DALI-2 Part 202: Function Tests, Duration Tests and Commissioning Traps

Short answer: IEC 62386-202 (DALI Part 202, device type 1) standardises how a self-contained emergency luminaire with a DALI interface runs its function and duration tests and reports the results over the two-wire DALI bus. It automates the testing and the audit trail — but it does not replace the responsible person who reviews failures and fixes fittings.

1. What Part 202 actually covers

Part 202 applies to control gear for self-contained emergency lighting, where the battery and control gear sit in or next to the luminaire. The current edition is IEC 62386-202:2022 (published as BS EN IEC 62386-202 in Europe). It builds on IEC 62386-101/102 for the general DALI protocol and references IEC 61347-2-7 for the safety of the emergency controlgear, and EN 60598-2-22 for the luminaire. Each fitting has its own address on the bus, so faults can be located to a specific unit.

The standard describes operating modes including normal, emergency, rest, inhibit and extended emergency mode. Rest mode switches the lamp off while on battery to conserve energy during a long building closure; inhibit mode prevents the fitting entering emergency mode during commissioning.

2. Function test vs duration test

• Function test: a short check — typically seconds — that verifies the lamp, the battery connection and the changeover and charging circuits.
• Duration test: simulates a real mains failure and runs the lamp from battery for the full rated duration (commonly 1 or 3 hours), confirming the battery can still deliver its declared capacity.

National rules set the frequency. Under BS 5266-1 and the EN 50172 framework, function tests are monthly and full-duration tests annual, with results recorded in a logbook. The DALI application controller can trigger tests by command, or the gear can run them on an internal schedule; the standard defines default intervals (7 days for function tests, 26 weeks for duration tests) and a test execution timeout to detect a delayed or missed test.

3. How the result comes back over the bus

After a test, the gear updates emergencyStatus and emergencyFailureStatus. Flags can indicate battery failure, lamp failure, circuit faults or a test that timed out. Controllers use QUERY FAILURE STATUS and QUERY EMERGENCY STATUS, and QUERY DURATION TEST RESULT returns the elapsed time during a duration test in 2-minute increments. An extended duration function allows commissioning teams to run a longer ageing test, or to discharge until the lamp cut-off voltage to measure real capacity. An application controller should check the "test done" and "valid" status bits before reading failure flags, so an aborted test is not logged as a pass.

4. Four commissioning traps

• Discharged batteries during construction. Set the installation inhibit timer so frequent power cycling on site does not drain new batteries before handover.
• Duration tests too soon. A duration test fully discharges the battery, and emergency gear normally refuses to start one before the battery has completed a full charge cycle (often around 24 hours). Schedule accordingly.
• All fittings testing at once. Stagger duration tests by zone so an escape route is never left unprotected and the building is not dark on battery at one time.
• Treating automation as compliance. Self-test produces data; a qualified person must still review the report, replace failed batteries and record the corrective action in the logbook.

5. DALI-2, standalone self-test or manual?

• Manual key switch: lowest hardware cost, highest labour cost, and the logbook depends on someone walking the building with a ladder.
• Standalone self-test fitting: runs its own monthly and annual tests and signals faults with an LED; no extra wiring, but someone still has to walk past to read the indicator.
• DALI-2 Part 202 / addressable: central scheduling, staggered tests, per-fitting pass/fail logging and integration with a BMS. Best for large sites and retrofit projects where access is difficult, but needs a bus, a controller and commissioning expertise.
• Wireless self-test: useful where new bus cabling is impractical; check that the reporting and log export meet the local inspection requirements.

6. What to put in the specification

• Whether the emergency gear must conform to IEC 62386-202 (DALI-2 device type 1) and carry the corresponding certification — ask for evidence for the exact SKU.
• Who supplies the application controller, and whether it supports automated function and duration tests with time-stamped logs.
• The rated duration and the test schedule required by the local code, plus a staggered test plan.
• Commissioning requirements: inhibit timer, full charge before the first duration test, and handover of the test records.

For projects without a DALI bus, a standalone self-test fitting with a clear indicator and a documented walk-through schedule is usually the more practical choice. Specify the test capability you actually need, not the longest feature list.

Quick answers

Is DALI-2 emergency gear mandatory?

No. Codes require testing and records; central monitoring is one way to achieve them. Standalone self-test and manual testing remain valid where the local code and site size allow.

Does a self-test fitting remove the logbook?

No. Automated tests still require review, corrective action and a retained record. Self-testing automates the test execution, not the maintenance response.

Can a duration test run immediately after installation?

Usually not. The battery needs a complete charge cycle first, and the installation inhibit timer should be managed during commissioning to avoid premature discharge.

About Anshine — JiangMen Anshine Technology Co., Ltd. is a Jiangmen, Guangdong-based manufacturer of LED emergency luminaires, exit signs and emergency power supplies for B2B buyers. The company was registered in 2025; our founding team has about 20 years of experience in the emergency lighting industry. To request documentation for a specific model, use the enquiry form on this website.

Standards and transport rules change. This article is general buying guidance, not a declaration of conformity or legal advice. Verify the current edition of each standard, the applicable national annex and the requirements of the authority having jurisdiction, and always request SKU-specific documents before placing an order.