Testing emergency lights takes a 30-second monthly check and a 90-minute annual full-duration test, plus a written record each time.
When a storm knocks out the power, a battery emergency light that has never been tested often dies right when it matters most. The practical answer to how to test emergency lighting is a simple rhythm: a short monthly button test, one long annual discharge test, and a paper trail that proves both happened.
Testing Emergency Lights: The Schedules And The Rules
Emergency lighting depends on two separate tests on different timers. A monthly functional test catches lamps and batteries that fail quickly, while an annual duration test proves the unit can carry a full evacuation load.
US life-safety compliance follows the schedule laid out in NFPA 101, the Life Safety Code. NFPA 101’s testing requirements apply to battery-powered emergency lights and exit signs, and they set the baseline that most local authorities adopt.
| Requirement | Monthly Test | Annual Test |
|---|---|---|
| How often | Every 30 days | Once per year |
| How long to run | At least 30 seconds | At least 90 minutes |
| How to start it | Press the test button | Switch off the circuit or simulate power loss |
| What counts as passing | Lamp stays on for 30 seconds | Light stays on the full 90 minutes |
| Record needed | Yes | Yes |
Each test requires the equipment to stay fully operational for its entire duration. If it drops out early, the unit has failed and needs service before it can be returned to service.
How To Run The Monthly And Annual Test
The physical test procedures are almost identical, differing only in duration and the way you interrupt normal power.
Monthly test: use the button
Most self-contained units include a test button that disconnects the normal power feed and forces the unit onto battery. Press and hold it for at least 30 seconds while you watch the lamps. The exit sign should stay lit and the lamp should hold a steady glow with no flicker.
While it is running, look for the warning signs maintenance crews usually miss: cracked lenses, loose mounting, or a charger indicator that failed to come back on afterward. When the 30 seconds are up, release the button and confirm the unit returns to its charging mode.
Annual test: simulate the outage
The full 90-minute test puts the unit through a complete power failure, which means you actually need to de-energize the circuit that feeds it. Flip the breaker or unplug the unit, then let it run for a full hour and a half.
Some facilities do this after hours because normal lighting in that area will stay off during the test. Walk through the space every 15 to 30 minutes to confirm the lamps are still burning; a light that fails at minute 40 has failed the test, and the clock does not restart.
At the end of the test, restore power and verify the charging indicator comes on. An annual test that drains the battery without recharging afterward leaves the unit dead for the next emergency.
Paperwork And Failed Units: What Happens After The Test
Written records are not optional under NFPA 101; the authority having jurisdiction can ask to see them at any inspection. Each entry should list the unit’s location or ID, the date, the tester’s name, and a pass or fail result for both the 30-second and 90-minute runs.
How long those records must be kept varies by jurisdiction.
A unit that fails its annual test cannot go back into service until the defect is fixed and the light passes a retest. If the fixture is old and the repair cost is not worth it, replacing it is usually the faster route; our tested picks for best battery emergency lights will help you choose a model that clears the next inspection.
FAQs
Do exit signs need the same tests as emergency lights?
Yes when the sign has its own battery. Self-contained exit signs follow the same 30-second monthly test and 90-minute annual test as emergency light units. Hardwired signs that rely on a central generator or battery system fall under that system’s testing schedule instead.
What is the difference between a 30-second test and a 90-minute test?
The 30-second monthly check proves the lamp, battery connection, and transfer switch still work. It is not a substitute for the annual test. The 90-minute test proves the battery can sustain an actual evacuation, which is the real-world requirement occupants depend on during a long outage.
I found an emergency light with no test button. How do I test it?
Use the breaker that feeds the unit. Switching off the circuit simulates a power failure, and the unit should switch to battery mode on its own. That method works for both the monthly and annual tests, though it takes longer to reset if other lights share the circuit.
References & Sources
- NFPA. “NFPA 101: Emergency Lighting Requirements.” Source for the 30-day interval, 30-second minimum, 90-minute annual test, and written record requirement.
