What Is Inside a Ballast

They’re usually rectangular black boxes with wires coming out of one or both ends. Lighting ballasts for fluorescent light bulbs and HID lamps made before 1980 may contain polychlorinated biphenyls (PCBs). … Fortunately, you can easily tell whether a ballast contains PCBs.

What else can a ballast be used for?

In a fluorescent lighting system, the ballast regulates the current to the lamps and provides sufficient voltage to start the lamps. Without a ballast to limit its current, a fluorescent lamp connected directly to a high voltage power source would rapidly and uncontrollably increase its current draw.

How do I know if a ballast has PCBs?

Ballasts manufactured between 1979 and 1998 that do not contain PCBs are labeled “No PCBs” If a ballast is not labeled “No PCBs”, it is best to assume it contains PCBs. If the ballast does contain PCBs, they are located inside the small capacitor or in the surrounding potting material.