3.2.7.4.Emergency Power for Lighting

(1) An emergency power supply shall be (a) provided to maintain the emergency lighting required by this Subsection from a power source such as batteries or generators that will continue to supply power in the event that the regular power supply to the building is interrupted, and (b) so designed and installed that upon failure of the regular power it will assume the electrical load automatically for a period of (i) 2 h for a building within the scope of Subsection 3.2.6., (ii) 1 h for a building of Group B major occupancy classification that is not within the scope of Subsection 3.2.6., (ii.1) 1 h for a building that contains a Group C major occupancy retirement home and that is not within the scope of Subsection 3.2.6., (iii) 1 h for a building within the scope of Article 3.2.2.51. or 3.2.2.60, and (iv) 30 min for a building of any other occupancy. (See Note A-3.2.7.4.(1)) (2) If self-contained emergency lighting units are used, they shall conform to CSA C22.2 No. 141, “Emergency lighting equipment.”