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Old 03-09-2012, 11:26 AM   #1
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Panel Fault -Unknown Cause


Second time this occurred, two weeks apart. This is an account of the second time, because I was more careful to slowly troubleshoot:

The power was out to half of the home, and upon inspection to the panel, none of the breakers had flipped. I flipped the suspect breakers one by one to be sure, on each circuit that was out and nothing happened.

Then, I flipped a circuit that had power to OFF, and the four OUT circuits turned on. I flipped the unrelated circuit back on, and all is well.

First time this happened I just flipped circuits to exercise the breakers, with the same result.

Main looks good, especially because the OUT circuits were on both sides of the panel. Could this be solar flares ? OK, seriously, what is this?

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Old 03-09-2012, 11:40 AM   #2
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Panel Fault -Unknown Cause


Second time this occurred, two weeks apart.
>intermittent failures

The power was out to half of the home
>split bus panel?

, and upon inspection to the panel, none of the breakers had flipped. I flipped the suspect breakers one by one to be sure, on each circuit that was out and nothing happened.
>internal breaker contacts failed anyway?

Then, I flipped a circuit that had power to OFF, and the four OUT circuits turned on
>intermittent connection or bad neutral

. I flipped the unrelated circuit back on, and all is well.
>there are changes happening in this circuitry that you may not be causing.

First time this happened I just flipped circuits to exercise the breakers, with the same result.
>there are changes happening in this circuitry that you may not be causing.

In general, ask yourself:
What must be true for this to be happening?
and
What am I assuming is true that is not true?

With a two week return period, knowing with any certainty that any fix anyone tries has actually worked will be pretty time consuming. It's a 6 week no-fault wait for 95% certainty and a four week wait will give you 86% certainty. I would find a reliable way to induce the fault.


Last edited by Yoyizit; 03-09-2012 at 11:50 AM.
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Old 03-09-2012, 11:46 AM   #3
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Panel Fault -Unknown Cause


One side of your main breaker has become intermittent or there is a connection problem somewhere between the utility transformer and one of the bus's in your panel.

Each bus alternates on both sides of you panel so that is why all of the breakers on one side are not effected as you mentioned.

Last edited by zappa; 03-09-2012 at 12:39 PM.
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Old 03-09-2012, 11:55 AM   #4
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Panel Fault -Unknown Cause


Quote:
Originally Posted by zappa View Post
One side of your main breaker has become intermittent or there is a connection problem somewhere between the utility transformer and one of the buss's in your panel.

Each bus alternates on both sides of you panel so that is why all of the breakers on one side are not effected as you mentioned.
This would be my guess. Is the main breaker hot?
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Old 03-09-2012, 12:05 PM   #5
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Panel Fault -Unknown Cause


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Last edited by jbfan; 03-09-2012 at 12:06 PM. Reason: Answered wrong post
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Old 03-09-2012, 12:16 PM   #6
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Panel Fault -Unknown Cause


You will need a meter to check the voltage to see if it's on your end or not. If you are not comfortable doing any of this please get help.

If you don't have 240 before your main breaker it could be anywhere between your main panel and your service drop from the pole or underground lines.

If there is 240 between both hot legs in the panel before the main breaker and not after the breaker you have a main breaker problem.

If you have 240 before and after your main then there could be a bad connection between the bus bar and your main breaker.

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