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#7190 - 01/25/02 10:02 AM burned out bulbs  
buddy  Offline
Member
Joined: Sep 2001
Posts: 8
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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#7191 - 01/25/02 11:59 AM Re: burned out bulbs  
George Corron  Offline
Member
Joined: May 2001
Posts: 717
Lorton, Va USA
Loose neutral (in home run, splice, etc.) poorly made edison base sockets for the bulbs, poorly made, maybe imported light bulbs.


#7192 - 01/25/02 02:56 PM Re: burned out bulbs  
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,878
NY, USA
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


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


#7194 - 01/26/02 11:13 AM Re: burned out bulbs  
Steve Miller  Offline
Member
Joined: Aug 2001
Posts: 325
Loudoun Cty, VA
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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