12.3.4.7.

(1) Except as provided in Sentence (2), Articles 12.3.4.7. to 12.3.4.11. apply to,

(a) interior spaces of a building,

(b) exterior building features, including facades, illuminated roofs, architectural features, entrances, exits, loading docks and illuminated canopies, and

(c) exterior building ground lighting provided through the building’s electrical service.

(2) Articles 12.3.4.7. to 12.3.4.11. do not apply to emergency lighting that is automatically turned off during the normal use of the building.

(3) Fluorescent light ballasts shall meet or exceed the minimum ballast efficacy factors required by Supplementary Standard SB-10.

(4) Except as provided in Sentence (5), luminaires designed for use with one or three linear fluorescent lamps greater than 30 W each shall use two-lamp tandem-wired ballasts in place of single-lamp ballasts when two or more luminaires are in the same space and on the same control device.

(5) The tandem wiring required by Sentence (4) is not required for,

(a) recessed luminaires located more than 3 m apart, measured centre to centre,

(b) surface mounted or pendant luminaires that are not continuous,

(c) luminaires that use single-lamp high-frequency electronic ballasts,

(d) luminaires that use three-lamp high-frequency electronic or three-lamp electromagnetic ballasts, and

(e) luminaires on emergency circuits.