30 C.F.R. § 75.205 Installation of roof support using mining machines with integral roof bolters.
Title 30 - Mineral Resources
When roof bolts are installed by a continuous mining machine with intregal roof bolting equipment: (a) The distance between roof bolts shall not exceed 10 feet crosswise. (b) Roof bolts to be installed 9 feet or more apart shall be installed with a wooden crossbar at least 3 inches thick and 8 inches wide, or material which provides equivalent support. (c) Roof bolts to be installed more than 8 feet but less than 9 feet apart shall be installed with a wooden plank at least 2 inches thick and 8 inches wide, or material which provides equivalent support.
Title 30: Mineral Resources
PART 75—MANDATORY SAFETY STANDARDS—UNDERGROUND COAL MINES
Subpart C—Roof Support
§ 75.205 Installation of roof support using mining machines with integral roof bolters.
