30 C.F.R. § 77.509 Transformers; installation and guarding.
Title 30 - Mineral Resources
(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. (b) Transformer stations shall be enclosed to prevent persons from unintentionally or inadvertently contacting energized parts. (c) Transformer enclosures shall be kept locked against unauthorized entry.
Title 30: Mineral Resources
PART 77—MANDATORY SAFETY STANDARDS, SURFACE COAL MINES AND SURFACE WORK AREAS OF UNDERGROUND COAL MINES
Subpart F—Electrical Equipment—General
§ 77.509 Transformers; installation and guarding.
