AtTheKeyboard
Member
- Location
- Colorado
Is there any chance someone can help me find a code exception, or some other reason why I can't find a *Listed* Duct Temperature Sensor commercially available?
The following item was submitted, and was returned, as was not listed. This resistor is supplied/monitored by a digital control unit, which is supplied by a Class 2 power source. Am I correct that this must be a listed product, despite being on a Class 2 power system?
As the Contractor was revising the submission, they noted that they couldn't find a listed product. From my follow-up check, I too am not finding any indications of listing, including from some larger/familiar brands, including Siemens and Johnson Controls. I see indications of specification compliance, mentions of NEMA enclosure ratings, EMC compliance, and expected technical terms - but not a listing.
Is it generally accepted that these devices do not need to be NRTL-listed? Is there a reason why?
The following item was submitted, and was returned, as was not listed. This resistor is supplied/monitored by a digital control unit, which is supplied by a Class 2 power source. Am I correct that this must be a listed product, despite being on a Class 2 power system?
As the Contractor was revising the submission, they noted that they couldn't find a listed product. From my follow-up check, I too am not finding any indications of listing, including from some larger/familiar brands, including Siemens and Johnson Controls. I see indications of specification compliance, mentions of NEMA enclosure ratings, EMC compliance, and expected technical terms - but not a listing.
https://www.galco.com/techdoc/sieh/qam2021.750_cp.pdf
http://www.kele.com/Catalog/21 Temperature/PDFs/Siemens averaging datasheet.pdf
https://www.johnsoncontrols.com/-/m...hash=FC0C00E9829B2E3F3C0511AFB8ADB8E7F96F1400
https://www.johnsoncontrols.com/~/m...es/be_instabulliten_wallmountsensor.pdf?la=en
http://www.kele.com/Catalog/21 Temperature/PDFs/Siemens averaging datasheet.pdf
https://www.johnsoncontrols.com/-/m...hash=FC0C00E9829B2E3F3C0511AFB8ADB8E7F96F1400
https://www.johnsoncontrols.com/~/m...es/be_instabulliten_wallmountsensor.pdf?la=en
Is it generally accepted that these devices do not need to be NRTL-listed? Is there a reason why?