Dedicated Branch Circuit and Secondary Power Schematic

The power path for a fire alarm control unit: a dedicated 20 A circuit breaker in the distribution panel on #12 AWG copper, an optional lockable disconnect, the battery charger and 24 VDC standby battery bank bonded to ground, and the supervised conditions reported to the panel (loss of AC, charger trouble, battery low or open and earth ground fault), with requirements and notes.