Many moons ago, Itead sent me one of their T1UK wall switches. As it had a neutral connection, I put it to one side as our wiring like many other UK homes does not bring neutral to thewall switch. Today the Sonof T4EU1C was brought to my attention as a UK compatible Smart Wifi wall switch that DOES work without neutral (indeed it does not have a neutral connection). I expect I’ll have one of these soon and will give it a good hammering and report in here.
Meanwhile I have two UK compatible Zemismart smart wall switches – one of which just works without issue – with a blue indicator that comes on when the load is LIVE (I think I’d prefer an indicator that comes on in the dark but that’s another matter).
The other unit at first attempt lit up a 6w test LED light which then just stayed on at half brilliance. The switch came with an optional capacitor which when fitted across the load ensured the light (load) worked properly. Of course, putting a capacitor across the load could be easy or near-impossible depending on your access to the load and which wires connects to the switch.
The Zemismart switch that has the capacitor is WIFI (model SM-SW101 – the box says load 1KW incandescent, fluorescent 400w, motor 300w but product says 3-300w but if using LED or fluorescent less than 100w) , the one that doesn’t have a capacitor and yet appears to work just fine is Zigbee (model SM-SW103ZN-1 Zigbee – incandescent 15-200w, fluorescent 5-100w, LED 5-200w) – it will be a little while longer before I can report on the latter as I only just received their Zigbee gateway.
For now I have at least one switch that works with 2 wires (no neutral) and hopefully soon will have the Itead version to compare with at which point I’ll go into this in more depth. And if you are wondering how these can possibly work with no neutral – take a look at this in-depth Smarthouse video below – Jonathan has done a good job here.