Repair of "nicked" Romex sheathing


I noticed that there is a small nick in the plastic sheathing of a run of Romex cable in my basement (it was installed & reportedly inspected by a licensed electrician about 4 years ago).
The bare copper ground is clearly visible through the nick but the other conductors *appear* to be intact.
Does the NEC allow repair of such a nick or do I need to call the electrician back in to replace the entire run?
If repair is allowed, what needs to be done to make a safe & legal repair?
Thanks!
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Wrap with electrical tape.

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A wrap of black tape will fix it just fine
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I too noticed a wire nick. I replaced the wire, cheap insurance from an electrical fire.
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