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In the event of power supply failure in buildings that require two or more means of egress, an emergency electrical system shall automatically illuminate all of the following areas:
- Interior exit access stairways and ramps.
- Interior and exterior exit stairways and ramps.
- Exit passageways.
- Vestibules and areas on the level of discharge used for exit discharge in accordance with Section 1028.1.
- Exterior landings as required by Section 1010.1.6 for exit doorways that lead directly to the exit discharge.