Modern electronic ballasts used in fluorescent lighting systems, as well as other digital switching devices, can generate harmonics in the electrical distribution system. There have been reported cases of such harmonics causing malfunctions in older control systems that communicate using power line carrier control (PLC) technology (such systems use the electrical distribution system as a means for inter-device communication by superimposing their digital "messages" over the 60 Hz power sine wave). Modern PLC systems that use spread spectrum technology are much more tolerant of harmonics, and encounter very few problems.

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