MSHA - Code of Federal Regulations - 30 CFR 57.14201
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MSHA - Title 30 CFR
30 CFR § 57.14201
Conveyor start-up warnings.
(a) When the entire length of a conveyor is visible from the starting switch, the conveyor operator shall visually check to make certain that all persons are in the clear before starting the conveyor.
(b) When the entire length of the conveyor is not visible from the starting switch, a system which provides visible or audible warning shall be installed and operated to warn persons that the conveyor will be started. Within 30 seconds after the warning is given, the conveyor shall be started or a second warning shall be given.