[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: 30CFR18.23] [Page 95] 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. 18.23 Limitation of external surface temperatures. The temperature of the external surfaces of mechanical or electrical components shall not exceed 150 deg.C. (302 deg.F.) under normal operating conditions.