About the Author: John Marchetti – 15+ years as a commercial sign installer, ICC-certified commercial inspector, and licensed electrical contractor in six states. He has built signage for 14 Fortune 500 companies and currently serves on the National Electrical Code (NEC) Sign Subcommittee for Article 600. All technical references in this article come from the 2023 NEC, UL 879 (LED sign components), and IBC wind
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