(I) Car and counter weight guide rails shall be of steel in all cases except where the nature ofthe processes carried on in the building render them unsuitable due to acid fumes for similar causes. In such cases prior approval ofthe Chieflnspector shall be obtained.
(2) Passenger and goods Lifts having rated speed ofmore than 0.50 meter per second, the car guide rail shall have their working surfaces machined.
(3) For passenger and goods Lifts having rated speed ofmore than 1.5 meter per second the counter weight guide rails shall have their surface machined.
(4) Round guide rails and cast iron guide rails shall not be used. 'T' section to be adopted shall be one of sizes specified in relevant Indian Standard or any other alternative section, provided they have adequate section modulus, moment of inertia and sectional area to withstand the forces resulting from the application of the car or counterweight safety devices.
(5) Guide rails shall be continuous throughout the entire length ofthe Lift well, and shall be so joined and fixed to their brackets which shall be of iron or steel so that the guide rails not deflect by more than 6 millimeters under round the clock operation. Wood blocks, plugs or similar methods shall not be used for fixing the guide brackets.
(6) Guide rails shall be ofsuch length that it shall not be possible for any other car or counterweight shoes to run off the guide rails.
(7) Guide rails and their fixings shall be so arranged to withstand the action of safety gear when stopping a counter weight or a fully loaded car.
(8) Guide rails shall be held to their fastening by clips ofsuch design that any rotarymovement ofthe clip will not release the guide rails.
18 THEKOLKATAGAZETIE,EXTRAORDINARY, NOVEMBER 11, 2022 [PARrI
(9) The clips used for fastening the guide rails shall be offorged steel, formed steel ormalleable iron ormachined mild steel. The fasteners used shall conform to the relevant Indian Standard.
(10) If the guides are attached to overhanging stairs, the method of fixing shall be such that no vertical stress is transferred from the guides to the stairs.
(11) Guide brackets and shims if any, shall be ofsteel and shall not be directly supported and fastened to the Lift well enclosure wall unless such wall is of such construction and strength so as to adequately withstand the thrust imposed on the guides under all conditions of the Lift service. The fastenings shall be by means of bond blocks built in to the wall or expansion bolts or through bolts with metal plates of such thickness and size so as to adequately distribute the load on the wall.