MSHA - Code of Federal Regulations - 30 CFR 57.14107
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MSHA - Title 30 CFR
30 CFR § 57.14107
Moving machine parts.

(a) Moving machine parts shall be guarded to protect persons from contacting gears, sprockets, chains, drive, head, tail, and takeup pulleys, flywheels, coupling, shafts, fan blades; and similar moving parts that can cause injury.

(b) Guards shall not be required where the exposed moving parts are at least seven feet away from walking or working surfaces.

For more information: See MSHA'S Program Policy Manual