Section 39.291. Guarding live and moving parts

(a) Current-carrying parts. Current-carrying parts connected to circuits above 150 volts to ground shall be so isolated or guarded that no person may inadvertently come in contact with them. Reference should also be made to § 39.199 (relating to guarding or isolating live parts).

(b) Conductors. Conductors over 150 volts to ground in locations accessible to the public shall be run in conduit, armored cable, or molding, the exposed metallic parts of which shall be permanently grounded.

(c) Equipment. Guards for the current-carrying parts of unisolated electrical equipment, such as controllers, motors, transformers, automatic cut-outs, circuit breakers, switches and other devices, shall consist of cabinets, casings, or shields of permanently grounded metal or of substantial insulating material.

(d) Arcing or suddenly moving parts. These parts of electrical equipment, including fuses and the handles and arc chutes of circuit breakers, shall be so isolated or guarded that the liability of persons struck or burned by sparking, flashing, or movement during operation is reduced as far as practicable.