According to the National Electrical Code, there are very specific codes for hot tubs, spas, therapeutic pools, spas, hydromassage tubs and pools for therapeutic use. Each one of these can be very different for their electrical installation. So which one do you want? What if you know what you want, but the specifications from the manufacturer are different from the National Electric Code? Which is correct? Since water conducts electricity and could cause serious harm to anyone who enters each of these, it is in the best interests of all to call a licensed electrician or an electrical contractor in Las Vegas or Southern Nevada to have a proper see what you would like to install and what is needed to have a proper installation that is safe and will give years of enjoyment and recuperation.