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:
(a) Winding drum ropes (all constructions, including rotation resistant). For rope lengths less than 3,000 feet:
Minimum Value=Static Loadx(7.0-0.001L)For rope lengths 3,000 feet or greater:
Minimum Value=Static Loadx4.0
(b) Friction drum ropes. For rope lengths less than 4,000 feet:
Minimum Value=Static Loadx(7.0-0.0005L)For rope lengths 4,000 feet or greater:
Minimum Value=Static Loadx5.0
(c) Tail ropes (balance ropes). Minimum Value=Weight of Ropex7.0 [48 FR 53239, Nov. 25, 1983; 48 FR 54975, Dec. 8, 1983]