Defines power operated temporarily installed builders hoists (referred to as "hoists" here) intended for use by persons who are permitted to enter sites of engineering and construction, serving landing levels, having a carrier: - designed for the transportation of persons or of persons and materials; - guided; - travelling vertically or along a path within 15 degrees max. of the vertical; - supported or sustained by drum driven wire rope, rack and pinion, or an expanding linkage mechanism; - where masts, when erected, may or may not require support from separate structures.