You also can't reuse ground as neutral (that would technically work but be a significant code violation). The 4 wire motion sensor wiring diagram is a simplified conventional pictorial representation of an electrical circuit. Neutrals must match their hots - you can't pull another neutral from a different light (or even worse, a different circuit). The problem is you can't simply "run another wire" - all wires need to be together in conduit (unlikely since if you had conduit then the switched hot should not have been white) or together in a cable, which would require a 3-wire cable instead of a 2-wire cable (ground isn't counted in that numbering scheme).Ĭurrent code requires neutral to be included in switch boxes, but that is a relatively recent change so it is quite common to find switch boxes without an accessible neutral. The end result is that the black/white cable you have at the switch does not contain neutral.įrom your description, I suspect you have the second configuration, and you need to add a wire to get neutral at the switch. Black is hot and connects to another cable (which also connects switched hot to the other side of the light. At the light, white is neutral and connects to the light.
The second cable would have black switched hot and white neutral, with the black switched hot connected to the switch. One would have black hot and white neutral, with black going to the switch and white connected to the white of the other cable. In my case, there is a junction box where the power wires, light wires and 14-2 wire from one of the 3-way switches. In this case, you would typically have two cables coming into the box. Attached is how the wiring currently done. There are two possible configurations of your current switch & light: Load is also referred to as switched hot. The 4 wires you need are ground (all grounds go together, everything has a ground, so we'll ignore that for now), neutral (the problem), hot and load.
A simple (not smart, not dimmer, not motion, not 3-way, etc.) switch will have a hot and a switched hot. Actually, you very likely do NOT have a black hot and a white neutral.
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