Free PDF Diagram:
Fire Alarm System Class A Wiring
See how to wire a fire alarm system using Class A Wiring.
See how the Class A Wiring changes to 2 Class B Circuits when a wire breaks.
Class A Wiring is an automatic safety backup for the building fire alarm system wiring. Under normal circumstances, all devices are connected to the fire alarm panel. With Class A Wiring, when a single wire breaks, all of the devices are still connected to the fire alarm panel.
The Diagram Shows: