Central battery inverter wiring should be of enhanced grade (BS 5839-1); units should be connected to the secondary supply and energise all connected escape lighting and signs within 5 s (BS 5266), and have maintenance bypass switches that isolate charger and batteries while keeping the output supplied. Every theatre needs a dedicated inverter battery unit, sited outside the theatre and serving only its operating lamps.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.