Provide infrared curtain unit. The

Provide infrared curtain unit. The device shall cause the car and landing doors to reverse automatically to the fully-open position should the unit be actuated while the doors are closing. Unit shall function at all times when the doors are not closed, irrespective of all other operating features. The leading edge of the unit shall have an approved black finish. Provide door "OPEN" and "CLOSE" buttons. When the door "OPEN" button is pressed and held, the doors, if in the open position, shall remain open and if the doors are closing, they shall stop, reverse and re-open. Momentary pressure of the door "CLOSE" button shall initiate the closing of the doors prior to the expiration of the normal door open time.Equip each landing door with interlocks that shall prevent operating of car until doors are locked in closed position. Interlocks shall prevent opening of door at landing from corridor side unless car is at rest at landing, in the leveling zone, or landing access switch is used. Provide tamperproof interlocks and lock both panels of doors together.Provide retiring cams or other devices for landing door interlocks securely fastened to cars and arranged to operate without objectionable noise and vibration.Landing door interlock shall not be accepted unless it has successfully met requirements of EN 81-71.Every landing door shall be provided with an effective locking device so that it shall not normally be possible to open the door from the landing side unless the lift car door is in that particular landing zone.It shall not be possible under normal operation to start the lift car or keep it in motion unless all landing doors are in the closed position and locked.All door locking devices and door switches, together with any associated actuating rods, levers or contacts, shall be so situated or protected as to be reasonably inaccessible from the landing or the car.Every car door shall be provided with an electrical switch which will prevent the lift car from being started or kept in motion unless all car doors are closed. A mechanical locking device shall also be provided such that the car door cannot be opened from the inside while the car is outside the unlocking zone.3.6.LIFT MACHINE3.6.1.DRIVE OF THE CAR AND COUNTERWEIGHT / BALANCING WEIGHTGearless type drive with traction (sheaves and ropes) and brake drum mounted directly on the motor shaftThe motor shall be designed for elevator service3.6.2.PROTECTION FOR TRACTION SHEAVES AND PULLEYSFor traction sheaves and pulleys, provisions shall be made to avoid:Bodily injury,The ropes leaving the pulleys, if slack,