Based on the answer to my recent question "How to wire a 240V disconnect panel for spa that does not require neutral", I need to run another wire from my main service panel to my spa disconnect panel to serve as neutral.
I began wiring already and noticed my problem halfway. Oops.
- I have three 6 AWG wires running from my main panel to my 60A spa disconnect panel:
- hot red
- hot black
- grounding green
- All are THHN/THWN-2 rated
- In locations where conduit is required, I'm using 3/4" liquidtight flexible nonmetallic type-B
Re-purpose the grounding wire and make it my neutral instead. I would then need to run an additional wire for ground.
My goal is to run the new grounding wire in the same 3/4" conduit I already have if possible. After reading NEC table 250.122, the grounding wire requirement for a 60A panel is 10 AWG copper.
I would put white tape (and a note) around the re-purposed green wire to prevent future confusion.
- Can the grounding wire be bare if it's in conduit, or does it also require THHN/THWN-2? There are wet locations along the run.
- Can I run the new 10 AWG grounding wire in my 3/4" conduit which already has three 6 AWG wires?