So im remodeling and found out my electrical conduit that carries my lines from the my garage was rotted out. I had exposed electrical wires, still wrapped in sleeves, but exposed buried in the dirt. The lines came from my detached garage, providers Meter to a main shut off Breaker and then inside the house to a panel. My question is, If when i replace all the metal conduit with Sch 80 pvc pipe, is the white neutral act as a ground? The neutral is hooked up at the main service box to the grounding rod using a #6 solid copper wire. so it goes Grounding Rod > White Nuetral #2 wire > Panel in House ? DO i need to run a #6 from my In house panel to the grounding rod in my detached garage? using the schedule 80 pvc?