GroundRules
30 CFR 27.38: Tests to determine adequacy of windows and lenses.
Where this section sits in the code
- Title 30—Mineral Resources
- CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
- SUBCHAPTER B—TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS
- PART 27—METHANE-MONITORING SYSTEMS
- Subpart C—Test Requirements
Impact tests. A 4-pound cylindrical weight with a one-inch diameter hemispherical striking surface will be dropped (free fall) to strike the window or lens in its mounting or the equivalent thereof at or near the center. At least three out of four samples shall withstand the impact according to the following table:
Overall lens diameter (inches) Height of fall (inches)
Less than 4 6
4 to 5 9
5 to 6 15
Greater than 6 24
Lenses or windows of smaller diameter than 1 inch may be tested by alternate methods at the discretion of MSHA.
Collected 2026-08-27T02:25:24Z. Source file · JSON