Hot tubs come in various sizes ranging from the cute, two person “Soft Tub” to the very large multiple person party units.
120 Volt Units
Some of the small tubs have a 120V 20A power requirement, which means that you can just plug them in to a handy receptacle. I have even seen large tubs set up for 120V power supply. When this is done it takes forever for the tub to warm up due to very little amount of power flowing through the heating elements, I do not recommend this way of installation for the large units.
A note of caution here is that the tub will consume most of the circuit capacity so that if you use something with appreciable draw (hair dryer, microwave or other appliance or electric tools) the circuit breaker can be tripped. This is why it is best to run a separate circuit for the hot tub no matter what size it is.Get more informations of MG Pools
240 Volt Units
Let us start with the two fixed placements.
1) Where is the electric service panel? Preferably the main panel since we will be pulling around 50 Amps of 240 Volt power. It is usually located near a front corner of the house.
2) Where is the hot tub located? Most times this will be located in back of the house.
Power to the Hot Tub
1) Where is the hot tub? Is it on a deck connected to the house or on the ground?
2) Is the house on a slab or is there access under the house?
House and Hot Tub on slab
Let us start with the house and the hot tub on a slab. This scenario tells us that we will need to run the whole power supply line in 1″ Schedule 40 PVC conduit in the ground 18 – 24 inches deep depending on jurisdiction. Above ground it has to be in Schedule 80 PVC.
We run the conduit from the main panel down into the ground to the back of the house where we come out of the ground and enter the GFCI disconnect/Spa Pack.
Note: the above is for a surface mounted panel, if yours is flush mounted (or in the wall) then you will need to use two 45 degree sweeps to get into the bottom of the panel. This is quite easily doable, and chalking fills in any excess opening created during the installation process.
The power to the hot tub is required to be Ground Fault Circuit Interrupter protected (NEC 680.22 -A5). This GFCI protection panel (Spa Pack) is to be not closer than 5 feet from the hot tub, yet within site of the unit no gates or walls (NEC 680.24 -B2b).
The conduit then runs back into the ground and out to the hot tub where it re-emerges from the ground. The power feed into the hot tub is usually on the left side of the unit facing the removable access panel. Some units have built in PVC flex conduit leading to the power panel. If your unit does not have the flex already installed then you will need to install some 1″ PVC Flex.