[Code of Federal Regulations] [Title 30, Volume 1] [Revised as of July 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 30CFR18.45] [Page 108-109] TITLE 30--MINERAL RESOURCES CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR PART 18_ELECTRIC MOTOR-DRIVEN MINE EQUIPMENT AND ACCESSORIES--Table of Contents Subpart B_Construction and Design Requirements Sec. 18.45 Cable reels. (a) A self-propelled machine, that receives electrical energy through a portable cable and is designed to travel at speeds exceeding 2.5 miles per hour, shall have a mechanically, hydraulically, or electrically driven reel upon which to wind the portable cable. (b) The enclosure for moving contacts or slip rings of a cable reel shall be explosion-proof. (c) Cable-reel bearings shall not constitute an integral part of a circuit for transmitting electrical energy. (d) Cable reels for shuttle cars and locomotives shall maintain positive tension on the portable cable during reeling and unreeling. Such tension shall [[Page 109]] only be high enough to prevent a machine from running over its own cable(s). (e) Cable reels and spooling devices shall be insulated with flame- resistant material. (f) The maximum speed of travel of a machine when receiving power through a portable (trailing) cable shall not exceed 6 miles per hour. (g) Diameters of cable reel drums and sheaves should be large enough to prevent undue bending strain on cables.