QUOTE(Oltromen Ripot @ Oct 26 2022, 01:14 PM)
@anyone,
with reference picture.
i have a lot of these switch pairs inside my home.
which i have already ascertained that each multi-gang switches and each 20A switches are connected to different circuit breakers. so in the reference picture alone, there are 2 breakers involved.
all the multi-gang switches does not have their own neutral. only 20A switches do.
(all 20A switches have their own not-shared exclusive breaker, for avoidance of doubt.)
question:
is it possible for me to buy multi-gang tuya wifi SMART switches WITH its neutral line connected to the 20A's neutral line instead?

You can loop the neutral from the 20A double pole to use with your multigang neutral switch. However, thereās some safety concerns with that. Assuming that neutral cabling is not looped, meaning each and every circuit is connected directly from the respective DB to the fitting (in this case the 20A double pole), then whenever you want to carry out maintenance on your multigang switch or change the multigang switch to another switch, then you need to turn off your 6A lighting MCB and also the 20A MCB (for the double pole) before you carry out maintenance. Because if you just turn off the 6A MCB, the neutral from the 20A double pole that was looped over is still live, and may electrocute you.
I think, you can consider to install the non-neutral multigang switches that use the zigbee 3.0 protocol, and they are cheaper when you go with brands under the TUYA OEM umbrella. They can be wired up without neutral, do not require capacitor (so far no issue with mine) and just required a zigbee hub to pair to.
Brands such as Aqara are pricier. Wifi only switches may clog up your 2.4Ghz network. And brands like sonoff, require neutral.
Edit: if you want a one to one replacement for the 4 gang switch, you may still require neutral (some 4-gang switches are sold online, but only wifi, no zigbee). Because zigbee switches are only 3-gang, No 4-gang zigbee switches as of yet. I have a 4-gang switch that i am still thinking of how to settle. I dont want to settle for a 4-gang wifi switch and have to deal with capacitors, rather have zigbee.
This post has been edited by epicure: Oct 27 2022, 01:59 PM