Circuit size
Most 240V spas need a 50 or 60 amp dedicated circuit; check the manufacturer's plate.
GFCI disconnect
Code requires a GFCI-protected disconnect at least 5 feet from the water and within sight of the spa.
Wire and conduit
Copper conductors in conduit, with proper burial depth for underground runs.
Bonding
Metal parts and the spa shell must be bonded to prevent voltage differences.
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