1. (a) Blocks and sheaves shall be in proportion to the size, strength, and design of the cables used.
2. (b) Sheaves shall be of mild steel or better, and bearings shall be of a material and type designed for the purpose for which they are being used.
3. (c) The bearings shall be kept well lubricated; sheaves with badly corrugated cable grooves or grooves smaller than the cable in use, shall not be used.
4. (d) All blocks shall be designed and maintained to prevent fouling.
5. (e) The bearing and yoke pins of all blocks shall be securely fastened.

Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.