MSHA - Code of Federal Regulations - 30 CFR 27.41
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MSHA - Title 30 CFR
30 CFR § 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.