StacksVerified U.S. regulatory reference

30 CFR §77.1434

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Unless damage or deterioration is removed by cutoff, wire ropes shall be removed from service when any of the following conditions occurs:
  1. (a)The number of broken wires within a rope lay length, excluding filler wires, exceeds either—
    1. (1)Five percent of the total number of wires; or
    2. (2)Fifteen percent of the total number of wires within any strand;
  2. (b)On a regular lay rope, more than one broken wire in the valley between strands in one rope lay length;
  3. (c)A loss of more than one-third of the original diameter of the outer wires;
  4. (d)Rope deterioration from corrosion;
  5. (e)Distortion of the rope structure;
  6. (f)Heat damage from any source;
  7. (g)Diameter reduction due to wear that exceeds six percent of the baseline diameter measurement; or
  8. (h)Loss of more than ten percent of rope strength as determined by nondestructive testing.