WAC 296-96-24655. Sheaves and supporting members

(1) The minimum sheave diameter shall be 40 times the diameter of the rope used. For example, a 9.525 mm (0.375 in.) rope requires a 381 mm (15 in.) diameter sheave. (2) The overhead supporting members shall be designed, based upon impact loads, with a safety factor of: (a) 9 If wood; and (b) 5 If steel.