Arc Fault Breaker question

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Jeff Johnson

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Aug 29, 2011, 1:16:14 PM8/29/11
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My daughter and son-in-law's house has a weird situation that their electricians cannot figure out.  I thought I would run it by you guys.

Whenever they run 2-3 items off of a circuit in their house, the arc fault breaker keeps tripping.  I'm familiar with GFCI, but these are different.  The breakers are 15 amp and they are no where near that usage when the breakers trip.  They have swapped out breakers but still get the problem.  I offered to just switch them with regular breakers, but that will void their house warranty (its a new house).

Any suggestions?  Scott is going to run a clamp meter over the line to see how much current is actually running, no results on that yet.

Mark Endicott

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Aug 29, 2011, 1:22:10 PM8/29/11
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Does it matter which devices are plugged in? There may be a short in one of those devices.

Mark

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Jeff Johnson

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Aug 29, 2011, 1:24:35 PM8/29/11
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I sent Scott an email to list out the exact specifics, but in some cases its a audio device (lulaby playing thing for babies) and then turning on a bathroom light would set it off.

Jeff Johnson

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Aug 29, 2011, 1:46:17 PM8/29/11
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Got this from Scott:

Okay…

 

There are four 15 Amp circuit breakers (one for the master bedroom/bathroom, one for girls’ bedroom/bathroom, one for living room/front door lights, and one for the guest bedroom/hallway light and receptacle). 

 

When the house was built, these were placed directly under the rest of the house’s breakers. Each breaker tripped at least once and the master and girls’ bedroom tripped multiple times.  We called…the tech moved the breakers to the bottom of the breaker box.  The master and girls’ bedroom breakers kept tripping.  We called again…the tech changed the guest bedroom breaker.  The master bedroom still trips a lot, and the girls’ bedroom breaker trips randomly about once a month.  Another company is coming out tomorrow to take a look, so I’ll let you know what they say.

 

Thank you very much for thinking of us and posting this on the board.  The whole neighborhood is like this by the way.  I see my neighbor resetting his breakers all of the time…at least once or twice a week.

 

Anyway, thanks again!  Talk at you later, buddy.

Brian Wagner

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Aug 29, 2011, 3:03:37 PM8/29/11
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Not sure what is going on, but make sure your have a very solid
ground. That is make sure there is a heavy gauge copper wire running
from the panel to a 6' ground rod driven into the ground. A ground
connection to a cold water pipe is not good enough. Also double check
that the screw connections to the ground are solid.

b

Brian Wagner

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Aug 29, 2011, 3:06:28 PM8/29/11
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Another thought... I had a breaker tripping problem in my house that
went away when I replaced the old cheap dimmer switch in our dining
room. Check for that.

Pat McCarthy

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Aug 29, 2011, 3:13:58 PM8/29/11
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OK, an Arc Fault breaker that continually trips is an indication that you have something that's arcing, somewhere on the circuit.

The Current is probably NOT the issue here. You could be only sipping 2A of the 15A limit, but SOMETHING is causing the "trip-to-safe" condition.

For a brief intro to AFCI, take a look at the Wikipedia entry here

http://en.wikipedia.org/wiki/Arc-fault_circuit_interrupter

And the fact sheet, here:

http://www.afcisafety.org/


Thanks,

Patrick McCarthy

-----Original Message-----
From: lv...@googlegroups.com [mailto:lv...@googlegroups.com] On Behalf Of Brian Wagner
Sent: Monday, August 29, 2011 3:06 PM
To: lv...@googlegroups.com
Subject: Re: {LVL1} Arc Fault Breaker question

Another thought... I had a breaker tripping problem in my house that
went away when I replaced the old cheap dimmer switch in our dining
room. Check for that.


