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If I understand what you're saying,..
From the picture shown....

You are measuring from the TOP LEFT TERMINAL of the MAIN breaker
to the neutral bar, and you get 120V....

THEN, you measure from the BOTTOM LEFT TERMINAL of the MAIN breaker
to the neutral bar, and you get 120V...

Both of those conditions are correct,
with the breaker in the ON position.


Lastly, You then measure
FROM THE TOP LEFT, TO THE BOTTOM LEFT,
and get Zero Volts.

That is a correct condition also,
since you are essentially putting your probes on THE SAME LINE !!


In order to get 220V, you should measure
FROM TOP LEFT TO TOP RIGHT,

AND ALSO FROM BOTTOM LEFT TO BOTTOM RIGHT

Both of those readings should get you 220V !!


Did I understand your explanation correctly ???

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Good point, I was assuming he meant top and bottom of a horizontal main breaker. If it was 0 volts between incoming hots that provide 120 volts to neutral it will be caused by both hots being on the same phase.


P.S. There are some illegal double connections at the incoming side of the main in your picture, hopefully you got the picture from a page of code violation pictures and not your panel.

Take the readings again with the breaker off. Sounds like one of the hot leads is dead. You are getting a back feed through any 240 volts devices that might be on the system.

Yes, if not measured as I *interpreted*, then hots on same phase.



ILLEGAL !! YES !!
I just pulled the pic off the net, since it showed the
main separate from the breakers.....
The taps were found (and questioned!) by the new owner,
and were feeding a 50 amp A/C circuit.......Yikes !!

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I have had the power company come out and check their side before. They say the problem is on my side and to hire an electrician.

I had an electrician come out, and they want to install a whole new panel. I told the electrician if you can show me why I need a new panel I would be happy to pay for it. I didnt get a solid answer...

Personally, I think the connections inside the meter can are corroded and worn out causing a lost leg.

Meter can is POCO responsibility to open and check. Did they pull the meter when they came to check. A problem in the meter can is your responsibility to repair.

Very similar except the main breaker on mine is Horizontal.

I found this video on youtube. Skip ahead to about 1.25.
Checking for a bad breaker

He shows 240volt on his meter, and its two hots plus a ground no neutral just like mine.

Ok, shut off 100amp main breaker. Performed all my tests again, and I still get the same 1.2V readings, and the same 120v/120v when testing each hot leg to the 2 pole 100 amp breaker individually.

That should 100% eliminate the problem being in the breaker panel correct? This should tell me the problem is in the meter can on the outside of the garage.

There are only 2 240 volt breakers, each has its own individual breaker. One for a window unit air conditioner, the other for a table saw that I no longer own, so its not being used. I have both of those breakers turned off currently.

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Now we're getting somewhere....

As shown in the pic, the red and black probes on incoming feed,
You should read 220V !

If it shows ZERO, only two possibilities exist...

Both lines are connected to the same phase ....

OR one line is completely disconnected some where between panel
and meter can.


If the electrician couldn't determine that,
you need a different electrician !!



Offhand, does this line (from POCO pole) run solely to the
garage, or to the house also??

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Just to clarify,...
You mean testing each hot leg to the neutral bar = 120V.


Sounds like they're both connected to the same phase.

It's highly unlikely, but as you stated that the POCO disconnected
your lines when you were tree trimming, the connections
may have been made wrong there when re-connecting....
But with POCO doing it, it's HIGHLY unlikely, but anything
could happen.

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