Ground loop

[joeypb89]

I Was hooking up florecent lighting to a temp panel and the temp panel is fed from another finished building . I hope you can view the videos on my Google drive below and you can see what is happening. Is this what they call a ground loop?Didn't use a volt meter but both was safe to touch.why does this happen?
Also everything is hooked up fine and works fine.
https://drive.google.com/file/d/0BwsR7koMMMk2bkdtMG0xUERHOFE/view?usp=drivesdk
https://drive.google.com/file/d/0BwsR7koMMMk2VWRpS0RmZ2YzZkU/view?usp=drivesdk

 

[ActionDave]

How were those wires made up on the other end?

 

[ptonsparky]

Neutral bonded to the can that is sparking as well as the other end of the wire making a parallel path for neutral current. Or some similar situation.

Good demonstration as to why the neutral and EG are bonded at one point only.

Clamping an amp meter around it would tell you just how much current is flowing .

Putting youself in series between the can and wire could have given you an eye opener.

 

[joeypb89]

The other end was to the florecent lighting which isn't attached to any other source , that panel is the source and they work fine, and the hot wasn't even hooked up when I was doing those things

 

[GoldDigger]

The other end was to the florecent lighting which isn't attached to any other source , that panel is the source and they work fine, and the hot wasn't even hooked up when I was doing those things

Fluorescent lighting can generate a significant capacitive current into the EGC, but only when it is on.
Possibly there was an incidental building ground connection at the luminaires and the EGC at the panel is offset from remote earth by current flowing on it from other circuits? Possibly a compromised neutral somewhere as well?
It would be helpful to know both the current and the voltage.

 

[ronaldrc]

Fluorescent lighting can generate a significant capacitive current into the EGC, but only when it is on.
Possibly there was an incidental building ground connection at the luminaires and the EGC at the panel is offset from remote earth by current flowing on it from other circuits? Possibly a compromised neutral somewhere as well?
It would be helpful to know both the current and the voltage.

Maybe Voltage Drop would be my first guess.

 

[ronaldrc]

Maybe Voltage Drop would be my first guess.

Am I to assume it was voltage drop, or is it because every one lost interest in this post
because I posted on it?

Please let me know would not be the first insult I have received on this forum.

 

[ronaldrc]

Am I to assume it was voltage drop, or is it because every one lost interest in this post
because I posted on it?

Please let me know would not be the first insult I have received on this forum.

Just noticed this post is several days old and the OP never returned with the answer.

And I'm taking my foot out of my mouth now.

Sorry