(1) Chains shall not be used for the suspension ofa Lift. Not less than three independent suspension ropes shall be used for car or counterweight of any Lift with traction drive.
(2) In the case oftraction drive, the factor of safety shall be based on static contract load plus the weight of the Lift car and accessories. In case of drum type drives, the factor of safety shall be calculated with dynamic conditions.
Explanation: For the purposes of these Rules, the factor of safety shall be as under:
Fxnxk w Where F = minimum breaking strength of one rope, n = number of separate suspension ropes under load, k - roping factor, that is 1 for 1: 1, 2 for 2:1 roping and w = maximum static load imposed on all car ropes with the car and its rated load at any position in the Lift well in the same units as F
(3) The car and counterweight ends ofthe suspension ropes shall be fastened by spliced return loops or clipped return loops or individual tapered babbitted sockets. Loops shall not hold directly on their fixings, but shall be lined with proper thimble eyes or equal protection. In all cases the fastenings shall be capable ofsustaining a load not less than 80 percent ofthe minimum breaking strength ofthe suspension ropes;
(4) A data plate indicating the following shall be fixed on the cross head ofthe car frame :
(i) Diameter ofrope
(ii) Number of ropes, and
(iii) Manufacturer's rated breaking strength of rope in kilograms.
(5) All ropes anchored to awinding drum shall have not less than one complete and one halfturns ofthe ropes on the winding dram when the Lift car or counter weight as reached the extreme limit of its over travel.
(6) Every Lift car or counter weight rope shall be free from joints.
(7) Rope compensation shall be used for any travel but it shall be necessary for travels over 30 meters.
(8) The winding drum and the Lift car and counterweight suspension ropes shall be properly secured by clamps on the inside ofthe drum.
(9) Means shall beprovided for adjusting the lengths ofthe ropes to equalize the load on the individual suspension ropes.
THEKOLKATAGAZETTE,EXTRAORDINARY, NOVEMBER 11, 2022 25
(10) Thematerial, quality, construction, suspension ropes and the fixing ofropes shall, as far as possible, conform to Indian standards and methods pertaining to the same.
(11) Tensioning devices for compensation ropes, governor ropes and the like shall be protected against damage due to falling objects.
(12) Each suspension rope shall be separately and independently fixed to the car and to the counterweight. The simple suspension ofthe Lift car or the counter weight by means of a sheave or the like shall count as one suspension only.
(13) The minimum diameter ofropes for car and counterweight ofpassenger & goods Lifts shall be 8 mm.