Mich. Admin. Code R. 408.7099 - Hoisting cables
Rule 99.
(1)
Only iron, low carbon steel, or steel wire cables with fibre cores, having the
commercial classification "elevator wire cable," shall be used for suspension
of an elevator car and counterweights. The wire material for a cable shall be
manufactured by the open-hearth or electric furnace process or their
equivalent.
(2) Suspension means
shall be not less than 2 iron or steel wire cables having a diameter of not
less than 1/4 inch.
(3) The factor
of safety of the suspension means shall be not less than 7.
(4) The arc of contact of a wire rope on a
traction sheave shall be sufficient to produce adequate traction under all load
conditions.
(5) A wire rope
anchored to a winding drum shall have not less than 1 full turn of rope on the
drum when the car or counterweight has reached its limit of possible
overtravel.
(6) A car or
counterweight wire rope shall not be lengthened or repaired by
splicing.
(7) The winding-drum end
of a car and counterweight wire rope shall be secured by a clamp on the inside
of the drum.
(8) The car or
counterweight end of a wire rope shall be fastened by return loop, by
individual tapered babbitted sockets, or by an alternate method approved by the
board. A clamp of the U-bolt type shall not be used.
Notes
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