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Summarized NECHot leads can be any color other than Grey, white, or green. Both hot leads can be the same color as long as they are not grey, green, or white. Or they can be different colors. Both mine are black.Neutral must be white or grey. Ground must be green, and must be insulated in most cases.Your spa panel should have the neutral and ground bars unbonded in most cases. In your main feed panel, your ground and neutral are probably bonded, in your sub panel, in most cases the ground and neutral are not bonded.If in doubt, check with a quailified electrician. Spa and pool wiring has a lot if gotchas, and is not a good place to learn wiring. Brewman
Thanks for the clarification. I don't have my current resources at hand, but are there situations where coding wires isn't allowed?