The B33 emergency ballast works in conjunction with an INSTANT START, PARALLEL AC ballast to convert new or existing fluorescent fixtures into emergency lighting. The emergency ballast consists of a field-replaceable nickel-cadmium battery, charger and electronic
circuitry in one red case. The B33 can be used with two or three 32W (4 ft.) T8 fluorescent lamps or with two or three 39 W or two 40-55W (4-pin) long compact fluorescent lamps without integral starters. It is compatible ONLY with instant start, parallel two-, three- or four-lamp electronic or standard AC ballasts. If used in an emergency-only fixture, no AC ballast is necessary. The B33 is
suitable for indoor and damp locations. It is not suitable for air handling heated air outlets or wet or
hazardous locations. Recommended applications include: hospital surgical suites, areas along the path of egress
with high ceiling heights and health care, educational, commercial and institutional facilities needing higher levels of emergency illumination.