There are several types of power problems. The standards define power problems under seven categories depending on their wave forms. They are as follows:
1. Transients
2. Interruptions
3. Sag / Under voltage
4. Swell / Overvoltage
5. Waveform distortion
6. Voltage fluctuations
7. Frequency variations
Learn more about these power problems at
The Seven Types of Power Problems
by APC
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