An Overview of Hot Tub Electrical Circuit Wiring and Requirements


By Dave Rongey - Summary:

Electrical Circuit Wiring for a Hot Tub Circuit: The electrical circuit is a dedicated GFCI protected circuit. Many hot tubs required a 4-wire circuit which has a separate neutral and separate ground along with the 2-conductors which provide the 240 volt circuit.


Electrical Wiring for a Hot Tub Circuit

Electrical Question: We have a ThermoSpa Hot Tub Park Avenue Executive outside on our deck that came with the house here in MA.

The hot tub requires 2 – 240v circuits, both 30 amps. It is currently wired with the following:

Main Electrical Panel:
1 – 30 Amp 240V GFCI
1 – 20 Amp 120V GFCI (incorrect, need a 240v)

Sub-Panel near the Hot Tub, outside:
Hard wired with a “big handle” type switch on the side, no additional GFCI, controls ONLY the 240V line.

My questions about this Hot Tub Circuit Wiring are:

Thanks for your help!

This electrical wiring question came from: Kevin, a Homeowner from Marlborough, MA

Dave’s Reply:
Thanks for your electrical wiring question Kevin.

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