Do you experience Blackouts when your Emergency Lights & Exit Signs are tested?
If your site is experiencing this, then your site does not comply to AS2293.1 or AS2293.2.
There are many questions regarding Emergency Lighting & Exit Signage and whether these are required to have or not have a testing facility.
Well below are progressive extracts from AS2293.1 Part 1: System Design, Installation and Operation, i.e. performance requirements, and AS2293.2 Part 2: Routine Service & Maintenance.