Engine 2014: Electricity

1. A Inputs "1", "2", and "3" represent fire/smoke detectors or hand pull reporting stations and Input "4" represents an alarm acknowledgement switch.
2. B Inputs "1", "2", "3" represent fire/smoke detectors and Input "4" represents a hand pull reporting station.
3. C Input "4"  represents a fire/smoke detector and Inputs  "1", "2", "3" represent hand pull reporting stations.
4. D Inputs "1", "2", and "3" represent alarm acknowledgement station switches stations and Input "4" represents a fire/smoke detector or hand pull reporting station. .

Tip: press A-D to answer