All cables must be installed in accordance with applicable national standards (e.g., BS 7671 and BS 5839-1). Fire resistant, screened cable should be used throughout. Mains wiring should be segregated from extra low voltage field wiring.

Mains Supply: Fixed wiring using 3 core cable (1mm² to 2.5mm²), fed from an isolating switched fused spur at 3A. The supply must be exclusive to the panel.

When testing with the lid open, always isolate Mains and disconnect batteries. Ensure end-of-line resistors are fitted in sounder and detector terminal blocks if testing before full installation.

Switch off the Mains. The BATTERY/POWER SUPPLY FAULT indicator should light and the beeper sound. Reconnect Mains; the panel should revert to normal. Disconnecting the battery should trigger similar fault indicators.

Short the sounder terminals 1&2. The SOUNDER FAULT indicator will light. Open circuit terminals 3&4 by disconnecting the end-of-line resistor; the fault indicator should also trigger.

Four conditions can exist:

• Normal Condition: Current flows via EOLD to monitor wiring.
• Open Circuit Fault: Wiring is broken; adjust potentiometer (VR1) if needed to fix zone voltage.
• Short Circuit Fault: Excessive current flow detected.
• Fire Condition: Triggered by detectors or manual call points (470 to 680Ω resistors).