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Fluorescent Emergency Ballasts

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Fluorescent emergency ballasts are self-contained backup power units that install inside a standard fluorescent fixture and automatically switch the lamps to battery power when normal electrical power is interrupted. This allows the fixture to continue providing illumination during a power outage, fulfilling the life-safety egress lighting requirements set by the National Electrical Code (NEC), NFPA 101, and local building codes for commercial and institutional occupancies.

Emergency ballasts are installed alongside the existing fluorescent ballast in the fixture and connect to one or two lamps. During normal operation, the emergency ballast continuously charges its internal nickel-cadmium or sealed lead-acid battery while remaining invisible to building occupants. When power fails, it activates within fractions of a second and maintains illumination at the code-required level for a minimum of 90 minutes, typically at least 1 foot-candle along the path of egress. Self-diagnostic units with LED test indicators simplify the required periodic testing.

RelightDepot carries UL-listed fluorescent emergency ballasts compatible with the most common commercial fluorescent lamp types. For the primary ballasts that emergency units complement, browse our T8 Ballasts and T5 and T5HO Ballasts categories. All fluorescent ballast types including emergency units are available in our Fluorescent Ballasts parent section. For facilities transitioning egress lighting to LED, our LED Drivers section includes compatible LED emergency driver options.