By definition, a voltage that is at least 10% above normal. (See Spike and Surge.)
An increase in voltage outside the normal voltage levels (10% or greater) for more than one minute.
A voltage greater than the rating of a device or component. Normally overvoltage refers to long term events (several AC cycles and longer). The term can also apply to transients and surges.
When used to describe a specific type of extended variation, overvoltage refers to a voltage having a value of at least 10% above the nominal voltage for any lasting period of time. This occurrence may last a few seconds, or several hours to a continuous condition depending on the site and prevailing conditions. Overvoltage differs from a surge because it's a condition of less severe voltage levels that lasts at minimum for several cycles.
Overvoltage is typically described as any voltage value of 10% above nominal for at least a minute.
A partial increase of AC line voltage, usually over 132V. Overvoltages can cause TVs and components to turn off if the voltage is too high. They can also cause slow electronic degradation. UPS Systems protect TVs and components against overvoltages.
A swell lasting more than one minute.
When the voltage in a circuit or part of it is raised above its upper design limit, this is known as overvoltage. The conditions may be hazardous. Depending on its duration, the overvoltage event can be permanent or transient, the latter case also being known as a voltage spike.