On Mon, Aug 29, 2011 at 3:03 PM, Brian Wagner <br...@tegrasys.com> wrote:
> Not sure what is going on, but make sure your have a very solid
> ground.  That is make sure there is a heavy gauge copper wire running
> from the panel to a 6' ground rod driven into the ground.  A ground
> connection to a cold water pipe is not good enough.  Also double check
> that the screw connections to the ground are solid.
>
> b
>
> On Mon, Aug 29, 2011 at 1:46 PM, Jeff Johnson <jeffj...@gmail.com> wrote:
>> Got this from Scott:
>>

>> Okay.


>>
>>
>>
>> There are four 15 Amp circuit breakers (one for the master bedroom/bathroom,
>> one for girls' bedroom/bathroom, one for living room/front door lights, and
>> one for the guest bedroom/hallway light and receptacle).
>>
>>
>>
>> When the house was built, these were placed directly under the rest of the
>> house's breakers. Each breaker tripped at least once and the master and

>> girls' bedroom tripped multiple times.  We called.the tech moved the


>> breakers to the bottom of the breaker box.  The master and girls' bedroom

>> breakers kept tripping.  We called again.the tech changed the guest bedroom


>> breaker.  The master bedroom still trips a lot, and the girls' bedroom
>> breaker trips randomly about once a month.  Another company is coming out
>> tomorrow to take a look, so I'll let you know what they say.
>>
>>
>>
>> Thank you very much for thinking of us and posting this on the board.  The
>> whole neighborhood is like this by the way.  I see my neighbor resetting his

>> breakers all of the time.at least once or twice a week.


The information transmitted is intended only for the person or entity to which it is addressed and may contain CONFIDENTIAL material. If you receive this material/information in error, please contact the sender and delete or destroy the material/information.

Pat McCarthy

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Aug 29, 2011, 3:21:42 PM8/29/11
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There's now the law in all but 1 state (IN)
Interestingly, Purdue has been playing a part in the adopting of the breakers

"... Perdue urged the chairman of the Building Code Council not to roll back a requirement that arc fault circuit interrupters be used for all rooms of new homes....The council appeared ready to roll back the requirement under pressure from the homebuilding industry. Builders say the devices add hundreds of dollars to the cost of a home and can trip when devices such as ceiling fans are turned on.
Perdue says the benefits of fire prevention outweigh the drawbacks..."

So, look for items that draw an arc (anything with a motor). Whatever you find, you are probably looking at the problem device.

It will most likely cause the issue right at activation, before the field is completely developed (startup surge) when it "looks" most like an uncontrolled surge

(Good idea, Stupid breaker)

Jeff Johnson

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Aug 29, 2011, 3:35:30 PM8/29/11
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I would never take the word of an academic on "what is best" (present company excluded).  True, an arc could set off a fire if there is gas in the house or something flamable.  But by the time the arc sensor trips, an arc has already occurred.  Wait until you come home from vacation to realize your alarm circuit, or fridge has tripped and your house has been robbed or your kitchen smells like dead fish.

If I build a house and they have them in it, I will swap them out for regular breakers immediately.  What a major PITA.

Pat McCarthy

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Aug 29, 2011, 3:42:02 PM8/29/11
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Well, problem is, many breakers are being phased out for residential use, getting replaced with this new kind...

One thing that you could do is to have the tech replace at least the most often tripped breaker with one from Siemens...

All Siemens Combination Type AFCIs include unique Siemens exclusive and patented LED trip indicators. These indicators provide a valuable analysis tool to help electricians and home owners alike pinpoint the type of problems that cause the AFCI to trip, and therefore save valuable time during troubleshooting and repair. These indicator LEDs are located near the handle of the breaker and will distinguish arcing faults, arcing to ground and overcurrent conditions.

Here is how the trip indicators work:
The LED indications will appear for 5 seconds each time the CAFCI is turned "ON" up to 30 days after the last trip.

One LED will be illuminated if the last trip was a result of an arcing fault. On the 2-pole CAFCI, the leg on which the arcing fault was detected can be determined based on which single LED was illuminated.

Two LEDs on the 1-pole CAFCI device or three LEDs on the 2-pole CAFCI device will be illuminated if the last trip was a result of an arcing fault to ground.

