30 CFR § 56.19024
Unless damage or deterioration is removed by cutoff, wire ropes shall be
removed from service when any of the following conditions occurs:
(a) The number of broken wires within a rope lay length, excluding
filler wires, exceeds either
(a)(1) Five percent of the total number of wires; or
(a)(2) Fifteen percent of the total number of wires within
(b) On a regular lay rope, more than one broken wire in the valley
between strands in one rope lay length.
(c) A loss of more than one-third of the original diameter of the
(d) Rope deterioriation from corrosion.
(e) Distortion of the rope structure.
(f) Heat damage from any source.
(g) Diameter reduction due to wear that exceeds six percent of the
baseline diameter measurement.
(h) Loss of more than ten percent of rope strength as determined by