Monday, March 6, 2023
Hello CQD. Will drilling a self-tapping screw(s) on the bottom of the Main panel void the UL listing? Thanks, Joaquin Corrales
Hello Joaquin, thanks for the question. Unfortunately, there is not enough information to provide a definitive answer for your situation. Many panelboard enclosures are designed with the intention to be drilled into for conduit entry or drilled and tapped to add a ground bar etc. The only way to know for sure is to check with the manufacturer’s installation instructions, and the listing information from the NRTL that listed the enclosure.