---
kind: "section"
citation: "30 C.F.R. § 77.509"
title: "30"
number: "77.509"
heading: "Transformers; installation and guarding."
url: "https://uscodex.org/cfr/30/77.509"
---

# §77.509. Transformers; installation and guarding.

- (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.

## Notes

### Authority

Authority: 30 U.S.C. 811.

### Source

Source: 36 FR 9364, May 22, 1971, unless otherwise noted.