§77.1431. Minimum rope strength.
30 C.F.R. § 77.1431
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:
Winding drum ropes— (all constructions, including rotation resistant).
Friction drum ropes.
Tail ropes— (balance ropes).
Notes, amendments, and revision history
Amendments
[48 FR 53241, Nov. 25, 1983; 48 FR 54975, Dec. 8, 1983]
Authority
Authority: Sections 77.1430 through 77.1438 issued under sec. 101, Federal Mine Safety and Health Act of 1977, Pub. L. 91-173 as amended by Pub. L. 95-164, 91 Stat. 1291 (30 U.S.C. 811).
Source
Source: Sections 77.1430 through 77.1438 appear at 48 FR 53241, Nov. 25, 1983, unless otherwise noted.
Authority
Authority: 30 U.S.C. 811.
Source
Source: 36 FR 9364, May 22, 1971, unless otherwise noted.
Amendments
[48 FR 53241, Nov. 25, 1983; 48 FR 54975, Dec. 8, 1983]