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Hello my name is ***** ***** evening. Is this an indoor or outdoor spa? Does it come with a remote panel and wiring? Or what does it have for connections?
Ok. Well you would probably want to go with a 30amp breaker and 3 conductor #10 wire, red/black/white and a ground. So you would have to install a standard 2 pole 30a breaker in your main panel, and feed a spa panel minimum 5 feet away and in sight of the spa. Inside the spa panel will be your 2 pole gfci breaker which will feed the spa. Also out of that panel you will need a 120v gfci outlet that is 10-20 feet away.
Oh ok perfect then. The 120v outlet does not need to come out of that spa panel, sometimes it is just handy. Your outside plug may already be gfci protected, if not, just change it. Basically a convenience plug i think, for maintenance, radio or lights or whatever.
You said your spa is 4kw, so 4000Watts divide by 220 volt = 18.2amps. A 30 amp feed gets the job done.
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