ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Any women electricians here?
by gfretwell - 01/17/22 01:44 PM
12 Lead Motor Connection Weird
by Elektrik - 01/12/22 11:09 PM
Well There's your problem.
by gfretwell - 01/08/22 12:17 AM
Happy New Year!!
by HotLine1 - 01/04/22 09:50 AM
Sangamo s309.2
by Robski - 12/31/21 04:54 PM
New in the Gallery:
240/208 to a house
240/208 to a house
by wa2ise, October 9
Now you know.
Now you know.
by Tom_Horne, September 7
Who's Online Now
1 members (gfretwell), 42 guests, and 16 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 2 1 2
#199129 02/14/11 01:14 PM
Joined: Feb 2008
Posts: 193
S
Member
I finished trimming out a new house about 6 weeks ago. Everyody was happy. I got a call from the homeowner today about his bulbs burning out. It is mainly the can lights. They are burning out all over the house. app 40 cans. They are 6in junos. I did purchase the bulbs at lowes. They had the Sylvania 65w, 120 volt floods at $1 each. Good money savings so I thought. The problem would problably be solved with 130 volt bulbs. However, they did change one bulb and the new bulb "exploded" in the room which brings concern to the homewner. They also had 2 incandescent bulbs on porch fixtures go bad. It is a new house, ch panel and breakers. Any ideas would be appreciated.

Joined: Jul 2004
Posts: 9,677
Likes: 9
G
Member
What is the voltage? When it starts getting up in the 125 range, bulbs go fast.


Greg Fretwell
Joined: Apr 2002
Posts: 7,288
Likes: 4
Member
Any dimmers on the can lights?



John
Joined: Jul 2004
Posts: 783
L
Member
. .

Vibration also shortens bulb life. Any mosh pits or marching bands practicing in the house?

Overheating the bulb also shortens life. Does the bulb packaging state anything about burn base up or down?

Do the occupants work swing or night shifts? Increased voltage at night can also wreak havoc.

Joined: Feb 2008
Posts: 193
S
Member
I haven't checked any voltage yet. I got the call today and am trying to get ideas before I troubleshoot.

There are no dimmers and they do live next to the hospital with helicopter traffic. It is however, a solid house with minimal vibration. I will check the voltage. If it is over 120v, should I recommend that he use only 130v bulbs.

Would the increase voltage cause the bulb to explode. The shrapnel was a concern for them.

Joined: Apr 2002
Posts: 7,288
Likes: 4
Member
Bulb envelope failure may be from severe overvoltage, but IMHO not in your case. BTW, dimmers help bulb life dramatically!

Also, IMHO the old addage of 'ya get what ya pay for' applies to bulbs.



John
Joined: Mar 2005
Posts: 1,803
Member
I have heard complaints from friends about 230v 50W GU10 halogens exploding. The challenge was to find all the bits! These were 'quality' replacements for the original chinese bulbs that expired after 2000 odd hours. Could be a bad batch? BTW, low-energy bulbs must be switched on for a minimum of 15 minutes, or their life will the same as a tungsten filament bulb. That's a challenge in some locations [bathroom, wc etc. ] and a halogen fitting would be better.


Wood work but can't!
Joined: Feb 2008
Posts: 193
S
Member
Hotine, you are right about buying the cheaper bulbs. I will probably replace his bulbs or give him some kind of a credit. Lesson learned.

Joined: Jul 2004
Posts: 9,677
Likes: 9
G
Member
You can also have a loose neutral problem that wreaks all sorts of havoc but blown bulbs is one of them. Check both rails to neutral and be suspicious if they are not exactly the same. Try tripping a couple of the breakers on one phase while watching the voltage and see if it changes but go slow, just do one and watch for a while. If you do have a neutral problem the change can be real sudden, blowing up everything on the less loaded phase.


Greg Fretwell
gfretwell #199163 02/14/11 06:44 PM
Joined: Jul 2002
Posts: 8,412
Likes: 3
Member
I've heard a theory bandied about in the last few years regarding cheap incandescent lamps and their extremely short life-spans (some I've heard are measured in milli-seconds).
What was being said, was that the reason behind the failure is caused by the glass envelope of the bulb not being evacuated properly and there still being air inside the bulb.
Now, everyone knows that a light-bulb filament needs to be in a pretty good vacuum otherwise it's life is pretty short-lived (we even tried this at Night School).

I don't know how much one can actually read into such a theory, but it does make you sort of wonder.

Page 1 of 2 1 2

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

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

 

Member Spotlight
SafetyWired
SafetyWired
Pa, USA
Posts: 44
Joined: July 2013
Top Posters(30 Days)
NORCAL 3
grich 1
Popular Topics(Views)
287,906 Are you busy
220,061 Re: Forum
206,054 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5