Q4
(a) Sketch a simplified circuit that may be incorporated in a control panel for an array of fire detectors.
(8)
(b) Describe the following features that may be found in a control panel for fire detectors:
(i) Audible fire alarm circuits.
(4)
(ii) Identification of zone of fire
(4)
(iii) Automatic change over from normal power supply
(4)
Reference Answer
### Part (a) Simplified Fire Detector Circuit A typical fire detector circuit is designed to be 'fully supervised', meaning it can differentiate between a normal state, a fire (alarm) state, and a fault state (e.g., a broken wire). This is achieved using an End-of-Line (EOL) resistor. **Circuit Components:** * **Control Panel:** The central processing unit containing monitoring logic, relays, power supplies, and indicators.
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