Section 1605.3 - Requirements for Hoisting Towers(a) Material hoist towers shall be constructed of structural steel, steel pipe, wrought iron, or other equivalent.(b) All sheaves, guy ties, bolt connections, miscellaneous clamps, braces, and similar parts shall be regularly inspected after the installation is initially placed in operation, and at least once each month thereafter. All broken, defective, and worn parts shall be replaced or repaired.(c) Hoist-operating rules shall be established and posted in conspicuous locations adjacent of the hoist to the operator's station and the structure it serves. The operating rules shall include the following: (2) Provision for authorized riding on the hoist platform for the purpose of inspection and servicing only.(3) Acceptable safe procedures for loading and unloading cages, platforms, and buckets.(4) Operating procedures including allowable line speed for various loads.(5) A sign on the car frame reading "No Riders Allowed."(d) All material hoist towers shall be designed by licensed professional engineers.Cal. Code Regs. Tit. 8, § 1605.3