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What could cause surges in a normal power line?

Issue:

What could cause surges in a normal power line?

Product Line:

All

Environment:

All models, All Serial Numbers

Cause:

Function of ultility power.

Resolution:
The surges could be classified in two: surges could be external the building and could be internal the building. Frequently external surges are caused by storms and / or by power company switching operations. When equipment within the building is turning on and off Internal surges could occur.
Generally external surges could be more severe than internal surges while internal surges could occur more frequently, around 80% of all surges are internal.