AS 1668.1 systems—S20C6(1)

S20C6(1) covers smoke detection associated with AS 1668.1 stair pressurisation systems referenced in Part E2. It requires the installation of additional detectors adjacent to each bank of lift landing doors. Lift shafts form one of the principal paths for smoke spreading between floors in a multi-compartmented building.

Location and sensitivity—S20C6(2) and (3)

S20C6(2) and (3) cover the location and sensitivity of smoke detectors associated with smoke control systems referenced in:

• E2D16, E2D17 or E2D19, regarding automatic shutdown of air-handling systems.
• Specification 21, regarding the smoke exhaust system.

Activation—S20C6(4)

Under S20C6(4), smoke detectors which activate a smoke control system must:

• form part of the building’s AS 1670.1 smoke detection system or be a separate dedicated system; and
• activate a building occupant warning system complying with S20C7, unless they initiate shutdown of an automatic air- handling system only, in which case they need not activate a building occupant warning system.