Hot Tub 4-Wire Circuit

By Dave Rongey - Summary:

How to Wire a 4 Wire Hot Tub Circuit: Electrical Circuit Requirements for Hot Tubs

Guide to Hot Tub Wiring

Electrical Wiring: I am replacing my hot tub and want to know if my existing circuit is the right size, or if the circuit needs to be changed.

  • The original was connected to a 4 wire 60 amp GFCI breaker.
  • The replacement tub only has connections for 3 wire.
  • Can I disconnect the 4th wire from the breaker or do I need to do something different?

This electrical wiring question came from: James, a Homeowner from Harrodsburg, Kentucky.

Additional Comments: Great!

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

How to Wire a 4 Wire Hot Tub Circuit

Application: Wiring a Hot Tub GFCI Circuit.
Skill Level: Intermediate to Advanced.
Tools Required: Basic Electricians Pouch Hand Tools, Voltage Tester.
Estimated Time: Depends on personal level experience, ability to work with tools and install the hot tub wiring.
Notice: Installing hot tub circuit wiring should be done according to local and national electrical codes with a permit and be inspected.

Electrical Circuit Requirements for Hot Tubs

  • Wiring Connections
    • James, double check the terminal block connections and the wiring diagram because most 240 volt hot tubs will require a separate neutral and ground wire.
  • Specific Electrical Requirements
    • The specific electrical circuit requirements will be identified in the installation manual that came with the hot tub.
    • The hot tub electrical circuit requirements in the installation manual will explain the number or individual wire conductors that must be installed for the required GFCI circuit protection.
  • For Your Protection
    • All hot tub electrical circuits must be installed with a permit and inspections.
    • For best results have your Hot Tub circuit wiring installed by a Licensed Electrical Contractor.

More about Wiring a Hot Tub:


  • Hot Tub Wiring Diagram Information
  • Electrical Codes and Details for Spa and Hot Tub Wiring.
  • Essentials for your installation, including the required GFCI ground fault protection and circuit wire size.

Learn How to Wire it Right with my
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» Click here to learn more about Home Electrical Wiring «
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Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all projects.


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