What Happens During Fire System Testing & Commissioning?

Testing and commissioning (T&C) is the systematic process of verifying that a fire safety system — once installed — functions exactly as designed and fully meets regulatory requirements. It is a distinct and critical phase of every fire safety project, and the final technical gate before QCDD witness testing and occupancy certification.

Understanding what happens during testing and commissioning helps building owners and project managers set realistic expectations, plan their schedules, and ensure they have the right people available at the right times.

Stage 1: Pre-Commissioning Checks

Before systematic testing begins, the commissioning engineer conducts a comprehensive visual inspection of the entire installation. This covers correct device placement and orientation, cable installation quality, panel configuration, and physical integrity of all components. Deficiencies found at this stage are logged and must be rectified before testing proceeds.

This stage also includes verification that all as-installed drawings are up to date and that any variations from the approved QCDD design are properly documented and, where required, approved.

Stage 2: Power-Up and Initial Configuration

The fire alarm panel is powered up and initially configured. Addressable system software is loaded and verified. Each device on the loop is identified and confirmed against the device schedule. Any devices not communicating correctly are investigated and corrected.

Fire suppression system controllers, gas detection panels, and integrated systems are also powered up and initial configuration is verified at this stage.

Stage 3: Device-Level Testing

Every device in the system is individually tested. For fire alarm systems, this means activating each smoke detector, heat detector, multi-sensor device, and manual call point and verifying that the correct alarm signal is received at the panel with the correct device identification and location.

Sounders and beacons are tested for correct operation and audibility/visibility levels. Emergency voice communication systems are tested for intelligibility. Suppression system nozzles and detection devices are verified for correct placement and operation.

Stage 4: Cause-and-Effect Testing

Cause-and-effect testing is one of the most technically demanding stages of commissioning. It verifies that when specific alarm conditions occur, all the correct downstream responses are triggered: door releases, ventilation changes, lift recall, pump start signals, fire shutters, emergency broadcast messages, BMS notifications, and so on.

Every cause-and-effect scenario documented in the approved matrix must be tested and confirmed. In a complex building, this can involve hundreds of test scenarios. The results are documented in detail, forming a core part of the commissioning record.

Stage 5: Fire Fighting System Testing

Sprinkler systems, fire hydrant risers, and hose reel systems are pressure tested to confirm hydraulic integrity. Fire pump sets are run-tested under load conditions, with flow and pressure readings verified against design specifications. Jockey pump cycling and automatic pump start sequences are tested.

Where a suppression system is installed, the agent delivery system is tested using simulated discharge sequences (without releasing agent) to verify detection, pre-discharge alarm, and abort sequences.

Stage 6: Integrated System Testing

Once all individual systems have been verified, integrated system testing confirms that all systems work together as designed. This includes confirming that fire alarm activation triggers the correct responses across all connected systems simultaneously.

Stage 7: QCDD Witness Testing

When the commissioning team is satisfied that all systems are performing correctly, the QCDD inspection is arranged. QCDD officers will witness a representative selection of tests, reviewing the commissioning documentation and verifying system performance in person. Any deficiencies identified by QCDD must be rectified and re-tested before final sign-off is granted.

AG FAFFCO coordinates and manages the entire QCDD witness testing process, ensuring full documentation is prepared and the inspection runs as efficiently as possible.