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Old 09-23-2018, 07:44 PM   #1
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Default weird troubleshoot black-neutral 120v n black-black 0v

i had a troubleshoot today as subject, called hydro for service yet im confused on how it happens.
detail as following:
when main breaker is off, incoming black-black around 5v, black-neutral 123/125 respectively;
when breaker is on, one side lost voltage while the other side remain around 120.
called hydro for service, yet dont get how this happening.
any comment appreciated
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Old 09-23-2018, 07:51 PM   #2
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Old 09-23-2018, 09:20 PM   #3
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one leg

put down your meter and find the open
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Old 09-23-2018, 09:45 PM   #4
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Are you a homeowner or EC ?


Also call the Hydro to check their side to make sure it is good to go.

That is classic open hot conductor senicearo.

If you are a homeowner just get a electrician come out and let them deal with it this part may not be a diy at all.
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Old 09-23-2018, 09:48 PM   #5
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Please take a few minutes and fill out your profile.
@frenchelectrician will boot you soon if you don't.
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Old 09-23-2018, 09:56 PM   #6
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He's waiting. 100, 99, 98, 97.........Clock is running. He is very stern!
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Old 09-23-2018, 10:23 PM   #7
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ok i figure it out.
im electrician.
one hot was broken, forming a capacitor equivalent circuit on this line. since its 60hz, say left side (A)of this capacitor connecting supply while right side (B)to panel, hence when measuring voltage between B and neutral, yet it shows about 120v, however if measure between B and another hot, B will be almost in phase with another hot wire, end up with only a few volt.
when connecting to load, this wire literally become open circuit hence voltage zero on load
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Old 09-23-2018, 10:32 PM   #8
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ok i figure it out.
im electrician.
one hot was broken, forming a capacitor equivalent circuit on this line. since its 60hz, say left side (A)of this capacitor connecting supply while right side (B)to panel, hence when measuring voltage between B and neutral, yet it shows about 120v, however if measure between B and another hot, B will be almost in phase with another hot wire, end up with only a few volt.
when connecting to load, this wire literally become open circuit hence voltage zero on load
Ok then please fill out the profile as I post the link below.,
http://www.electriciantalk.com/f3/at...fields-258186/
Merci.
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Old 09-23-2018, 11:46 PM   #9
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hi, the link doesnt work
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Old 09-24-2018, 12:14 AM   #10
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Quote:
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hi, the link doesnt work
Just let ya know I got the link fixed now so you can hit it anytime ., sorry about that.,,
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Old 09-24-2018, 01:26 PM   #11
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Just let ya know I got the link fixed now so you can hit it anytime ., sorry about that.,,
I had the wrong one too Marc. Hax caught it and let me know. You must have had the test version which is not available to the community.
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Old 09-24-2018, 02:59 PM   #12
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I had the wrong one too Marc. Hax caught it and let me know. You must have had the test version which is not available to the community.
Ya almost there but the issue was the HTTP it was double that how my oringal one messed up and took me a second to figure out why it went wrong.
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Old 09-24-2018, 09:37 PM   #13
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Quote:
Originally Posted by [email protected] View Post
ok i figure it out.
im electrician.
one hot was broken, forming a capacitor equivalent circuit on this line. since its 60hz, say left side (A)of this capacitor connecting supply while right side (B)to panel, hence when measuring voltage between B and neutral, yet it shows about 120v, however if measure between B and another hot, B will be almost in phase with another hot wire, end up with only a few volt.
when connecting to load, this wire literally become open circuit hence voltage zero on load
well thats nifty that now you know why readings were confusing

so did you fix it? where was it broke?
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Old 09-25-2018, 01:24 PM   #14
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This going no where. So I'm closing it.
OP.....This does not affect your account. So fill out your profile if you still want to participate....Thanks
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