You need to unplug all electronic equipment, televisions, computers, etc. from affected branch circuits until this problem is fixed. Electronic equipment includes washing machines with digital displays, and microwaves.
If every circuit in the house is affected, there is a good chance that the problem is somewhere in the power company lines. Still you need to measure the voltage at the big lugs where the service wires enter your panel. A somewhat more reliable determination that the problem needs the help of your electric company is had if your electrical professional can poke the voltmeter probes between the wire strands as opposed to just touching the lug and the seesawing voltage readings are observed there.
While you may be responsible for repairing or relacing defective equipment all the way up to where the wires from the utility pole reach your house, you should not be charged for a "nuisance call" if the problem is upstream of your main panel.
The most common and handy device suitable for testing the lines for this "open neutral" condition is a hair dryer.
The disadvantages of crab apple trees. In summer, the apples are too sour to pick and eat. In winter the birds come and leave dropping all over the place.
Last edited by AllanJ; 03-28-2011 at 08:42 AM.