Nothing. It's wired directly to a 120v plug. I did take the time to calculate the correct length of heating wire needed for a given current. The heating wire will have a listed ohms per foot (or per meter) rating. I targeted 1800W so I can use it on a standard 15A circuit. That's a standard ohms law calculation. V=IR Or V/I=R So 120V / 15A = 8 Ohms. If i recall, the wire I had was around 0.25 ohms per foot. So that means that a 32' length makes 8 ohms. I folded it over twice to give me a 8' length with 4 heating wire conductors that were physically arranged in parallel, but electrically in series.
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