Hot Tub Wiring Diagram - Electrical Repairs Electrical This information serves as a typical Spa or Hot Tub wiring diagram to help inform you about the process and electrical wiring components. This article contains general information and does not focus on, or is it specific to one particular make or model. There may be variations between this information and the specific spa you choose to purchase.[PDF] Ow ners M anual - arcticspas engineered for the worldÕs harshest climates¨ av ailab le on www icspas Ow ners M anual International How to Wire a Spa - Wiring for 120V and 240V hot tubs Installing our Backyard Spa Now let's take a look at a typical backyard installation. In our movie below, we've already poured a level cement slab and placed our Belize portable hot tub on it. For a quick, easy, and lower cost alternative to concrete, check out Handi Spa Pads. Per the owner's manual, our hot tub requires a 240V, 50 amp 4-wire electrical hook-up, using AWG #6 copper wire.