Safety can means an approved container, of not over 5 gallons capacity, having a spring-closing lid and spout cover. Safety fuse means a flexible cord containing an internal burning medium by which fire is conveyed at a continuous and uniform rate for the purpose of firing blasting caps or a black powder charge. Safety switch means a sectionalizing switch that also provides shunt protection in blasting circuits between the blasting switch and the shot area. Scaling means removal of insecure material from a face or highwall. Secondary safety connection means a second connection between a conveyance and rope, intended to prevent the conveyance from running away or falling in the event the primary connection fails.
Shaft means a vertical or inclined shaft, a slope, incline, or winze.
Short circuit means an abnormal connection of relatively low resistance, whether made accidentally or intentionally, between two points of difference potential in a circuit. Stray current means that portion of a total electric current that flows through paths other than the intended circuit. Substantial construction means construction of such strength, material, and workmanship that the object will withstand all reasonable shock, wear, and usage to which it will be subjected. Suitable means that which fits, and has the qualities or qualifications to meet a given purpose, occasion, condition, function, or circumstance. Travelway means a passage, walk or way regularly used and designated for persons to go from one place to another.