Arcing or Corrosion

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Shujinko

Shujinko

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I have an existing installation with a clear NEC violation of the tap rule 240.21(B)(3). An existing switchboard feeds a transformer which is over 25' away. The primary feeder connects directly to the Switchboard Distribution bus without any over current protection. There isn't any over current protection on the primary or secondary side of the transformer to protect the conductors. Where the XFMR primary feeder connects to Switchboard bus there looks to be corrosion, however I wanted to get this forum's opinion if this is only corrosion or if some arcing burn marks are present as well? Looks like just corrosion but I am not an expert either. See pic below. I need to make the owner aware of the code violation but wanted to see whether to include any mention of corrosion and/or arcing on the Switchboard Distribution Bus.
 
Looks like arcing. Previous sparky cut off the damaged terminal and re-terminated with new bolt, moved to a cleaner hole. See the radial discoloration on the far left part of the discoloration as evidence of arcing vs. corrosion.

What does the inside of the panel cover look like ? Should be able to see evidence of an arc there, even if it was only 'soot' and then cleaned up some.


Could not see the crimp sleeve of the other 2 phases, but sometime you can verify different crimp tools used by the crimped area. Unable to see any arc evidence on the cable though, maybe replaced that cable?
 
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