FAQ
TL;DR: Standard twoâgang can spacing is 72 mm; "The outer dimensions of the Sonoff are 86mmx86mm." Plan wiring and fit before voice-control setup. [Elektroda, xury, post #18312646]
Why it matters: This FAQ helps homeowners choose a smart switch and wiring approach that actually fits and supports voice control, especially in kidsâ rooms.
Quick Facts
- Sonoff T2/TX touch switches need a neutral at the wall box to power the electronics. [Elektroda, xury, post #18308637]
- Typical double-frame spacing is ~72 mm center-to-center; Sonoff faceplate is 86Ă86 mm, so dual installs need box rework. [Elektroda, xury, post #18312646]
- LIVOLO touch switches with remote can work without a neutral, useful in older installations. [Elektroda, alster1, post #18308633]
- If boxes are too tight, you can surface-mount a Sonoff near the door instead. [Elektroda, retrofood, post #18308845]
- B-Line glass touch switches need a Broadlink hub for smartphone control; otherwise theyâre remote-only. [Elektroda, Anonymous, post #18329694]
How do I control a Sonoff T2 EU light switch by voice?
Users report Sonoff T2 works with Google Home. You can keep stock firmware (eWeLink ecosystem) or flash Tasmota and integrate via Domoticz or NodeâRED for voice routines. The Tasmota route needs a controller running 24/7. Pick the path that fits your skills and hub setup. [Elektroda, xury, post #18308637]
Does the Sonoff T2/TX require a neutral wire?
Yes. "T2 requires neutral to work," so confirm a neutral is present in your switch box before buying. Without it, the device wonât power up. If neutral isnât present, consider alternatives or rewire. [Elektroda, xury, post #18308637]
I have a new installation. Do I definitely have neutral at the switch?
No. A new build doesnât guarantee neutral in the switch box. It depends on how the lighting circuit was run, often with neutral at the junction box. Also, donât confuse neutral with protective earth. Verify conductors before installing smart switches. [Elektroda, xury, post #18308662]
Will a Sonoff T2 fit in a multi-gang frame with standard boxes?
Often no. Standard two-gang spacing is about 72 mm center-to-center, and the Sonoff face is 86Ă86 mm. Thatâs a 14 mm shortfall, so two units typically wonât sit side by side without widening or separating boxes. Measure first to avoid rework. [Elektroda, xury, post #18312646]
Can I surface-mount a Sonoff switch if the box is too tight?
Yes. You can place the Sonoff on the surface, for example behind a door, to bypass cramped multi-gang boxes. This avoids chiseling and preserves the frame system for other switches. Use proper routing and a safe enclosure. [Elektroda, retrofood, post #18308845]
What if I donât have neutral at the switchâwhat are my options?
Choose a model that doesnât need neutral, like LIVOLO remote-control switches. Youâll gain remote switching without rewiring. If you want WiâFi voice control, plan for adding neutral or using a different topology and hub. Match the product to your wiring. [Elektroda, alster1, post #18308633]
Do Sonoff TX/T2 switches work with a 5 GHz WiâFi router?
They connect over 2.4 GHz only. Many dualâband routers support both networks; enable 2.4 GHz SSID and pair the switch there. 5 GHz is not supported by these wall switches. [SONOFF TX Series WiâFi Smart Wall Switches]
Can I add motion-triggered lighting with Sonoff?
Yes. One approach is flashing Tasmota and integrating Sonoff with Domoticz. Then use motion sensors to automate lights and still expose scenes to Google Home. This requires a controller and some configuration. [Elektroda, xury, post #18308637]
How do I retrofit two Sonoff Touch/TX in one location?
HowâTo:
- Measure box center spacing and compare with the 86Ă86 mm Sonoff face.
- If spacing is ~72 mm, separate or widen boxes by ~14 mm total.
- Reinstall, ensuring antenna spacing and clean cable routing.
"The outer dimensions of the Sonoff are 86mmx86mm." [Elektroda, xury, post #18312646]
Can I control a Tasmotaâflashed T2 with Google Home?
Yes, indirectly. Flash Tasmota and integrate with Domoticz or NodeâRED, then link to Google Home. This adds flexibility but needs a running controller and more setup than stock eWeLink. [Elektroda, xury, post #18308637]
Do Google smart speakers support Polish with this setup?
One user notes their Google speakers didnât support Polish at the time, limiting native-language voice control. You can still operate in supported languages while waiting for local language support. [Elektroda, kood, post #18310113]
Do I need a Broadlink hub to control a B-Line touch switch by phone?
Yes. Without the Broadlink module, the BâLine touch switch works only from its handheld remote. Add the Broadlink hub to gain smartphone control and scenes. [Elektroda, Anonymous, post #18329694]
Why does only button A work on my twoâgang BâLine switch, while B does nothing?
Your description suggests the B channel isnât connected to a load or is bridged with A when both are pressed. Since a replacement behaved the same, wiring is the likely cause. Verify L, L1, and L2 terminations and that the chandelier circuits are separated. [Elektroda, pawelsake, post #18349915]
What if there isnât space next to other switches for a Sonoff?
In multi-gang frames, box proximity can block a Sonoff Touch from fitting. âThere simply isnât enough space.â Consider separating boxes or surface-mounting the unit nearby. Plan antenna spacing if installing multiple WiâFi switches. [Elektroda, xury, post #18308662]
