On Tuesday, March 29, 2016 at 10:05:15 AM UTC-5, GARYWC wrote:
During the last three weeks, SOME of the lights in my living room, den and bathrooms become dim at times and are normal at other times. (None of the light bulbs in those fixtures have burned out).

This condition does NOT seem to affect lights in other rooms, TVs, computers, appliances and other electrical devices.

Might this problem be with:

the city's power supply
the service panel
the individual circuit breaker(s)
the wires between the circuit breaker and the affected lights
the specific light fixtures
or ???

If you have a small battery powered AM radio, you can tune it to a vacant section of the band and listen for a crackling noise when the lights dim. This would indicate an arc somewhere. If you play with the volume control as you move the radio around the room, you may be able to determine the general area of the house where the arc is located. I've used an AM/FM pocket radio tuned to the AM band to find live wires in a wall before I obtained a voltage detector but the radio is more sensitive to the electrical/RF noise produced by an arc. ^_^

[8~{} Uncle Arc Monster