StacksVerified U.S. regulatory reference

30 CFR §77.509

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Transformers shall be of the totally enclosed type, or shall be placed at least 8 feet above the ground, or installed in a transformer house, or surrounded by a substantial fence at least 6 feet high and at least 3 feet from any energized parts, casings, or wiring.
  2. (b)Transformer stations shall be enclosed to prevent persons from unintentionally or inadvertently contacting energized parts.
  3. (c)Transformer enclosures shall be kept locked against unauthorized entry.