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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Posted on Jan 02, 2017


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Your question about Cars & Trucks has been posted.Had a well water pump installed and now one side of the house power is not working could the pump cause something to be grounding out the circuit?

Possible, but not likely. Simple to check, really. Just open the circuit breaker in the main box for the well pump. Then reset the main house breaker. If power is still missing to one half the house, then most likely you have an issue with the supply lines coming in. If you have the ability, open the house main breaker and with a voltmeter, check the two lines coming in, first each to return, and then across the two. If it is a US household, each side should be 110-120vac to return and 220-240 VAC across the phases. My guess is you lost one phase coming into the house. If the power is bad into the top of the main, contact your power company to have them repair their input lines.

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How to get 220 from breaker box

You are measuring in the wrong place! If you have a double breaker in the circuit breaker box, measure the voltage at the dryer outlet. You should have 110, 110, 220 at the different terminals.
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1 Answer

My 200 amp braeker(main is tripped and wont reset. What should the incoming voltage be???

Don't mess with main breaker if you're not qualified.
Wires on main breaker are Hot even when main is turned off.
The only way to turn off main is to pull meter.

1) There are 2 Hot wires that connect to main breaker.
Each wire is 120Volts, and each 120V line is 'out of phase' with the other.
Two out of phase 120V lines create 240Volt circuit when they are wired together.
Read more on links below.

2) It sounds like your main breaker needs to be replaced, unless total of all circuits exceeds 160 amp. Turn off small circuit breakers and try main breaker again. If main resets, then turn small circuits back on one by one. Your main may still be bad.

3) Here are more links that explain electric wiring.

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on breaker or any do-it-yourself project.
Fixya is always less expensive than a service call.

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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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Wiring diagram for siemans GF120GF breaker

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


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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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This is CRITICAL. Do not take the cover off unless you have turned off circuit breakers at the circuit breaker panel AND tested that there is no power. There is a lot of voltage/ampreage here and it could be life threatening if you get shocked. Call an electrician (or a plumber) if you don't know what you are doing.

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