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#24747 - 04/22/03 11:21 AM panel tripping
stan Offline
Member

Registered: 08/15/01
Posts: 38
Loc: ky
Well this house i went to was about 30 years old . The main breaker had blown so they wanted me to replace it,i did. 1 month later it done it again i went theire and reset it. the house isnt overloaded what could it be????????????

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#24748 - 04/22/03 11:32 AM Re: panel tripping
BPHgravity Offline
Member

Registered: 04/08/03
Posts: 141
Loc: Port Charlotte, Florida
It sounds like there could be a serious ground fault that only occurs because of a specific load coming on. Meaning, is it possible that this occures right after the homeowner turn on a large load like a pump motor or heater unit? If the ampere reading with typical loads on is not near the OCD rating, this is the only thing I can think that could be causing this to happen.
_________________________
Bryan P. Holland, ECO.
Secretary - IAEI Florida Chapter

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#24749 - 04/22/03 11:42 AM Re: panel tripping
Bill Addiss Offline
Member

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

How about vibration?
Anyone banging on the walls near the panel?

Bill

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#24750 - 04/22/03 11:54 AM Re: panel tripping
stan Offline
Member

Registered: 08/15/01
Posts: 38
Loc: ky
gravity then what should i do im in a mess???

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#24751 - 04/22/03 12:20 PM Re: panel tripping
mamills Offline
Member

Registered: 11/30/01
Posts: 739
Loc: Wharton, Texas, USA
Stan: Is this a bolt-on main breaker, or is it a plug-on? Any signs of overheating around it?

Mike (mamills)

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#24752 - 04/22/03 12:44 PM Re: panel tripping
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
I too would look for signs of heating, the only times I have seen a branch circuit fault take out a main, the branch breaker had also tripped, but it might happen.

Are you sure of the connected load?

Have you checked your amp-clamp against a known load to verify it is working properly?
_________________________
Bob Badger
Construction & Maintenance Electrician
Massachusetts

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#24753 - 04/22/03 01:12 PM Re: panel tripping
Bill Addiss Offline
Member

Registered: 10/07/00
Posts: 4196
Loc: NY, USA
Back to the vibration thing. I have seen several times where vibration had tripped the main. Once or twice when siding was being done and once when when a roof was being redone above the panel.

Was any construction being done?

Bill

[This message has been edited by Bill Addiss (edited 04-22-2003).]

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#24754 - 04/22/03 01:16 PM Re: panel tripping
C-H Offline

Member

Registered: 09/17/02
Posts: 1508
Loc: Stockholm, Sweden
Stan, I take it that none of the circuit breakers had tripped except for the main breaker?

If one of the circuit breakers is faulty and won't trip, the main breaker will trip instead if there is a short in the branch circuit.

A remote possibility that comes to mind is that there is a ground fault or short circuit soon after the branch breaker resulting in a very high current. The new main breaker responds faster than the old branch breaker. However, this doesn't explain why the old main breaker blew.

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#24755 - 04/22/03 06:32 PM Re: panel tripping
stan Offline
Member

Registered: 08/15/01
Posts: 38
Loc: ky
well guys thanks for the ideas,in the morning im going to see if any of the branch circuit breakers are faulty.By the way no vibrations can occure its on a basement wall. thanks guys

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#24756 - 04/23/03 05:23 AM Re: panel tripping
n1ist Offline
Member

Registered: 02/13/02
Posts: 176
Loc: Malden MA
What brand panel? FPE breakers are well-known to not trip if there is a fault...

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