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YOUR EXPERT for Wiring Duct- sponsored by Panduit Corp.

Chris Meadows

Product Line Manager
Panduit Corp.

Chris has a B.S. in Industrial Technology from Illinois State University and an MBA from Lewis University. Chris has been with Panduit for the past 17 years - more than half of which was spent in manufacturing engineering functions before moving into product line management for wiring duct. In his current role, he is responsible for the design, development, product management and manufacturing of the wiring duct product line. Chris is fielding questions in the area of wiring duct usage in electrical control panels. Categories include material selection and characteristics, wirefill calculation, and installation methods.

Archive for January, 2006

Divider wall
Tuesday, January 31st, 2006 @ 11:18 am


Q.		In certain circumstances, UL 508 requires separation/spacing between low and medium voltage conductors running in the same channel (duct). Can I use divider wall to separate these conductors?


A.		Per UL 508 Section 15, separation is required when the conductors are not insulated for the maximum voltage for either circuit. In an installation where separation by air spacing is not appropriate, an insulating barrier, such as a divider wall, is allowed. The divider wall must be manufactured from an insulating material, such as PVC, exhibiting minimum properties described in UL 508 Section 15. These properties include High Current Arc Resistance to Ignition (HAI), Hot Wire Ignition (HWI), Comparative Tracking Index (CTI), electrical Relative Thermal Index (RTI) and UL 94 flame class. Check with your supplier to make sure the divider wall is compliant with these requirements.

Maximum temperature and humidity
Tuesday, January 31st, 2006 @ 11:18 am


Q.		What is the maximum use temperature and humidity for wiring duct?


A.		Most PVC wiring duct is UL recognized up to a maximum use temperature of 50 C/122 F. Since PVC material is not hygroscopic, it should perform as intended at a humidity up to 80 percent. If the inside of the enclosure is going to have prolonged exposure to temperatures above 50 C/122 F, than it is recommended to use a wiring duct made from a Polyphenylene Oxide (PPO) material that is typically UL recognized for 95 C/203 F

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