NM-B under house for hot tub installation

[FionaZuppa]

If I had to guess it is because no one has put in a proposal to allow it laying out the hardship created by using a insulated EGC in PVC.

i was looking at it from the other way, why is bare copper allowed if in a cable?

 

[iwire]

i was looking at it from the other way, why is bare copper allowed if in a cable?

It's not bare, it's covered.

Unless you can track down the ROPs that lead to the present requirements you will never really know why.

I can sleep fine without ever knowing the answer to this.