Oil-filled capacitors are encased in metal and are filled with a dielectric fluid. They can be operated upto 100 degrees C however 90 degrees C is the common rating. Most of the oil-filled capacitors manufactured by GE and others have two 1/4” spade terminal lugs on the top of the capacitor for the connection point. When replacing a new capacitor please make sure to not cut the terminal leads attached to the wires coming from the ballast. These terminals will need to be reused to attach to the new capacitor. These capacitors are extremely reliable and can come in voltage ratings upto 525V.
With HID lamps operating on lag and HX type ballasts, capacitors are needed to increase (input) power factor. When doing so the number of lamps that can be used or operated on a particular circuit can nearly double. In fact in instances where a large number of lamps and ballasts are used, power factor correction is also needed to avoid problems with power quality and penalties from utility companies. Capacitors are a main component of a CWA and regulated lag circuit system. These systems will not operate without capacitors in line. Oil-filled (wet) and dry-film capacitors are commonly used with all types of ballasts technologies. Note: As a safety requirement, there must be a means to discharge capacitors after power is turned off .