No indication will be displayed if the CAFCI trips as a result of an overcurrent condition.

The last known trip indication can also be manually cleared from memory to assist with verifying resolution of the problem.


Things that are causing false readings :
Ceiling Fans
Vacuums
Heating pads
Toasters
Washers/Dryers
Christmas trees with twinkle lights

So, looks like 2 groups:

1: Motors
2. Thermostats

Good luck finding the offending item(s)

Jeff Johnson

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Aug 29, 2011, 3:44:12 PM8/29/11
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Looks like mostly anything with an inductive load, which would make sense since they can arc if not designed right.

Jeff Johnson

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Aug 29, 2011, 3:53:58 PM8/29/11
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Well, if they are phased out here (forgive the pun), perhaps I can pick some up in Canada when I go to get my large flow toilets.

On Mon, Aug 29, 2011 at 3:42 PM, Pat McCarthy <pmcc...@humana.com> wrote:

Pat McCarthy

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Aug 29, 2011, 3:57:22 PM8/29/11
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Pick me up a toilet when you go next…

 

 

Thanks,

 

Patrick McCarthy

Aaron VerDow

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Aug 29, 2011, 4:23:19 PM8/29/11
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Would large caps be able to smooth the line power out enough to hide
small arcs from the breaker?

On Aug 29, 3:57 pm, Pat McCarthy <pmccar...@humana.com> wrote:
> Pick me up a toilet when you go next...
>
> Thanks,
>
> Patrick McCarthy
>
> From: lv...@googlegroups.com [mailto:lv...@googlegroups.com] On Behalf Of Jeff Johnson
> Sent: Monday, August 29, 2011 3:54 PM
> To: lv...@googlegroups.com
> Subject: Re: {LVL1} Arc Fault Breaker question
>
> Well, if they are phased out here (forgive the pun), perhaps I can pick some up in Canada when I go to get my large flow toilets.
> On Mon, Aug 29, 2011 at 3:03 PM, Brian Wagner <br...@tegrasys.com<mailto:br...@tegrasys.com>> wrote:
> > Not sure what is going on, but make sure your have a very solid
> > ground.  That is make sure there is a heavy gauge copper wire running
> > from the panel to a 6' ground rod driven into the ground.  A ground
> > connection to a cold water pipe is not good enough.  Also double check
> > that the screw connections to the ground are solid.
>
> > b
>
> > On Mon, Aug 29, 2011 at 1:46 PM, Jeff Johnson <jeffjohn...@gmail.com<mailto:jeffjohn...@gmail.com>> wrote:
> >> Got this from Scott:
>
> >> Okay.
>
> >> There are four 15 Amp circuit breakers (one for the master bedroom/bathroom,
> >> one for girls' bedroom/bathroom, one for living room/front door lights, and
> >> one for the guest bedroom/hallway light and receptacle).
>
> >> When the house was built, these were placed directly under the rest of the
> >> house's breakers. Each breaker tripped at least once and the master and
> >> girls' bedroom tripped multiple times.  We called.the tech moved the
> >> breakers to the bottom of the breaker box.  The master and girls' bedroom
> >> breakers kept tripping.  We called again.the tech changed the guest bedroom
> >> breaker.  The master bedroom still trips a lot, and the girls' bedroom
> >> breaker trips randomly about once a month.  Another company is coming out
> >> tomorrow to take a look, so I'll let you know what they say.
>
> >> Thank you very much for thinking of us and posting this on the board.  The
> >> whole neighborhood is like this by the way.  I see my neighbor resetting his
> >> breakers all of the time.at<http://time.at> least once or twice a week.
>
> >> Anyway, thanks again!  Talk at you later, buddy.
>
> >> On Mon, Aug 29, 2011 at 1:24 PM, Jeff Johnson <jeffjohn...@gmail.com<mailto:jeffjohn...@gmail.com>> wrote:
>
> >>> I sent Scott an email to list out the exact specifics, but in some cases
> >>> its a audio device (lulaby playing thing for babies) and then turning on a
> >>> bathroom light would set it off.
>
> >>> On Mon, Aug 29, 2011 at 1:22 PM, Mark Endicott <drpho...@gmail.com<mailto:drpho...@gmail.com>> wrote:
>
> >>>> Does it matter which devices are plugged in? There may be a short in one
> >>>> of those devices.
> >>>> Mark
>
> >>>> On Mon, Aug 29, 2011 at 1:16 PM, Jeff Johnson <jeffjohn...@gmail.com<mailto:jeffjohn...@gmail.com>>
> >>>> wrote:
>
> >>>>> My daughter and son-in-law's house has a weird situation that their
> >>>>> electricians cannot figure out.  I thought I would run it by you guys.
> >>>>> Whenever they run 2-3 items off of a circuit in their house, the arc
> >>>>> fault breaker keeps tripping.  I'm familiar with GFCI, but these are
> >>>>> different.  The breakers are 15 amp and they are no where near that usage
> >>>>> when the breakers trip.  They have swapped out breakers but still get the
> >>>>> problem.  I offered to just switch them with regular breakers, but that will
> >>>>> void their house warranty (its a new house).
> >>>>> Any suggestions?  Scott is going to run a clamp meter over the line to
> >>>>> see how much current is actually running, no results on that yet.
>
> >>>>> --
> >>>>> You received this message because you are subscribed to the Google
> >>>>> Groups "LVL1 - Louisville's MakerSpace" group.
> >>>>> To post to this group, send email to lv...@googlegroups.com<mailto:lv...@googlegroups.com>
> >>>>> To unsubscribe from this group, send email to
> >>>>> lvl1+uns...@googlegroups.com<mailto:lvl1%2Bunsu...@googlegroups.co m>
> >>>>> For more options, visit this group at
> >>>>>http://groups.google.com/group/lvl1?hl=en
> >>>>> For more info about LVL1 visitwww.lvl1.org<http://www.lvl1.org>
>
> >>>> --
> >>>> You received this message because you are subscribed to the Google
> >>>> Groups "LVL1 - Louisville's MakerSpace" group.
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> >> --
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>
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Jeff Johnson

