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How Surge Protectors Work Like water, electricity flows from areas of high pressure to areas of low pressure. The electrical difference in this pressure running through a wire is measured in voltage. When voltage increases above the norm for at least three nanoseconds, it is called a surge. If the surge is too great, it can burn wire rendering it useless. A surge protector detects excess voltage and diverts it to a grounding wire. All surge protectors must be plugged int …