Diagnosing voltage problems can be a difficult task, particularly if the problem only occurs sporadically.
Use a disturbance log to keep a record of your observations. The log will provide information that can be helpful if you need to contact a licensed electrician or work with one of our engineers after your power problem has been reported. For example, the log may help determine patterns during which the power disturbances occur, such as specific times of day, or the frequency of occurrences.
How to use the Disturbance Log
- Print a copy of the disturbance log*
- Each time you observe a power disturbance, jot down the date and time of the event.
- Check the boxes that best describe what happened.
- What else was happening when the power disturbance occurred? Did a major appliance (like a refrigerator, furnace or air conditioner) cycle on or off? Did a fuse or circuit trip? Was there a weather disturbance? Note your observations in the Simultaneous Events column.
- Was the affected equipment inoperable? How? For how long? Were you able to reset the equipment?
- Did you notice any permanent damage to the affected equipment? If yes, what?
* To view and print this document, you need Adobe®
Acrobat® Reader. 
