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Old 07-05-2013, 02:12 AM   #1
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Electrical panel

I added a sub panel in my garage. I found that on the main pane,l the bus bar to the box is energized @ 120 v. The neutral bar to the box has no current. Any thought on why I'm getting power between the bus bar and the box or how to best trouble shoot?


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Old 07-05-2013, 06:37 AM   #2
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Electrical panel

Do you mean the buss where the breakers stab into?
If so, it's because the box is bonded to the neutral (grounded conductor) in the main box.

This way, if the box comes in contact with an ungrounded conductor, it'll trip the breaker.

Therefore, no problemo

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Old 07-05-2013, 11:38 AM   #3
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Electrical panel

I had that sneaky suspicion after researching it last night. I wasn't 100% certain and was worried something was wired incorrectly or I had a chaffed wire. Thanks for your input, I'm feeling much more comfortable.
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Old 07-05-2013, 01:40 PM   #4
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Electrical panel

Are you sure the neutral has no current? I am guessing you mean that you measured the voltage on the neutral and measured zero volts. Under load, the neutral is going to carry the difference in current between the two 120V legs in your panel. Since the legs are rarely exactly in balance, under virtually all circumstances you should measure current on the neutral, although voltage should be close to 0 (the neutral is at ground potential, which by ordinary definition is assumed to be 0 volts).
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Old 07-07-2013, 05:22 PM   #5
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Electrical panel

Yes Daniel, you are correct in your assumption. When measuring voltage from neutral to the panel, I was getting 0.
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