Can a ballast regulate dirty power for 60 Hz?

• A. Yes
• B. No
• C. Sometimes
• D. Only with a Special Model

Answer: (B)

Ballasts regulate current to the lamp, not the quality of the incoming power. Their job is to limit the arc current and provide the proper starting and operating conditions for the lamp at its intended frequency. Dirty power—voltage sags, spikes, harmonics, and transients—is a power-quality issue that ballast devices do not actively fix or “clean.” While some electronic ballasts may include EMI filters or slight efficiency improvements, they are not meant to act as power-conditioners to produce a clean 60 Hz waveform. If clean power is required, a separate power conditioning solution (like a line conditioner, harmonic filter, surge protector with conditioning, or UPS) is needed. So a ballast cannot regulate dirty power for 60 Hz.