Wiring a Hot Spring Bengal Spa / Hot Tub
January 2, 2008
I wired a Hot Spring Bengal spa / hot tub the day after Christmas. I don’t usually work the day after Christmas, but this was a favor for a friend. This was a “quick and easy” installation, it took me approximately 2 1/2 hours.
I took advantage of the opportunity and took pictures to share with you on how to wire a 240 volt hot tub. Because of the potential danger of electrocution in a hot tub, all hot tubs are required to be GFCI protected. If you are going to wire your hot tub yourself, I highly recommend having an electrical inspector or licensed / qualified electrician look at the installation upon completion and before you use it. That being said, let’s get on with the installation.
So, the first thing I did was show up and assess the project. As you can see in the image it is snowing. This is just one of the challenges of working in the mountains in Montana. Click on any of the images below to see a larger view in a new window.
So, the hot tub is in place and the electrician that wired these condos already pre-wired for a future hot tub. This hot tub requires 50 amps at 240 volts to the disconnect. Something that Hot Spring spas does different than other spa manufacturers is they separate the pump and heater loads.
The previous electrician left a 6/3 NM cable (romex) with ground. According to the National Electrical Code® (NEC®), this cable has a maximum ampacity rating of 55 amps @ 240 volts.
The first thing that I did was remove the PVC junction box…
and install the disconnect that was included with this hot tub.
The next step is to install the conduit. For this installation, I used 3/4 inch EMT with steel compression fittings. You are required to support EMT within 3 feet of a connector, coupling or box and every 10 feet thereafter.
After the conduit is in place, I pulled my wires. I installed 3 – #10 THHN stranded copper wires and 3 – #12 THHN copper wires. Another point that I should mention is the flexible conduit that I used. In the image below, you will see an odd connection and then the flexible conduit connection to the spa junction box. This is used to absorb the vibration that the hot tub causes when running and it makes the connection to the hot tub junction box easier.
After the wires are pulled, I made my connections at the hot tub first. When working with electricity, you always need to think safety first so you don’t get hurt or electrocuted. I’ve had too many people turn on the power when I’m working on something. Now we use strict “lock out tag out” procedures to ensure no one gets hurt. As a homeowner or DIYer, I recommend working back towards the power source when making your connections. If you connect your power source last, then no one can turn it on while you are working on it. You should also connect your ground first, then the neutral and finally the hot wires.
Finally, I made my connections at the hot tub disconnect.
Before you turn on the disconnect, make sure there is water in the hot tub or you will ruin the heating elements. Typically, the hot tub supplier will start the tub and add the chemicals.
Do you need assistance with your electrical wiring project? Please visit my DIY Electrical Wiring Help from a Master Electrician page. Where I provide electrical wiring tips, expert electrical advice, answers to your electrical questions and electrical consulting & design services over the phone, via instant messenger or via email.
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