30 CFR 77.900 - Low- and medium-voltage circuits serving portable or mobile three-phase alternating current equipment; circuit breakers.

Code of Federal Regulations - Title 30: Mineral Resources

Updated to: December 30, 2005

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TITLE 30 - MINERAL RESOURCES

CHAPTER I - MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR

SUBCHAPTER O - COAL MINE SAFETY AND HEALTH

PART 77 - MANDATORY SAFETY STANDARDS, SURFACE COAL MINES AND SURFACE WORK AREAS OF UNDERGROUND COAL MINES

subpart j - LOW- AND MEDIUM - VOLTAGE ALTERNATING CURRENT CIRCUITS

77.900 - Low- and medium - voltage circuits serving portable or mobile three - phase alternating current equipment; circuit breakers.

Low- and medium-voltage circuits supplying power to portable or mobile three-phase alternating current equipment shall be protected by suitable circuit breakers of adequate interrupting capacity which are properly tested and maintained and equipped with devices to provide protection against undervoltage, grounded phase, short circuit, and over-current.