Specification 24 Lift installations

This Specification contains requirements for electric passenger lift installations and electrohydraulic passenger lift installations.

(1) A lift car exposed to solar radiation directly, or indirectly by re-radiation, must have—

1. mechanical ventilation at a rate of one air change per minute; or
2. mechanical cooling.

(2) A 2 hour alternative power source for ventilation or mechanical cooling at (1) must be provided in the event of normal power loss.

A lift car must have an emergency lighting system designed—

1. to come on automatically upon failure of the normal lighting supply; and
2. to provide at least 20 lux of lighting for 2 hours on the alarm initiation button.

While a lift in a lift shaft is in service, the cooling of the lift shaft must—

1. ensure that the dry bulb air temperature in the lift shaft does not exceed 40°C; and
2. if the cooling is by a ventilation system, be provided with an air change rate determined using a temperature rise of no more than 5 K.

Where there is a security foyer in a building, access may be via locked security doors provided—

1. security doors revert to the unlocked state in the event of—
   1. power failure; or
   2. fire alarm; and
2. locked foyer areas are monitored by closed circuit television and intercom system to a 24 hour staffed location.

(1) Where a lift is installed in a single enclosed lift shaft having a distance between normal landing entrances greater than 12.2 m, emergency access doors must be provided and constructed as follows:

1. The clear opening size of emergency doors must be not less than 600 mm wide x 980 mm high.
2. Hinged doors must not open towards the interior of the lift shaft.
3. Doors must be self-closing and self-locking.
4. Doors must be marked on the landing side with the letters not less than 35 mm high:
   DANGER LIFTWELL ACCESS
   KEEP FURNITURE AND FIXTURES CLEAR
5. Doors from the landing side must only be openable by a tool.
6. Each emergency door must be provided with a positive breaking electrical contact, wired into the control circuit to prevent movement of the lift until the emergency door is both closed and locked.

(2) Emergency egress from the lift car must be provided in single enclosed lift shafts where—

1. ropes are installed; and
2. the vertical distance between the lift car sill and the landing door head is less than 600 mm; and
3. the counterweight is resting on its fully compressed buffer.

(3) Emergency egress required by (2) must be in the form of an interlocked door with clear opening dimensions not less than 600 mm x 600 mm, accessible from the lift car entrance or the lift car roof (where the door is located in the wall of the lift shaft).