Sags are much shorter in duration, lasting from a fraction of a second up to several seconds. Sags usually are caused by local conditions such as sudden current inrush when equipment is switched on. Common culprits are air conditioners, heaters, copy machines and laser printers, as well as large power amplification and lighting systems. Low voltage conditions can degrade the performance of audio equipment, cause erratic performance, corrupt digital data or cause data loss, and in some cases cause a unit to stop functioning completely. It is a relatively short duration event involving an increase above nominal voltage over a period of several cycles.
Surges often result from removal of large loads from a circuit.
Sustained overvoltage conditions are rare when using public utility power in a properly wired facility. Furman makes a variety of time-tested, reliable AC Line Voltage Regulators to stabilize all types of voltage fluctuations. Models vary according to the desired line voltage output, the range of allowable input voltages, the maximum current, and the type of outlet connectors supplied. Prices shown are Manufacturer's Suggested List Prices for the USA only. Actual selling prices are determined by individual retailers.