This is probably a simple question for this group. A co-worker recently had a residence rewired and has experienced the light bulbs in one hallway burning out every couple of weeks. Any thoughts on what is causing this?
As the others said. Most likely a loose neutral somewhere, obviously try looking at the fixture first. Last resort, try a 130v incandescent lamp. Covers many a problem. Cheers NS4M
NS4M has the right idea. There is a formula for incandescent bulbs in our apprenticeship books that says: (Actual Life/Rated Life) = (Rated Volts/Actual Volts)^13.
Take a 130 volt, 1000hr rated bulb and feed it 123 volts and you get: AL/1000=(130/123)^13 or 2053 hours actual life.
In contrast, take a 120 volt 1000hr bulb and feed it 123 volts and you get: AL/1000=(120/123)^13 or 725 hours actual life.
Those 130v bulbs are life savers in hard to reach fixtures.