Code Quiz: Grounding Electrode Conductors and Weep Holes
Based on the 2026 NEC.
Question: True or false? Installation of a grounding electrode conductor through a weep hole in the bottom of a disconnect switch is permitted.
See answer below.
Answer: False
Reference: Section 250.64(G)
Explanation: Article 250.64(G) prohibits installation of grounding electrode conductors through ventilation openings, a change in the 2026 edition of the NEC now adds mounting and drainage openings as prohibited as well. Although not intended to be utilized for this purpose, weep holes are commonly used to route grounding electrode conductors. This practice is now clearly prohibited.
Lupacchino is a senior design engineer with Gaylor Electric, Inc. in Noblesville, Ind. and serves as an alternate on NEC Code-Making Panel No. 3. He is currently licensed in more than 80 jurisdictions. He can be reached at [email protected]
About the Author
John Lupacchino
Senior Design Engineer
John began his career in electrical construction as an apprentice and worked his way through the trade. He is currently licensed in more than 80 jurisdictions. With more than 35 years of experience, he now plays a vital role in Gaylor Electric’s Engineering Department, where he serves as a senior design engineer. With a focus on design engineering, quality assurance, and code compliance, he has earned the highest level of respect from industry professionals alike. John currently serves as an alternate on NFPA 70 Code Making Panel No. 3. In addition, he enjoys sharing his electrical knowledge through education. As an Associated Builders and Contractors instructor, he continues to help grow a new generation of high-performing construction leaders.