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Aug 29, 2011, 5:14:54 PM8/29/11
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No
Caps on ac act as short circuit

Tyler

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Aug 29, 2011, 6:12:09 PM8/29/11
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The other thing that I've seen have that problem is cheap ceiling fans
and for some reason the remote control ceiling fan controls if they
have any of those. I had to put the darn things in my house and they
certainly are a pain.

Tyler

On Aug 29, 5:14 pm, Jeff Johnson <jeffjohn...@gmail.com> wrote:
> No
> Caps on ac act as short circuit
> lvl1%2Bunsubscr...@googlegroups.co m>>> >>>>> For more options, visit this group at
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Jamie Copeland

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Aug 29, 2011, 6:38:47 PM8/29/11
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Oh no! How do all of those ac motor start caps work?

Jeff Johnson

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Aug 29, 2011, 7:52:56 PM8/29/11
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I'm not sure how the starting caps work, but I do know that AC voltage shorts through capacitors.   Maybe Brad could explain better.

Jamie Copeland

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Aug 29, 2011, 11:29:49 PM8/29/11
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I think that when ac hits a cap the phase is changed by 90 degrees or something like that.
So like in the case of these compressors/etc that utilize star caps they will actually have diff sets of windings and the startup grunt will hit set x then when running speed is reached a switch takes place where the startup cap is then bypassed and the normal phase windings are hit. 

Gurus is that remotely close? And the way a cap just returns ac but at a dif phase is that equiv of shorting?

Tyler Martin

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Aug 29, 2011, 11:58:48 PM8/29/11
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The -90� phase shift would be true in a purely capacitive circuit but
deals with the phase between voltage and current. Capacitive and
Inductive loads changes the reactance (related to phase shift) of a system.

Correct some motors have starter windings which only conduct at lower
than running RPM.

tyler

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