He has concern the neutral support both and worried of overload.
But i have reservation on his experience dealing with smart switches.

The load pull should be minimal only to support the wifi for Sonoff.

I have option of Broadlink, Aqara and Sonoff now.

Broadlink (need hub) not favourable, but no need neutral. Someone mentioned alot problems, but when google seems minimal
Aqara (need hub) no need neutral, I'll need a set of this to replace one of my switch. Hoping can do it without hub.
Sonoff , best looking, no hub, concern on just the neutral.

I have Xiaomi yeelight . Setup is tricky and not easy . So I’m not keen on Xiaomi ecosystem where I can . By the way can I use Xiaomi switches without gateway ? Or the gateway is a must

All the neutrals currently used for AC . Some ac on once a week , some on daily . The switch that pull it is all lights or fan . Lights are led , fan is normal Panasonic

AP frequency should be 20 channel need to double check . I’m not worried in the dead zone yet . This problem worst come to worst I get damn powerful router lol

Ok for me so far. Using for about 10 months now.
Most of the time the gateway don’t even need internet connection in order for your sensors to work as they are connected local to the gateway via Zigbee

Yes need gateway to talk to other xiaomi device, aqara only up to 2 switch but sonoff up to 3 switch, no eorries pull neutral from your ac

If wiring on single phase, should be no problem. If 3 phase house wiring, it may or may not work.

Hello guys, I am considering the Mi smart home system but I think one gateway may not be enough to cover the required area:

1. I suppose we can have multiple gateways in one system right, but must these gateways be in the same wifi network? (my current wifi setup is different floor different wifi)

2. is getting zigbee repeater better option?

All 3 gang, 10 pieces

Lol

How much? PM tepi. 

Both cannot work without the gateway.
Why want to buy additional gateway? Your place too big? Buy Zigbee repeater

Fresh from oven, the neutral on my ac not same phase with my normal switch. All doesn’t work

So I’m shelving my plan now until i can find a nice switch without neutral

If anyone needs Sonoff switches, I have extra for let go .

Electrician tested .yeah exploded and tripped

Don't recommend bro . I'm not convince of this test method

You can test buy leaving both switches u wanna test on . Then turn off each phase in DB
If both off together then you will know

So, your house is 3 phase wiring? Your house has 3 separate RCCD? If one big one with linked switch lever, maybe it is using common N line?

Zigbee devices can transmit data over long distances by passing data through a mesh network of intermediate devices to reach more distant ones.

Zigbee

Yeelight connect using Wifi. So, no it can't

Yes can, just set the turn off the light x min when no motion

So, your house is 3 phase wiring? Your house has 3 separate RCCD? If one big one with linked switch lever, maybe it is using common N line?

For my condo, ac n lighting point circuit dont share the same neutral line. Ur photo wont tell. U need to get electric circuit diagram from developer to study the neutral line circuit.

First picture shows that the GND are connected to 2 copper bars. The reason for two bars is likely because they don't have longer bar for all GND wire in a single bar. There will be wire joining the two bar, I'm sure

The 2nd picture shows that the N wires are separated into 3 separate bars. Looks like the N are going to be separated but it can't be sure just as yet. Maybe they are going into 1 master 4 pole RCCB or 3 separate 2-pole RCCB. If 3 x 2-pole RCCB, then N has to follow phase. Why not just call developer or the guy in charge of the project and ask. The person can tell you for sure.

Malaysia follow UK wiring standard, no neutral for lighting switch. But there is neutral for AC switch, heater switch, switch socket outlets. Hence, not a requirement to pull neutral to lighting switch.