What size wiring does it call for?

If wired with the two 60A circuits, you will need either a 4 AWG or 6 AWG depending on how long the run for the wire is. If wired using a bus bar or a single point wiring kit, you will need either a 2 AWG or a 1/0 AWG depending on the run. However, a local electrician will be able to answer this much better because what can be used versus what the electrical code for your area is can vary.

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