You could, but it’s not recommended. Electrical code requires a certain thickness of wire for hot tubs, and 8/3 wire is too thin.
You might end up with an electrical fire. It’s best to use the recommended thickness of wire for your hot tub to avoid any potential problems.
What’s The Best Wire For A Hot Tub?
The best wire for a hot tub is 4/0 AWG.
This wire is thick enough to handle the high electrical load of a hot tub, and it’s also heat resistant.
4/0 AWG wire is the thickest wire that’s commonly available, so it’s the best choice for most applications.
If you’re using a smaller hot tub, you might be able to get away with using 6/3 AWG wire.
This wire is still thick enough to handle the electrical load of a small hot tub, but it’s not as bulky and difficult to work with as 4/0 AWG wire.
In general, it’s always better to err on the side of using a thicker wire than necessary.
That way, you can be sure that your hot tub will have enough power, and you won’t have to worry about any potential safety hazards.