporated into an end product. Wire is a very good example since there are both types. Listed wire may be used to wire a building, but Recognized wire may only be used inside equipment. The UL report will contain a list of "Conditions of Acceptability" for a Recognized part which must be observed when the item is incorporated. These conditions can sometimes be a real pain. Let me give you an example - dc fans. I have seen some where no locked rotor test had been performed and the suitability of the plastics was not tested. So what the #$@% did UL do? Anyway, before you incorporate a Recognized part into your design, obtain the Conditions of Acceptability from the manufacturer.
Richard Woods Sensormatic Electronics wo...@sensormatic.com Views expressed by the author do not necessarily represent those of Sensormatic. > ---------- > From: do...@ftc2.aei.com[SMTP:do...@ftc2.aei.com] > Reply To: do...@ftc2.aei.com > Sent: Tuesday, July 14, 1998 5:33 AM > To: emc-p...@majordomo.ieee.org > Subject: UL Approved vs Recognized > > > Hello group, > > I have recently been in discussions about what is the "real" difference > between UL Recognized and UL Approved. In this instance it was about wire > > but I believe that it applies to most any product. If UL recognition is > not > as rigorous as approval but am I able to rely on recognized parts for > safety > applications? Just what is the distinction? My experience has been with > NRTL/C and GS marking but never component approvals through UL. > > Thanks, > > Doug Powell, Compliance Engineer > Advanced Energy Industries, Inc. > Ft. Collins Colorado USA > > >
