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Old 09-19-2008, 04:03 PM   #16
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Is this normal?


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Originally Posted by rgsgww View Post

Do you have a ground rod?
Why would this matter?

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Old 09-19-2008, 06:43 PM   #17
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Is this normal?


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Originally Posted by skipjack View Post
I was just wondering about that too, joed. How do I know what end the charge is coming from?
Read this article

http://ecmweb.com/grounding/electric...uth_grounding/
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Old 09-19-2008, 09:53 PM   #18
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Is this normal?


Have you measured voltage across the open connection? In my experience, it's fairly common to have several amps of current flowing in a ground wire, but when it is disconnected, the voltage across it is low.

Just because it sparks doesn't mean there's dangerous voltage or current. There's a reason the code requires ground wires like this to be bigger than a lamp cord. There's more stray current flowing through the earth than you can imagine, and there's a good chance that in your case, even if you completely disconnect the electrical system from the building there'd still be enough current to cause a spark.

If it's less than 20 volts, and less than 5 amps, I wouldn't be any too concerned.

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