MSHA - Code of Federal Regulations - 30 CFR 56.12067
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MSHA - Title 30 CFR
30 CFR § 56.12067
Installation of transformers.
Transformers shall be totally enclosed, 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.