+18 Light Switch Neutral Wire References. (ground wires are not shown.) if power comes into the switch box first, the neutral white line from the service panel and the white line. Web the neutral wires are spliced, and a black wire connects to each switch terminal.
Wire up the new switch. We may earn money when you buy through our links. Web the neutral wire from the source is spliced to the white cable wire and continues on to the light.
