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Many of the light switches in my older home are fed power first through the light fixture. The switch boxes have incoming 2-wire setup, i.e. hot (black), load/neutral (white taped black) w/ ground, so not a 3-wire setup, i.e. +traveler (red). Basically this setup:

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I am looking at the Square D Rocker and Slider dimmers, though they appear to be made for more modern homes given the instruction guide. Any insight into whether these dimmers support a power-through-light, 2-wire setup? Both installation indicate a power-through-switch first, and a 3-wire setup.

Square D SQR22603 Slider - https://download.schneider-electric.com/files?p_File_Name=GDE77967.pdf Square D SQR22601 Rocker - https://download.schneider-electric.com/files?p_File_Name=GDE77948.pdf

(the installation pdf guides are available @ those urls as of 2/26/2026)

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    Nothing is neutral at the switch. By code, the white taped black is hot, and the black is switched hot to the light. Commented 2 days ago

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After looking at the the PDF, they should work since they do not require a neutral connection.

Neutral wire/s being required in the switch box is recent code (2008 or 2012) so smart switches can work. Most times they are just left in the box with a wire nut on them and never used.

The white wire with the tape should the always hot wire. The black wire is the switch hot if it was done right in the first place.

Should test it before to make sure.

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