It is in side ( residential ) any code reference PLEASE ?If it is residential install then you can use nm cable for the tub indoor. The only issue is if the manufacturer requires a full size equipment grounding conductor.
try looking at 680.21 for the non insulated EGC in NM cable.It is in side ( residential ) any code reference PLEASE ?
try looking at 680.21 for the non insulated EGC in NM cable.
110.3(B) for when instructions require full sized EGC.