[Code of Federal Regulations] [Title 30, Volume 1] [Revised as of July 1, 2002] From the U.S. Government Printing Office via GPO Access [CITE: 30CFR56.4502] [Page 265] TITLE 30--MINERAL RESOURCES CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR PART 56--SAFETY AND HEALTH STANDARDS--SURFACE METAL AND NONMETAL MINES--Table of Contents Subpart C--Fire Prevention and Control Sec. 56.4502 Battery-charging stations. (a) Battery-charging stations shall be ventilated with a sufficient volume of air to prevent the accumulation of hydrogen gas. (b) Smoking, use of open flames, or other activities that could create an ignition source shall be prohibited at the battery charging station during battery charging. (c) Readily visible signs prohibiting smoking or open flames shall be posted at battery-charging stations during battery charging.