(1) Power shut-off requirements. Electric and pneumatic hand tools shall be disconnected from power sources and the pressure in hose lines shall be released before any adjustments or repairs are made except for the replacement of bits in electric drills. Before disconnecting any air hose, the air shall be shut off. Every electric and pneumatic hand tool shall be equipped with a cut-off switch within easy reach of the operator.

(2) Electric and hose lines. Electric and hose lines shall be guarded by location or by covering to prevent severe abrasion and to prevent any tripping hazard.

(3) Grounding of electrical tools. Electrically operated hand tools shall be grounded during use. The ground wires shall be connected to the frames of the tools and the other ends shall be properly grounded. Approved double-insulated type portable hand tools are exempt from this grounding requirement.