Receptacles, light switches, special equipment, and light fixtures all require them, though he added a caveat, noting that some light fixtures will have a junction box already built in.

If you decide to have the new porch light fixture on an existing circuit with capacity, run the wire to the nearest light ...

Without neutral wiring, older two-wire junction boxes aren’t able to deliver power to a smart switch when the switch is off, hence the need—up until now, anyway—for a wireless hub when using ...