I'm doing an in-house UL review at our 508A panel shop on a panel that we built before it ships out. Everything checks out, all parts are UL listed but one. A potentiometer mounted on the cabinet door. Im wondering if we can use this part. Its wired up to a VFD and adjusts the speed of the motor. I've asked around and got a few answers. One person said that a potentiometer is just a resistor so it doesn't need a UL rating. Another person said that it is part of a low voltage limited energy circuit. Are any of these acceptable work arounds? Ive put a link to the part below. Thanks.
xnuke
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RE: UL 508A Industrial Control Panel with a non UL listed part.
xnuke
"Live and act within the limit of your knowledge and keep expanding it to the limit of your life." Ayn Rand, Atlas Shrugged.
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.