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  1. Electrician

    Smart Switch when no Neutral is available

    So answer me this: Your light has a neutral wire to complete the circuit. Your smart switch requires a neutral wire to power the WiFi (low draw) Older dryers (3-wire) did not have digital controls NEC changed the code for new homes to be 4-wire so that there would be a neutral for the control circuit. It is perfectly legal to run a new dryer (with controls) on a 3-wire circuit, i.e., uses ground to complete the control circuit. What is the difference using the ground to complete the control circuit with a smart switch vs a dryer?