... certain loads,fiuorescent lights,motor speed controls,light dimmers.Over-Voltage:Long duration(milliseconds,seconds,minutes,hours or days)rise in ... sized utility oscillating between periods of brown -outs and over-voltage or accidental (e.g.accidental connection between two phases). ... to any piece of equipment connected to the incoming line,the telphone line itsdlf may even be damaged or destroted in ...