I'm wiring a 240V/60A hot tub which requires 3 conductors; one of these conductors is ground. No neutral is run to the tub. That said, I have a red, black, and green running to the hot tub from the spa disconnect panel.
From the main service panel, I'm trying to confirm whether or not I need to run a neutral to the spa disconnect panel. Which configurations are valid / invalid below, and are there other configurations I should consider? I have a hunch only configuration #3 is correct with respect to the ones below, but please confirm.
Notes on diagrams:
- There is a load neutral terminal on the GFCI (colored in purple in the pictures below). Since the hot tub does not require neutral, I believe this should not be wired in any case.
- Only the neutral wire differs between configurations. The black, red, and green positions are consistent.
Configuration #1
No neutral from the main service panel to the spa disconnect panel. Wire the pig-tail neutral from the GFCI into the neutral bar.
Configuration #2
No neutral from the main service panel to the spa disconnect panel. Wire the pig-tail neutral from the GFCI into the ground bar.
Configuration #3
Run neutral from the main service panel to the spa disconnect panel and terminate it at the neutral bar. Wire the pig-tail neutral from the GFCI into the neutral bar as well.