There shall be at least 2 hoisting ropes. Each rope shall be:

(1) Made of a good grade of elevator traction wire rope;

(2) At least 3/8 in. in diameter and possessing a safety factor of 5;

(3) Fastened by babbitted tapered elevator sockets or other acceptable methods. If cable clamps are used, a minimum of 3 fist grip or equivalent clamps shall be provided. U-shaped clamps shall not be acceptable.