Spa and Hot Tub Electrical Requirements
220-240V Hot Tubs
In general hot tubs are designed to operate on a hard wired, GFCI protected 220-240V 50-60 AMP circuit. There are exceptions that require as much as 80, 90, or 100 AMP circuits if the hot tub has multiple heaters, pumps, controls, etc. like in the case of a dual temperature swim spa (hyperlink), however, it is not common.
It is the responsibility of the spa owner to ensure that hot tub electrical connections are made by a licensed electrician in accordance with the National Electrical Code and any local and state electrical codes in force at the time of installation. Furthermore, it is important to reference your owner’s manual for your specific make and model’s electrical requirements as the information below is very general.
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Most North American hot tub equipment has been manufactured to operate on 60Hz. Alternating current only, 220-240 volts are required. It is important to make sure that power is not applied during the hot tub electrical installation. A copper bonding lug has been provided on the electrical equipment pack to allow connection to local ground points. The ground wire must be at least 6 AWG copper wire and must be connected securely to a grounded metal structure.
The only electrical supply for your spa must include a 50-60 AMP switch or circuit breaker to open all non-grounded supply conductors to comply with section 422-20 of the National Electrical Code. The disconnect, typically housed in a small metal box, must be readily accessible to the hot tub occupants, but installed at least five feet away from the hot tub.
A Ground-Fault Circuit Interrupter, more commonly referred to as a “GFCI” must be used to comply with section 680-42 of the National Electrical Code. A ground fault is a current leak from any one of the supply conductors to ground. For safety reasons, a GFCI is designed to automatically shut off power to the hot tub when a current leak or fault is detected. Power hook-up to the hot tub must be single phase, 240 volt 4 wire (two hot, one neutral, one ground).
The recommended wire size is 6 AWG copper. Route the 4 wires into the equipment area for final hook-up to terminals inside the control panel (hard wired). The spa must be hooked up to a dedicated 220-240 volt, 50-60 amp breaker and GFCI. The term “dedicated” means the electrical circuit for the spa is not being used for any other electrical items (outdoor lights, appliances, etc.).
If the spa is connected to a non-dedicated circuit, overloading will result in nuisance tripping which requires resetting of the breaker switch at the house electrical panel and may be a safety hazard.
Electrical connections made improperly, or the use of incorrect wire gauge sizes, may continually blow fuses in the electrical equipment box, may damage the internal electrical components, may be safety hazard and likely void your hot tub’s warranty. This is why it is important that all work is done by a qualified electrician.
110-120V “Plug-n-Play” Hot tubs
There are also many “plug-n-play” spas that operate on a standard 15-20 amp household circuit. Most of these have a GFCI built into the end of the cord, and plug right into the outlet. It is important to have dedicated line and circuit even with a plug-n-play hot tub due to the constant electrical demand on this circuit.
Therefore, it cannot be shared with any other outlets and cannot support any additional load from things like TVs, appliances, etc. because it can overload the circuit and cause nuisance tripping and potential safety hazards.
Once again, it is important to consult a licensed electrician for a qualified assessment.
Need assistance? Call Black Pine Spas today- (425) 771-5774 Our team is available to answer any questions you have about the hot tub electrical and installation requirements. Click here to ask us anything!