{"data":{"id":"us/30-cfr-75.1431","jurisdiction":"us","citation":"30 CFR 75.1431","heading":"Minimum rope strength.","body":"At installation, the nominal strength (manufacturer's published catalog strength) of wire ropes used for hoisting shall meet the minimum rope strength values obtained by the following formulas in which “L” equals the maximum suspended rope length in feet:\n(a) Winding drum ropes (all constructions, including rotation resistant).\nFor rope lengths less than 3,000 feet:\nMinimum Value = Static Load × (7.0−0.001L)\nFor rope lengths 3,000 feet or greater:\nMinimum Value = Static Load × 4.0\n(b) Friction drum ropes.\nFor rope lengths less than 4,000 feet:\nMinimum Value = Static Load × (7.0 − 0.0005L)\nFor rope lengths 4,000 feet or greater:\nMinimum Value = Static Load × 5.0\n(c) Tail ropes (balance ropes).\nMinimum Value = Weight of Rope × 7.0","path":["Title 30—Mineral Resources","CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR","SUBCHAPTER O—COAL MINE SAFETY AND HEALTH","PART 75—MANDATORY SAFETY STANDARDS—UNDERGROUND COAL MINES","Subpart O—Hoisting and Mantrips"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-30.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:25:24Z","sha256":"e0d8e6f20d6af9174a0790c407d400ea3f5c28926801a065a9efdce33bc05afb","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-75.1430","next":"us/30-cfr-75.1432"},"notice":"GroundRules: Original legal text. Not legal advice."}