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Power Event Definitions, Causes and Effects
Sags:Also known as brownouts, sags are short term decreases in voltage levels. This is the most common power problem, accounting for 87% of all power disturbances according to a study by Bell Labs.

Blackout:Total loss of utility power.

Spike:Also referred to as an impulse, a spike is an instantaneous, dramatic increase in voltage. Akin to the force of a tidal wave, a spike can enter electronic equipment through AC, network, serial or phone lines and damage or completely destroy components.

Surge:A short term increase in voltage, typically lasting at least 1/120 of a second.

Noise:More technically referred to as Electro-Magnetic Interference (EMI) and Radio Frequency Interference (RFI), electrical noise disrupts the smooth sine wave one expects from utility power.

Battery BackupsUPS Backup solutions solve bad power problems:

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