How to add a Sonoff smart relay into a circuit with combined neutral (light and fan)

I have a bit of a challenge installing a sonoff smart relay. I have 4 different options per the wiring instructions: https://preview.redd.it/tv4mqzeh5poe1.png?width=760&format=png&auto=webp&s=ab5b0e8d8e39aa53a39d6782764ea1361542ddb3 However, I have a switch with an always-on fan sharing the neutral. Inside are two seperate circuits of romex 2, which combine into the romex 3 above. https://preview.redd.it/49y9ixvp5poe1.jpg?width=4284&format=pjpg&auto=webp&s=57eeb4192f2a96032944c7d14bb973ac7eaad037 Here is my understanding of the wiring (The fan/light above is an assumption). I've ignore the grounds for simplicity. https://preview.redd.it/7cui0fsr5poe1.jpg?width=559&format=pjpg&auto=webp&s=cd00831253b21775d8fcb6c49d0ed592bd141f56 Can I add the Sonoff relay in-between where the light switch was (red-to-black), and just pull the neutral from the top and pigtail it into the nut below? This may be more of a sonoff question, as I'm unsure this will allow the fan to keep going, or if its even safe to have current through the neutral when the device assumes it is "off". submitted by /u/Nekose [link] [comments]

Mar 14, 2025 - 19:22

How to add a Sonoff smart relay into a circuit with combined neutral (light and fan)

I have a bit of a challenge installing a sonoff smart relay. I have 4 different options per the wiring instructions:

https://preview.redd.it/tv4mqzeh5poe1.png?width=760&format=png&auto=webp&s=ab5b0e8d8e39aa53a39d6782764ea1361542ddb3

However, I have a switch with an always-on fan sharing the neutral. Inside are two seperate circuits of romex 2, which combine into the romex 3 above.

https://preview.redd.it/49y9ixvp5poe1.jpg?width=4284&format=pjpg&auto=webp&s=57eeb4192f2a96032944c7d14bb973ac7eaad037

Here is my understanding of the wiring (The fan/light above is an assumption). I've ignore the grounds for simplicity.

https://preview.redd.it/7cui0fsr5poe1.jpg?width=559&format=pjpg&auto=webp&s=cd00831253b21775d8fcb6c49d0ed592bd141f56

Can I add the Sonoff relay in-between where the light switch was (red-to-black), and just pull the neutral from the top and pigtail it into the nut below? This may be more of a sonoff question, as I'm unsure this will allow the fan to keep going, or if its even safe to have current through the neutral when the device assumes it is "off".

submitted by /u/Nekose
[link] [comments]