ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Violation?
by renosteinke - 01/27/23 09:52 PM
Does NEC 551.71 (F) apply to dwellings?
by BigB - 01/20/23 10:46 AM
Power submeter connections
by HotLine1 - 01/19/23 09:09 AM
AFDD's coming to the UK
by Texas_Ranger - 01/17/23 07:22 PM
New in the Gallery:
Burger King crown sillyness
Burger King crown sillyness
by wa2ise, December 11
240/208 to a house
240/208 to a house
by wa2ise, October 9
Who's Online Now
0 members (), 18 guests, and 10 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#7190 01/25/02 09:02 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?

#7191 01/25/02 10:59 AM
Joined: May 2001
Posts: 717
G
Member
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 01:56 PM
Joined: Oct 2000
Posts: 4,081
Likes: 3
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
#7193 01/25/02 10:57 PM
Joined: Jan 2002
Posts: 36
N
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

#7194 01/26/02 10:13 AM
Joined: Aug 2001
Posts: 329
S
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.


Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *
2023 National Electrical Code (NEC)
2023 NEC Now Available!
 
* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Vlado
Vlado
Croatia
Posts: 28
Joined: February 2011
Top Posters(30 Days)
BigB 4
triple 3
Popular Topics(Views)
302,775 Are you busy
231,979 Re: Forum
216,705 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5