The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!


2017 NEC and Related
2017 NEC
Now Available!

Recent Posts
Parking lot pole light swap....
by gfretwell
Yesterday at 08:46 PM
International Wire Colour Codes
by Tjia1981
10/23/16 12:08 PM
Son of Sparky
by HotLine1
10/20/16 07:43 PM
Speaking of Plugmold ...
by gfretwell
10/17/16 02:37 PM
Broken battery charger? Check for cobwebs!
by gfretwell
10/17/16 02:30 PM
New in the Gallery:
12.5A through 0.75mm▓ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 14
HotLine1 7
ghost307 7
renosteinke 6
Potseal 4
Who's Online
1 registered (HotLine1), 342 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Page 1 of 3 1 2 3 >
Topic Options
Rate This Topic
#74625 - 01/28/07 06:01 PM Halogen bulbs trip breaker.
redneck Offline

Registered: 10/26/05
Posts: 10
Loc: Young Harris Ga. USA
Customer has complaint. He has recessed lights in the bathroom,and when the bulb blows,it trips the breaker. Bulbs are Halogen,120v,Sylvania double life,Capsylite Par 20.

Doesn't happen often,maybe a couple times a year. Breaker only trips when the bulb blows. Standard breaker,not GFCI,and lights are on separate circuit from Receps in Bath.

We didn't do the job,but he called me wondering what it could be.

Any ideas?????


Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#74626 - 01/28/07 06:53 PM Re: Halogen bulbs trip breaker.
ShockMe77 Offline

Registered: 06/11/05
Posts: 823
Loc: Rahway, New Jersey
If the circuit breaker is tripping it can only be one of three things: an overload, a short circuit, or a ground fault.

#74627 - 01/28/07 06:57 PM Re: Halogen bulbs trip breaker.
LarryC Offline

Registered: 07/05/04
Posts: 776
Loc: Winchester, NH, US
Breaker trips also include physical shock, strong magnetic field, and over temperature.

I tend to doubt that any of these, are in fact the cause of this behavior.


#74628 - 01/28/07 07:59 PM Re: Halogen bulbs trip breaker.
frenchelectrican Offline


Registered: 02/06/03
Posts: 938
Loc: Wi/ Paris France { France for ...
there is good chance when the filment break it will delope a arc current like HID for a split sec that just enough to trip the breaker

that one possiblty i can think of

Merci , Marc
Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)

#74629 - 01/28/07 10:08 PM Re: Halogen bulbs trip breaker.

Registered: 12/08/05
Posts: 862
Loc: Titirangi, Akld, New Zealand
Check the loading on the circuit concerned.
If say for example a 16 Amp beaker runs at 14 Amps lighting load, the cold inrush current from all the lamps and the arc from the lamp failing may be just enough to trip the braker.

Is it always the same lampfitting or all over the place ?
The product of rotation, excitation and flux produces electricty.

#74630 - 01/29/07 06:45 AM Re: Halogen bulbs trip breaker.
wageoghe Offline

Registered: 02/14/02
Posts: 24
Loc: Huntsville, AL
I have a fixture (outdoor floodlight) with halogen bulbs (stab in, not screw in) and it (apparently) tripped the breaker when one the bulbs blew. I noticed that other lights (inside the garage) on the same breaker were not on, so I reset the breaker and found that the only thing amiss, at least that I could tell, was the blown bulb in the floodlight.

#74631 - 01/29/07 11:06 AM Re: Halogen bulbs trip breaker.
Beachboy Offline

Registered: 09/02/06
Posts: 26
Loc: Wamego, Kansas USA
I have two 90 watt PAR 40 halogen floodlight bulbs in an outdoor light fixture. Every time a bulb burns out, it trips the 15 amp breaker. I wrote General Elecric lighting department asking their opinions on this, and all they did was send me an apology and a case of new flood bulbs.

#74632 - 01/29/07 12:39 PM Re: Halogen bulbs trip breaker.
SolarPowered Offline

Registered: 07/05/04
Posts: 615
Loc: Palo Alto, CA, USA
I'm thinking a breaker rated "HACR" might be a good workaround, if that's not what's already there. They would be more likely to hold while the lamp filament clears, but will still adequately protect the wiring.

#74633 - 01/29/07 02:27 PM Re: Halogen bulbs trip breaker.
Rewired Offline

Registered: 01/01/06
Posts: 567
Loc: Hamilton, Ontario, Canada
I remember back in my school days every time an overhead projector would burn out a lamp it almost always would trip the breaker. The breakers were Sq-D and located right in the room so it was not too troublesome to reset actually.


#74634 - 01/29/07 04:02 PM Re: Halogen bulbs trip breaker.
Scott35 Offline

Broom Pusher and

Registered: 10/19/00
Posts: 2724
Loc: Anaheim, CA. USA
Marc hit the nail on the head!

Halogen Lamps have what is known as "The Halogen Cycle", which should be known for extended Lamp Life.

Simply put, to get the most life out of the Lamp, keep it as Horizontally Level as possible (+/- 4┬░).
This causes the Atomized Fillament to land back on the Filament, during operation.

When the Filament fails under load, the Atomized material allows an arc to be sustained, and the Arc has no Resistance (actually has negative resistance) - so there is a large increase in load current, which trips the breaker.

Same would occur if any Non-Ballasted Discharge Lamp was thrown across the line.

Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!

Page 1 of 3 1 2 3 >

ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals