30 C.F.R. § 77.1436 – Drum end attachment.

(a) For drum end attachment, wire rope shall be attached—
1. (1) Securely by clips after making one full turn around the drum spoke;
2. (2) Securely by clips after making one full turn around the shaft, if the drum is fixed to the shaft; or
3. (3) By properly assembled anchor bolts, clamps, or wedges, provided that the attachment is a design feature of the hoist drum. Design feature means either the manufacturer's original design or a design approved by a registered professional engineer.
(b) A minimum of three full turns of wire rope shall be on the drum when the rope is extended to its maximum working length.