why is it better? i dun see the difference

No neutral and buy version no neutral. Good to go

i am using the non-neutral type
if you have a choice, then ask your contractor to pull a neutral wire to all switch points lor just in case.
if you use the neutral type xiaomi switches - they are cheaper and maybe can work as repeaters as they are powered by AC mains
or maybe in the future you decide want to change to another brand of switches

Where you want to put this? Can use motion sensor also to be pair with the wall switch

why you always quote wrong person

If you are just looking at the purpose to toggle the light, then there is no difference. You just flip the switch either way to turn on or off the light. If you look at the logic table, the light will be on only if both switches are in same state. Both switches have to be off or on position to turn on the light. If either one switch is in opposite state, the light is off.

For 2nd diagram (3 wire diagram), the switch will behave like normal switch. If you on either switch, the light is on and if the switch is off either switch the light is off. However, if you flip both switches on, the light will be off, but this is unlikely because if the light is already on, why would one wants to flip the switch?

One advantage of the 3 wire system is that you will have access both L and N at either switch if required. You will not have problem to replace with smart switch that require N wire.

I dun see what 2 or 3 wire system. To me both also 3 wires....
I wired mine to always act like its one switch - meaning if i look at the switch (either switch), if it is pressed at the bottom, it is On. And if it is pressed at the top, it is OFF. sorry wrong. As in -
1 1 = 0
0 0 = 0
1 0 = 1
0 1 = 1

But mine is not wired like in diagram 2 . more like in diagram 1 but criss-crossed

Btw there is no neutral in either way in the diagram. Take another look

This post has been edited by idoblu: Nov 8 2018, 09:16 AM

Look carefully. The first one, there are 2 wires connect between two switches. The other one has 3 wires between two switches. Ignore the wire to the lamp because it is on the ceiling

SO, I think you have 3 wire at both switches. It is just that the wiring connection is different. If 2 wires, no way it will behave like normal switch.

Maybe you imagine the wiring differently but it is wired like the 2nd diagram? Maybe can try sketch on paper on possible wiring

thats why i said they are both 3 wires
mine is connected like this. no need extra jumper wires



1 - 2 = On
2 - 1 = On
2 - 2 = Off
1 - 1 = Off

This post has been edited by idoblu: Nov 8 2018, 09:14 AM

Not sure how you count wire. There are only 2 wires between those switches. If you count total wire, then there are 4 wires

I see what you mean. If you cross the wire, you can also make switch looks like normal. It is just that you will not have both L and N point on each switch. The switch will have either L or N only

i count at the switch end la - there are three wires

there is no Neutral either way - where did you see Neutral in both your diagrams from that website?

Hahah sorry, did not notice it you

Ok agreed. I was ignoring the bulb

When they talk about 2 or 3 wires, they are counting the number of wire that interconnect between two switches, not number of wire at each switch.

ok understand now....
that means i have a two wire system - developer save money ma, no need extra wire.
btw UK calls it 2 way switching, US calls it 3 way. how they count 3 way?

It is because the US people want to differentiate the SPST switch with the SPDT switch. Once mounted both switch looks the same and the SPDT switch can be wired just like the SPST switch.

The British called it 2 way because they are talking about using 2 switches to control a single light. The American is looking at the switch side, not the lamp side. So, calling it 3-way switch. Another person would say because the switch has 3 terminal to connect... either one.

but 3 terminals also 2 way switching only
the common cannot be counted ma

In average, Americans are just dumb or simple minded people (true story). The easy way for them to remember is to just look at how many terminal the switch has. The SPDT switch has 3 terminals to connect the wire. So, they just call it 3 way switch. To control 1 or 2 or 3 bulbs are not their main concern here. Wiring is different story. When they go to the shop, they just tell the shop that they want 3 way switch. The convention SPDT (Single Pole Double Throw) is technical term, not layman term.

Correct. And the Yanks call the DPDT switch 4 way because of the number of terminals on the switch. Quantity of lights being controlled is not important.
Wikipedia

Bonus material for using Tasmoto for 3 way switch(US) / 2 way (UK). Applicable for Sonoff T1

The square one new version is WXKG12LM
The round one got no new version so no need to worry - WXKG01LM
They both do about the same thing namely single press, double press and long press except the new version square one has shake also

For shopee, try not to buy from overseas sellers. Nowadays local sellers also quite cheap and shipping is faster

This post has been edited by idoblu: Nov 8 2018, 02:53 PM

Sometimes the shop name has .my to confused you but it is from overseas. There are sellers that said ship from Balakong (for example), but order is actually shipped from China. I guess from China shipped to local seller and then put into PosLaju to ship to you. If not I wonder how they assigned the PosLaju tracking number once the order leave China