30 CFR 57.19021 - Minimum rope strength.
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:
For rope lengths less than 3,000 feet: Minimum Value=Static Load×(7.0−0.001L)
For rope lengths 3,000 feet or greater: Minimum Value=Static Load×4.0.
For rope lengths less than 4,000 feet: Minimum Value=Static Load×(7.0−0.0005L)
For rope lengths 4,000 feet or greater: Minimum Value=Static Load×5.0.
Minimum Value=Weight of Rope×7.0
Title 30 published on 2013-07-01
no entries appear in the Federal Register after this date.