i have a couple single pole switches for which i'd like to have a motion
sensor switch instead. the current switches have two wires connected: a hot
coming into the bottom and then the switched hot going out of the top to the
light bulb. when i looked around at the motion sensing switches it has four
wires (black, red [for the load], white and green) and says it requires a
neutral. i've never come across a switch that has a neutral hooked up to it.
what am i missing here?
Some of these switches require a neutral to power the device itself, some
don't. For example RAB makes a model LOS 800 occupancy sensor which requires
a neutral, and a model LOS 1000 , which does not : Here's a link:
There are some "device type" that replace a switch that do not need a
neutral. They scavange power through the load. There is really no
"off" position on the switch but the electronic load is so low a light
bulb won't light. YMMV on CFLs
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