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burned out bulbs #7190 01/25/02 10:02 AM
Joined: Sep 2001
Posts: 8
B
buddy Offline OP
Member
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?

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Re: burned out bulbs #7191 01/25/02 11:59 AM
Joined: May 2001
Posts: 717
G
George Corron Offline
Member
Loose neutral (in home run, splice, etc.) poorly made edison base sockets for the bulbs, poorly made, maybe imported light bulbs.

Re: burned out bulbs #7192 01/25/02 02:56 PM
Joined: Oct 2000
Posts: 3,960
Bill Addiss Offline
Member
Bulbs could be loose or subject to vibration somehow from the floor above, slamming doors, etc. Try a rough service bulb in the fixture.

Bill


Bill
Re: burned out bulbs #7193 01/25/02 11:57 PM
Joined: Jan 2002
Posts: 36
N
NoShorts4Me Offline
Member
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

Re: burned out bulbs #7194 01/26/02 11:13 AM
Joined: Aug 2001
Posts: 329
S
Steve Miller Offline
Member
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.


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