The recommended hot tub wire size is 6 AWG copper. Beginning at the LB fitting, use fish tape to pull the wires from the fitting to the spa panel. Leave at least 6 inches of extra wire hanging from the spa panel.
What wire do I need for a 220v hot tub?
All 220v spas require a 4 wire connection from your main circuit breaker panel. There must be a GFCI disconnect breaker panel at least 5′ from spa and within line of site of spa. Most spas will run effectively on a 50amp 2 pole main circuit breaker. Some spa manufacturers require a 60amp breaker.
What wire do I use for a 240 hot tub?
A large portion of 240V spas manufactured today require a 50 amp 4-wire electrical service. Some hot tubs have load requirements of 30A or 40A, and a few even 60A.