MSHA - Code of Federal Regulations - 30 CFR 77.407
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MSHA - Title 30 CFR
30 CFR § 77.407
Power-driven pulleys.

(a) Belts, chains, and ropes shall not be guided onto power-driven moving pulleys, sprockets, or drums with the hands except on slow moving equipment especially designed for hand feeding.

(b) Pulleys of conveyors shall not be cleaned manually while the conveyor is in motion.