TITLE 30 - MINERAL RESOURCES

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

SUBCHAPTER B - TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS

PART 18 - ELECTRIC MOTOR - DRIVEN MINE EQUIPMENT AND ACCESSORIES

subpart b - CONSTRUCTION AND DESIGN REQUIREMENTS

18.30 - Windows and lenses.

  (a) MSHA may waive testing of materials for windows or lenses except headlight lenses. When tested, material for windows or lenses shall meet the test requirements prescribed in 18.66 and shall be sealed in place or provided with flange joints in accordance with 18.31.

  (b) Windows or lenses shall be protected from mechanical damage by structural design, location, or guarding. Windows or lenses, other than headlight lenses, having an exposed area greater than 8 square inches, shall be provided with guarding or equivalent.