Fluorescent ballasts for all indoor applications must be typed Class P. these ballasts contain internal Thermal NEC. 410.130 (E)protection to protect against overheating.
Ballast - A device required by discharge light sources such as fluorescent and HID lamps to regulate the voltage and current supplied to the lamp during startup and operation.
Each family also has two types of ballasts: magnetic ballasts and electronic ballasts. Magnetic ballast is an older ballast technology. For the fluorescent lamp family, both linear T12 fluorescent lamps and 2-pole CFLs use magnetic ballasts. For HID, some metal halide and his HPS lamps use magnetic ballasts.
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