Yeah, you will have (2) live wires, one is L1, the (low speed terminal), and the other is L2, the (high speed terminal) but you can only configure one them if you don't have a external speed switch. But if you do have a external speed switch, both L1 and L2 go to the dual ESS and the live lead on the on/off switch goes to in-line ESS connector. But you can also use a standard 3 way toggle switch instead of a ESS so you can have both low/high speeds available to you.