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Old 11-11-2008, 10:36 PM   #16
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Where is my power going??


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Originally Posted by 220/221 View Post
It does sound like a faulted hot conductor.

No j boxes between source and garage???

Direct buried cable??
No J boxes the cable is buried

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Old 11-11-2008, 10:49 PM   #17
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Where is my power going??


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Originally Posted by Billy_Bob View Post
At the supply point, I assume this would be a double pole breaker for the garage?

Did you use the screws on the breaker for this test?

Did you also measure the bare wires coming out of the screw down lugs on the breaker?
Yes, a double pole breaker, I initially tested just the screws but realized that this was flawed for the same reasons that you sited so I tested at the bare wires as well.
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Old 11-11-2008, 10:52 PM   #18
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Where is my power going??


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Switch the wires and if the problem switches you can start digging.
I did not think of that, makes sense! Thanks! I really hope the problem does not switch though.
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Old 11-12-2008, 07:16 AM   #19
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Where is my power going??


You need to pull that 30 amp breaker out and put the CORRECT size in...unless you want to burn your garage down.
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Old 11-12-2008, 10:57 AM   #20
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Where is my power going??


From what I am reading the OP has still not checked between phases only to ground. OP. When you check to ground you are only checking one leg. Test for 240 volts across both hot leads inside and at the garage. If you have 240 in the house and you have something different at the garage, you will know it is somewhere in between. Take these measurements with a load.
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Old 11-12-2008, 11:22 AM   #21
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Where is my power going??


Is there any chance the wires got cut and water seeped in? If the wire is aluminum, are the wires at the lugs correctly prepared?

Check the voltage from hot to hot at the subpanel's breaker at the main and then check from hot to hot at the sub.
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Old 11-13-2008, 01:23 PM   #22
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Where is my power going??


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Originally Posted by rgsgww View Post
You need to pull that 30 amp breaker out and put the CORRECT size in...unless you want to burn your garage down.
I am sorry for the confusion, I do have a 30 amp breaker but it is a dedicated circuit to plug my motorhome into and it runs off of 10AWG wire.

My general use plugs in my garage run off of a 20 amp breaker, 12 AWG

My lights run off of a 20 amp breaker, 12AWG

Sorry for the confusion this caused.
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Old 11-13-2008, 01:25 PM   #23
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Where is my power going??


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Originally Posted by J. V. View Post
From what I am reading the OP has still not checked between phases only to ground. OP. When you check to ground you are only checking one leg. Test for 240 volts across both hot leads inside and at the garage. If you have 240 in the house and you have something different at the garage, you will know it is somewhere in between. Take these measurements with a load.
Thanks, I will try that tonight, I just got back from traveling so have not been able to continue troubleshooting.
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Old 11-13-2008, 09:03 PM   #24
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Where is my power going??


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Originally Posted by J. V. View Post
From what I am reading the OP has still not checked between phases only to ground. OP. When you check to ground you are only checking one leg. Test for 240 volts across both hot leads inside and at the garage. If you have 240 in the house and you have something different at the garage, you will know it is somewhere in between. Take these measurements with a load.
I tested between phases with a load:
at the main 244vac
at the garage 138vac

I also swapped the phases at the 100amp circuit breaker in the main but the phase that was giving me trouble stayed the same at the garage.

I then removed the wires from the 100amp CB in the main and connected them together and tested for continuity in the garage, I got -500k ohms.

It really is looking like I'm gonna have to start digging huh?
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Old 11-13-2008, 09:10 PM   #25
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Where is my power going??


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Old 11-14-2008, 08:38 AM   #26
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Where is my power going??


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Very nice...I get the picture.

Thanks everyone for helping me out, I will let ya'll know how it goes.
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Old 11-16-2008, 10:25 AM   #27
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Where is my power going??


Before you start digging, ask yourself:
Is there any possible way something else is causing this???
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Old 11-16-2008, 11:22 AM   #28
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Where is my power going??


Due to the sensitivity of newer electronic meters testing for resistance without a megger is not very accurate. Testing for voltage can be also not accurate.

I would turn off all the breakers at the garage and turn on the breaker at the home. Next, either use a solinoid type tester or rig a 60 watt light bulb in parallel with your tester. Test line to line, each line to neutral, and each line to ground at the main panel, and at the garage panel.

When you study your results you will know for sure if the problem is: in the house, in the garage, or in the wire in between.

If it actually is the wire in between, follow out as much of the wire as you can. There may be a junction box on the side of one of the buildings with a splice.

If you find you do actually need to dig, go a head and buy new wire before you start, and just replace the cable. I would not even bother to try to fix the existing cable, or even determine where it is buried.
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Old 11-16-2008, 02:37 PM   #29
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Where is my power going??


If you're within an hour's driving time from DC I'll lug my test equip. out there and render MHO. Gas is on you.


Last edited by Yoyizit; 11-16-2008 at 02:51 PM.
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