Battery Backup Emergency Lighting
Battery backup emergency lights are hard-wired fixtures equipped with an internal rechargeable battery system that automatically activates during a power outage. These units provide a minimum of 90 minutes of illumination, ensuring safe visibility for building occupants to navigate exit routes and comply with emergency egress codes such as UL 924 and NFPA 101.
Exit Sign Battery Backup – Frequently Asked Questions
1. What is a battery backup exit sign?
A battery backup exit sign is a hard-wired fixture equipped with an internal rechargeable battery. In the event of a power outage, the battery automatically provides illumination for at least 90 minutes to maintain visibility of exit routes.
2. How long does the battery last during an outage?
By code, the battery must power the exit sign for a minimum of 90 minutes during a power failure, per UL 924 and NFPA 101 standards.
3. How often should the battery be tested?
Most codes require a monthly 30-second test and an annual 90-minute test to ensure the battery and indicator lights function correctly. Many signs include a test button and LED status indicator to simplify this process.
4. How long do exit sign batteries last before needing replacement?
Typical battery lifespan ranges from 3 to 5 years, depending on usage conditions and battery type. Signs will often display a charging or fault indicator when replacement is needed.
5. What types of batteries are used in exit signs?
Common battery types include nickel-cadmium (Ni-Cd), nickel-metal hydride (NiMH), or sealed lead-acid (SLA). LED exit signs typically use compact, long-life battery packs compatible with low power draw.
6. Do battery backup exit signs need to be connected to power?
Yes. These signs are hard-wired to building power for normal operation and battery charging. The battery only activates when power is lost.
7. Can battery backup exit signs be used outdoors?
Only if they are rated for damp or wet locations. Look for models with weatherproof housings and appropriate IP ratings if outdoor use is required.
8. What maintenance is required?
Routine monthly and annual testing, periodic visual inspection, and battery replacement every few years as needed. Some jurisdictions require documentation of testing.
9. How do I know if the battery is working?
Most modern exit signs have LED indicators. A green light typically means normal operation; a red or flashing light may signal a battery issue or failed test.
10. Are battery backup signs required in all buildings?
Yes, in most commercial, industrial, and institutional buildings. Compliance is governed by local building codes, OSHA, IBC, and NFPA standards.