The way to have v hot tub electrical installed is to contact your local electrician. Following is information to understand the process but under no circumstances is intended to be a how-to for non-electricians as working on any electrical appliance including hot tubs can be extremely dangerous if proper procedure and precautions are not taken. Whether 50A or 60A is required depends on the number of pumps and size of heater in the spa. For most exterior spas, the electrician will run a 4-wire number 6 or number 8 wire to the spa location. The size of the wire to be used is determined by the maximum current draw of the hot tub, the length of the wire run and the NEC or local codes.