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15 amp circuit stumper #191863
01/16/10 04:23 PM
01/16/10 04:23 PM
J
jdevlin  Offline OP
Member
Joined: Aug 2002
Posts: 402
welland ontario canada
This one has me stumped.
Here the situation.

15 amp circuit trips when heater plugged into it. Nothing else on circuit.
Ammeter reads 12.5 amps at breaker.
Same heater runs fine on an other circuit drawing same 12.5 amps

OK, bad breaker you say. Swapped breaker with one beside it in panel. Still trips.
Breaker is not hot. Takes about 5 minutes to trip.
Remove breaker and inspected bus. Looks perfect as does breaker contact.

What to check next?

Breaker panel is only about 15 years old FPE. I installed it and I also installed the circuit so I know where the cable runs exactly.

Don't bitch about FPE panel. We still install them new here in Canada. Very popular brand.

Work Gear for Electricians and the Trades
Re: 15 amp circuit stumper [Re: jdevlin] #191864
01/16/10 05:19 PM
01/16/10 05:19 PM
electure  Offline

Member
Joined: Dec 2000
Posts: 4,264
Fullerton, CA USA
"Swapped breaker with one beside it in panel. Still trips."

My suggestion is to replace the breaker with a brand new one, instead of a used one that may or may not have the same problems.


Re: 15 amp circuit stumper [Re: jdevlin] #191865
01/16/10 07:21 PM
01/16/10 07:21 PM
S
sparkyinak  Offline
Member
Joined: Jul 2007
Posts: 1,328
Alaska
By change the breaker that is tripping a gfci breaker? Another thing you can do is instead of clamping the load wire, clamp the main line. Does your meter have a max hold feature that changes only when the voltage increases?


"Live Awesome!" - Kevin Carosa
Re: 15 amp circuit stumper [Re: sparkyinak] #191866
01/16/10 08:14 PM
01/16/10 08:14 PM
J
jdevlin  Offline OP
Member
Joined: Aug 2002
Posts: 402
welland ontario canada
Breaker is not GFCI or AFCI. I was clamped right at the breaker. I did use the hold feature and it did not spike high. The high max was 12.55 amps.

Do you think it is possible that more than one breaker could be tripping at the low value?

I guess a new breaker should be next try? Anything else that could possibly cause something like this?

Re: 15 amp circuit stumper [Re: jdevlin] #191867
01/16/10 08:22 PM
01/16/10 08:22 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,166
Estero,Fl,usa
Swap with the breaker you know it works on


Greg Fretwell
Re: 15 amp circuit stumper [Re: gfretwell] #191872
01/17/10 01:08 AM
01/17/10 01:08 AM
L
leland  Offline
Member
Joined: Aug 2007
Posts: 853
Lowell area, Ma. USA
Bad cable? Takes 5 minutes to trip,maybe that long to heat up the conductors and find a fault in the insulation.

Re: 15 amp circuit stumper [Re: leland] #191875
01/17/10 02:03 AM
01/17/10 02:03 AM
T
twh  Offline
Member
Joined: Mar 2004
Posts: 925
Regina, Sask.
I'm not surprised that two breakers, possibly from the same batch, both trip at the same value, and no one thinks that FPE has mastered the making of breakers.

Re: 15 amp circuit stumper [Re: twh] #191876
01/17/10 02:09 AM
01/17/10 02:09 AM
I
IanR  Offline
Member
Joined: Dec 2004
Posts: 328
Palm Bay FL USA
Hmm, an FPE that trips early? I thought they usually had the opposite problem wink

Re: 15 amp circuit stumper [Re: IanR] #191878
01/17/10 02:41 AM
01/17/10 02:41 AM
Trumpy  Offline

Member
Joined: Jul 2002
Posts: 8,231
SI,New Zealand
Did you open and check the receptacle you originally had the heater plugged into?

Re: 15 amp circuit stumper [Re: Trumpy] #191887
01/17/10 11:49 AM
01/17/10 11:49 AM
J
jdevlin  Offline OP
Member
Joined: Aug 2002
Posts: 402
welland ontario canada
The receptacle has been opened. What type of problem in a receptacle could make a breaker trip at 12.5 amps?

Trying to understand what other than the breaker could be the problem now that I have been think more about this.

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