17-27-132

parallel cathode preheating, <of a discharge lamp>

type of preheating of the electrodes of a discharge lamp in which the electrodes are fed by separate circuits

Note 1 to entry: Each electrode is usually connected across a low-voltage winding that can be part of the ballast and provides the preheating current. In certain circuits, this low voltage is automatically decreased after the arc has struck.

Note 2 to entry: This entry was numbered 845-07-73 in IEC 60050-845:1987.

Note 3 to entry: This entry was numbered 17-861 in CIE S 017:2011.

Publication date: 2020-12