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15 cm high 30 cm2 fixed adequate strength anchorage board or plank building competent person Conference counterweights crab or winch crane driver derricking drum diameter Eegulation employer erected exceed 85 cm factor of safety fall of material fixed at least floor or platform gangway or run guard-rail and toe-boards guard-rail or guard-rails height to prevent hoisting appliance hoisting machine hoisting or lowering International Labour International Labour Conference INTERNATIONAL LABOUR OFFICE International Labour Organisation Ladder Scaffolds least 30 cm2 ledgers less than 15 lifting gear material and tools maximum load maximum safe means of suspension outriggers prevent the fall prevent the workers properly pulley raising or lowering Regulation ropes or chains run or stair Runs and Stairs safe working load safeguards safety belts securely fastened slings suitable guard-rail supported taken to prevent test and examination travelling crane unless uprights vertical opening wall width Winch drums wire ropes workmen