3. Time switch

(a) A time switch must be—

(i) capable of switching on and off electric power at variable pre-programmed times and on variable pre-programmed days; and
(ii) configured so that the lights are switched off at any time the space is designated to be unoccupied.

(b) A time switch for internal lighting must be capable of being overridden by—

(i) a means of turning the lights on, either by—

(A) a manual switch, remote control or an occupant sensing device that on sensing a person’s presence, overrides the time switch for a period of up to 2 hours, after which if there is no further presence detected, the time switch must resume control; or
(B) an occupant sensing device that overrides the time switch upon a person’s entry and returns control to the time switch upon the person’s exiting, such as a security card reader or remote control; and

(ii) a manual “off” switch.

(c) A time switch for external lighting must be—

(i) configured to limit the period the system is switched on to between 30 minutes before sunset and 30 minutes after sunrise is determined or detected including any pre-programmed period between these times; and
(ii) capable of being overridden by a manual switch, remote control or a security access system for a period of up to 8 hours, after which the time switch must resume control.

(d) A time switch for boiling water or chilled water storage units must be capable of being overridden by a manual switch or a security access system that senses a person’s presence, overrides for a period of up to 2 hours, after which if there is no further presence detected, the time switch must resume control.