Question about Siemens /ITE 100Amp 3-pole molded circuit breaker

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1 side of 220 v line drops out - no main breaker reset

Half the breakers in my Siemans 100A 24 circuit box show zero voltage - no main entrance breaker pop off. Reset main and all work for a while. I replaced the main and everything worked for several months - now old problem is back. I purchased the panel and main breaker from Home Depot for under 60 bucks. The main breaker part number replacement from Siemans is over 170 bucks - something isn't right here. Are we looking at QC rejects or cheap look alikes? Any thoughts about what is wrong?

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Sounds to me as if you are losing one side of the line inside the meter enclosure , possibly due to lose connection or corrosion on terminals in base i think i would remove meter and have a look see if you are not comfortable to do this have an electrician to do ck

Posted on Jan 01, 2009

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Low voltage in 110 recepts. and 110 in 220 outlet, could 100 feed breaker be problem. breaked is 25+ years old


The breaker could be the problem. I take it that you have a meter, you can pull off the panel cover and check the line side of the main breaker ( the side from the power company) be VERY carefull as you cannot turn of the power to this side of the breaker!!! Form one wire to the other on the breaker you should have roughly 220 volts. From one on the breaker to the ground/nuetral bar you should have roughly 110 volts. I f you do not have 220 across the two wires on the breaker its the power company you need to call if the 110 voltage is not right you may have a loose ground/nuetral... Just be VERY CAREFULL!!!! Hope this helps you

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I am trying to install a 100 amp breaker into a Homeline 200 amp load center. Breaker flips every time main breaker is turned on.


I'm assuming since it's a Homeline panel you're using a HOM2100 breaker. If it stripping then you must have a short circuit in your 100A circuit, or the breaker is defective. Disconnect your load from the breaker, and turn main on. Be sure you have the correct load conductors connected to the breakers. Typically red and black on the breaker, white on neutral bar. Bare to ground bar

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Can i replace the main (100 amp) is a sq d QOC20u100F panel with a 200 amp main--i will up grade meter socket and entrance cable to 200 amps cwalker


First the part number QOC20U100F is a flush mount panel cover. The panel you have is most likely a :QO116M100. No you cannot replace the breaker as the bus in the panel is only rated for 100A. In addition I believe this is a 20CKT panel. If you're gonig to a 200A service you'd probably want more spaces than that. Home Depot and Lowes both carry 200A panels with starter set of breakers at reasonable price. The QO panels are a bit better than the Homeline
Here is a link to manual for their panels. :
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220 appliances in house all out.lights up but either dont heat or wont bake .lightning could be culprit but never lost tv reception.dryer runs ,no heat.water heater out.stove lights up wont get hot.shut...


Sounds like you have lost one leg of your power

Think of it like this

You an upside down "Y" at the top of your breaker panel
220 - 240 volts come in the Y and break in half 120 volts to each leg of the "Y"
A 220 Volt breaker straddles both legs a 110 volt breaker only contacts one leg
I suspect that you have lost one leg
Possibly at the main breaker ( top most)( main disconnect) in your panel
If you have a tester with the capacity to test 240 you can test the two top lugs where the main wire comes in Test them together That is one probe of your tester on each wire you should show 240+/- volts
Then you can move down through the panel 120 +/- on each leg
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What are you doing???

Are you installing a 220 V GFI breaker in your main or sub panel?

Judging by the picture, you have a breaker that wants to have a direct connection to the ground buss. Have you tried that?

I have some experience with a similar CH breaker. I installed the breaker, hooked the two wires representing the line to the breaker, put the white to the neutral buss bar and everything was cool.

Let me know what happens

A

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sounds like a loose connection ,or possibly a weak main breaker.

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How long does the breaker hold after resetting? You probably have an 'intermittent ground fault' . If the breaker just trips randomly. One way to locate it would be a megger test on all three phases going out to the loads. Any phase that shows a possible ground could help narrow it down. Sometimes, if possible, you can turn certain breakers off and see if your problem goes away.A meter in record mode could be the best solution. Fluke meters have this option and you could monitor the phase voltage and during a 'ground fault' the voltage will drop some and you'll lock in the dip on the meter.

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Pole barn subpanel has suddenly dropped half of circuits


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2 Answers

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