what is meant by the title of this thread, "under house" ??
i think there might be some gray area with 680.21, in general the code sections around bodies of water. a insulated EGC is mentioned many times. i have seen where some have said that insulated EGC would carry all the way back to the panel, so instead of NM-B it was UF-B inside.
what version of NEC does your locale use ??
Branch Circuit Wiring
If installing raceway on buildings, you can use electrical metallic tubing. Within buildings, you can use electrical nonmetallic tubing, Type MC cable, electrical metallic tubing, or Type AC cable. These must contain an insulated equipment grounding conductor sized per 250.122 but no smaller than 12 AWG [680.23(F)(1)].
however, this quote might be in context of "on buildings" and specifically related to the type of allowed wiring being mounted to the building on the inside walls/ceilings where the pool stuff is inside the building. not 100% sure.
the insulated EGC is for a reason, and from my view it should carry all the way back to the panel, UF-B should suffice to meet that requirement for the wiring inside the home, etc.