Mike Dolt Enterprises
Mike Dolt Enterprises
User: anbm, Location: TX
Asked on: Wednesday, March 19, 2025 at 1:05 pm EDT
Answered on: Wednesday, March 19, 2025 at 1:05 pm EDT
Question: Which NEC section requires transformer secondary protection and the protection must be within 10 feet from the transformer?I typically see elec. panel downstream of a xfmr located next to it...
The NEC section that addresses transformer secondary protection and the "10-foot rule" is NEC 240.21(C). This section covers secondary conductor protection. Within that section, the specific rule you are referring to is generally found within subsections like 240.21(C)(1), 240.21(C)(2), or 240.21(C)(3), depending on the specific installation details and application. Flag for review