NM into junction box

[par20pinspot]

Hey folks, I can't find an answer how to fix my problem. I have a number of junction boxes in the basement that are mounted to the bottom of the joists with the NM having to dip below the joist to enter the box. What is the proper way to protect the cable. I don't want to remount the boxes because a lot of them have conduit running into them as well as unprotected NM. Any ideas?

 

[iwire]

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