(1) Every landing gate or door shall be fitted with locking device which shall comply with the following requirements, unless otherwise permitted in writing by the Chief Inspector:
(i) Suitable means shall be provided so that it shall not be possible to open the gate or door from the landing side unless the Lift car is in the landing zone pertaining thereto. Provision shall be made so that landing gate or door may be opened in case ofemergency or for inspection by the Inspector or by any authorized person, by means of a special key or other suitable device, irrespective ofthe position of the Lift car.
(ii) No Lift car shall be started or kept in motion, unless all landing gates or doors pertaining to the Lift are in the closed position.
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(iii) The electrical and mechanical parts of all locking devices for gates or doors, shall be sufficiently strong so that reasonable wear may not cause an unsafe condition.
(iv) Every electro-mechanical lock shall be suitably encased and removal of any detachable cover fitted to such casing must not effect operation ofthe locking device. Where springs are used in locking devices, they shall be of compression type only and properly supported.
(v) The contacts of locking device for landing gates or doors shall be opened positively.
(vi) The locking device for landing doors shall be so designed that the lock contact is not closed until the door is closed, and the circuit shall not be completed until the leading edge ofthe door is within 5 millimeters ofthe nearest face ofthe door-jamb or when the leading edges ofthe center opening doors are within 5 millimeters contact of each other:
Provided that locking device shall not prevent the operation of the Lift whilst the emergency release push is in temporary use, or when the Lift car is being moved under the control of the leveling device.
(vii) Contact shall be of solid type pivoted, hinged on sliding and of sturdy construction.
Provision shall be made on Lift operated from the car and landing to prevent the opening ofany landing door when the car is passing that zone in response to a call from another landing;
(viii) The levers operating the mechanical part ofthe locking device shall be protected from interference from the landing side ofthe Lift enclosure.
(ix) Locking devices used with multiple panel doors shall lock all panels of the doors or only one panel provided that the interconnecting mechanism of door panels is so arranged that the locking of one will prevent the movement of all panels, notwithstanding the breakage of chain or rope used for interlocking the panels.
(x) When a door locking device is used on one panel ofvertically bi-parting landing door reliance shall not be presses on gravity to keep the other panel closed.