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  1. Moonwalker20

    Different AC voltage in multicore cable

    I wanna control (reduce) the speed on my AC duct fan by inserting a variac between the mains and the duct fan. The duct fan is currently connected to the mains (230v) in a junction box close to where I wanna install the variac (3 meters). The variac has 4 connection-pins: L - mains N - mains...

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