Using the auber 2352 with 240. I used all 10 gauge wiring. I used a diagram that PJ set me up with. PJ was also nice enough to walk me through the control box build. I also wired up a spa panel for gfci protection. The spa panel will plug into a 3 wire dryer outlet and the control box will plug into a 4 wire outlet hooked up to the spa panel. I plan on testing the control box and spa panel this weekend without the elements connected. And test the rtd probe.