Each time before raising or lowering a charging skip, the operator shall make sure that no person is located in the danger area. In addition, there shall be a safety railing constructed and installed in compliance with this Part (rule) on both sides of the charging skip so arranged as to prevent passage of any person under the raised skip.

Hoppers into which a person may fall shall be effectively guarded with a substantial iron grating consisting of crossbars of one-half inch round stock or its equivalent, spaced not to exceed five inches between bars. Maximum openings in such grating shall be one square foot in size.

Where a falling hazard exists at the point where a mixer discharges into a bucket hoist, such point shall be guarded by location, by a safety railing constructed and installed in compliance with this Part (rule) or by other equivalent means.

Flywheels and power transmission mechanisms shall be kept covered and guarded against accidental contact.

The revolving blades of trough or batch type mixing machines shall be guarded with a substantial iron grating consisting of crossbars of one-half inch round stock or its equivalent, spaced not to exceed five inches between bars and located at least five inches above the blades.