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
Industrail Control Panel bonding per 409.108
by sparkyinak
39 minutes 26 seconds ago
Calling all Non-US members!! (Non-US only)
by aussie240
Yesterday at 02:39 AM
Photo Upload Tutorial
by DanK
12/06/16 11:35 PM
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 9
sparkyinak 8
Texas_Ranger 8
Trumpy 6
Who's Online
0 registered (), 234 Guests and 5 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#23013 - 03/10/03 05:17 AM Another Arc Fault Question
Happi_Man Offline

Registered: 06/12/02
Posts: 213
Loc: Columbus, Ohio - USA
What would make an arc fault breaker trip on a bedroom circuit other than a ground and a neutral touching (which isn't the case - we checked all the switch boxes) or a pinched wire (staple pounded in too hard)?

We got one that trips the instant you flip on the light switch...checked all the outlets in the rooms for a loose connection and checked all the grounds and neutrals in the switch boxes...

just for the record - we didn't wire this house to begin with

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....

#23014 - 03/10/03 05:51 AM Re: Another Arc Fault Question
Ron Offline

Registered: 03/13/02
Posts: 577
Loc: White Plains, NY
The n-g touching will not trip an afci breaker. Has there been any new siding put on the outside of the house? Nails piercing the NM will do the trick.

#23015 - 03/10/03 05:59 AM Re: Another Arc Fault Question
txsparky Offline

Registered: 05/25/01
Posts: 578
Loc: Magnolia,.Texas U.S.A.
It would trip it if it is a combination Afci/gfci breaker.

Have you tried disconnecting the fixture to see if that is where the fault is?

#23016 - 03/10/03 08:38 AM Re: Another Arc Fault Question
Bill Addiss Offline

Registered: 10/07/00
Posts: 4196
Loc: NY, USA

This may sound strange, but I have had this happen where the problem was an internally shorted Light Bulb. Try taking the Bulb(s) out of the fixture and see what happens. It's worth a shot.


#23017 - 03/10/03 08:56 AM Re: Another Arc Fault Question
resqcapt19 Offline

Registered: 11/10/00
Posts: 2209
Loc: IL
All AFCIs have built in ground fault protection at the 30 to 50 mA level and a neutral to ground short will cause them to trip.

#23018 - 03/10/03 09:05 AM Re: Another Arc Fault Question
jb Offline

Registered: 03/01/02
Posts: 27
Loc: kentucky

I had this same thing happen to me, also in a house that I did not wire from the beginning. It turned out that the neutral from the AFCI circuit was landed on the neutral bar in the panel, and the neutral from another circuit was landed on the AFCI breaker. Therefore, whenever a load was placed on the AFCI circuit, it sensed a ground fault and tripped. Lots of head scratching over that one until I finally double checked all of the wires in the panel.


#23019 - 03/10/03 02:45 PM Re: Another Arc Fault Question
zapped208 Offline

Registered: 02/18/03
Posts: 201
Loc: Somewhere in USA
Another problem would be if there is 2 separate feeds in the switch box , and all the neutrals are spliced together,would trip the afci also.
Shoot first, apologize later.....maybe


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