(1) Every electric Lift shall be provided with upper and lower normal terminal limit switches arranged to stop the car automatically within the limits of top car clearance and bottom run by (over travel) from any speed attained in normal operation. Such limit switches shall act independently ofthe operating device, the ultimate or final limit switch and the buffers.
(2) Normal terminal limit switch shall be fitted in the Lift car or in the Lift well or in the machine room, and such switches shall be brought into operation by the movement of the Lift car.
(3) When terminal limit switches are situated in the machine room, they shall be mounted on and operated by stopping device mechanically connected to and driven by the Lift car without :friction. An automatic safety switch shall be provided to stop the Machine in case of failure oftape, chain, rope or other similar device.
(4) Electric Lifts shall be provided with ultimate or final limit switches arranged to stop the car automatically within the top and bottom clearances independent of the normal operating device and the terminal limit switches. The switches and the oil buffer shall be so arranged that the opening ofthe switch and the engagement ofthe buffer shall be as nearly simultaneous as possible. When spring buffers are employed, the switch shall open before the buffers are engaged.
(5) Final limit switches shall act to prevent movement ofthe Lift car under power in both directions oftravel and shall after operation, remain open until the car has been moved by a winding to a position within the limits of nonnal travel.
(6) Final limit switches shall act to prevent movement ofthe Lift car and shall be operated by the movement of the Lift car in the Lift well,
(7) Final limit switches shall not control the same switches on the controller as those controlled by the normal terminal limit switches unless two or more separate and independent switches are provided.
(8) All normal terminal stopping switches whethermounted on the Lift car or in the Lift well shall be ofenclosed type and shall be securely mounted. The contacts ofall terminal stopping devices shall be opened positively and mechanically by the movement ofthe Lift car.
Note:- In the case of electric Lift usingfloor controller or other similar devicesfor automatic stopping at the floor landingonly one set offloor stopping contacts shall be necessaryfor each terminal landingprovidedthese contacts and the means ofoperating them comply with the requirementsfor terminal stopping devices.