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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
27.41 - Test to determine resistance to moisture.
Components, subassemblies, or assemblies, the normal functioning of which might be affected by moisture, shall be tested in atmospheres of high relative humidity (80 percent or more at 65?-75 ?F.) for continuous operating and idle periods of 4 hours each. The component or subassembly or assembly shall function normally after being subjected to those tests.
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