Four pigtails emerge from the backside of the switch—line, load, neutral, and ground—each of which must be connected via included wire nuts to the appropriate wires inside the wall.

Other homes, particularly newer ones, have switch-first wiring, where the live and neutral both pass through the switch before making their way over to the light fitting. It’s also common in Europe.

Leviton’s latest smart switch doesn’t require a neutral wire. Jennifer Pattison Tuohy is a senior reviewer focused on smart home and connected tech, with over twenty years of experience.

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GE has a new line of smart switches and dimmers that can be installed in homes that do not have neutral wires, such as many that were built before 1980. The new products provide an alternative to ...