# Extension of wires in s1 and s2 **URL:** \ **Category:** Ideas & Suggestion\ **Created:** [February 18, 2025, 12:09am UTC](https://forum.ewelink.cc/t/extension-of-wires-in-s1-and-s2/136667 "2025-02-18T00:09:03Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![antonioosjr](https://dub1.discourse-cdn.com/flex005/user_avatar/forum.ewelink.cc/antonioosjr/32/7250_2.png) [@antonioosjr](https://forum.ewelink.cc/u/antonioosjr)\ **Post date:** [February 18, 2025, 12:09am UTC](https://forum.ewelink.cc/t/extension-of-wires-in-s1-and-s2/136667/1 "2025-02-18T00:09:03Z")
I needed to install a sonoff zbmini L2 1 meter away from the physical switch, therefore requiring 1 meter of wire for s1 and another 1 meter of wire for s2. Could this interfere with the operation of the device? ---
**Author:** ![jam3](https://dub1.discourse-cdn.com/flex005/user_avatar/forum.ewelink.cc/jam3/32/7918_2.png) [@jam3](https://forum.ewelink.cc/u/jam3)\ **Post date:** [February 18, 2025, 7:11am UTC](https://forum.ewelink.cc/t/extension-of-wires-in-s1-and-s2/136667/2 "2025-02-18T07:11:55Z")
Rather not. It is, after all, a galvanic connection and a metre long distance has little effect. You can easily check this by doing a test installation. ---
**Author:** ![antonioosjr](https://dub1.discourse-cdn.com/flex005/user_avatar/forum.ewelink.cc/antonioosjr/32/7250_2.png) [@antonioosjr](https://forum.ewelink.cc/u/antonioosjr)\ **Post date:** [February 18, 2025, 10:24am UTC](https://forum.ewelink.cc/t/extension-of-wires-in-s1-and-s2/136667/3 "2025-02-18T10:24:12Z")
My concern is about electromagnetic induction in wires running in the same conduit, because in this case, the area of ​​influence increases. There is also the problem of two different phases running in the same conduit, one for the sockets and another for the lamps. ---
**Author:** ![jam3](https://dub1.discourse-cdn.com/flex005/user_avatar/forum.ewelink.cc/jam3/32/7918_2.png) [@jam3](https://forum.ewelink.cc/u/jam3)\ **Post date:** [February 18, 2025, 10:28am UTC](https://forum.ewelink.cc/t/extension-of-wires-in-s1-and-s2/136667/4 "2025-02-18T10:28:14Z")
> [@antonioosjr](#): > > My concern is about electromagnetic induction You worry too much 🕶 ---
**Author:** ![antonioosjr](https://dub1.discourse-cdn.com/flex005/user_avatar/forum.ewelink.cc/antonioosjr/32/7250_2.png) [@antonioosjr](https://forum.ewelink.cc/u/antonioosjr)\ **Post date:** [February 19, 2025, 11:57am UTC](https://forum.ewelink.cc/t/extension-of-wires-in-s1-and-s2/136667/5 "2025-02-19T11:57:17Z")
problem solved with larger diameter wires. I had used 1mm and increased it to 1.5mm. ---
**Author:** ![jam3](https://dub1.discourse-cdn.com/flex005/user_avatar/forum.ewelink.cc/jam3/32/7918_2.png) [@jam3](https://forum.ewelink.cc/u/jam3)\ **Post date:** [February 19, 2025, 1:02pm UTC](https://forum.ewelink.cc/t/extension-of-wires-in-s1-and-s2/136667/6 "2025-02-19T13:02:57Z")
> [@antonioosjr](#): > > increased it to 1.5mm Does it really matter? What’s the functional difference? ---
**Author:** ![antonioosjr](https://dub1.discourse-cdn.com/flex005/user_avatar/forum.ewelink.cc/antonioosjr/32/7250_2.png) [@antonioosjr](https://forum.ewelink.cc/u/antonioosjr)\ **Post date:** [February 19, 2025, 1:31pm UTC](https://forum.ewelink.cc/t/extension-of-wires-in-s1-and-s2/136667/7 "2025-02-19T13:31:05Z")
I can’t explain. This was the first time I had to put the device in a separate wall box, due to lack of space. I always used a 1mm cable to connect S1 and S2 to the switch, with a maximum length of 10cm. I believed that all switches, since the first generation of Sonoff Mini, would have a low voltage between these terminals. But I saw that from the 3rd generation onwards they started to have the phase voltage, in my case 220V. So I chose to use a larger diameter wire. I also know that the large difference between the wire gauges running in the same conduit can affect the current that flows through them, due to inductance. This may be a problem specific to the ZBMini L2, due to the lack of neutral. ---
**Author:** ![ociepa.ekotox](https://avatars.discourse-cdn.com/v4/letter/o/c68b51/32.png) [@ociepa.ekotox](https://forum.ewelink.cc/u/ociepa.ekotox)\ **Post date:** [February 19, 2025, 2:35pm UTC](https://forum.ewelink.cc/t/extension-of-wires-in-s1-and-s2/136667/8 "2025-02-19T14:35:44Z")
Sonoff has a new device ZBM5 that can work without a neutral wire. Maybe this will be a better solution for you. Think about it. > **[SONOFF SwitchMan Zigbee Smart Wall Switch | ZBM5](https://itead.cc/product/sonoff-switchman-zigbee-smart-wall-switch-zbm5/)** > > 【Support Both No Neutral & With Neutral Wire】The ZBM5 is designed to adapt to your home’s wiring configuration. Whether or not a neutral wire is available, it can be easily connected and … ---
**Author:** ![jam3](https://dub1.discourse-cdn.com/flex005/user_avatar/forum.ewelink.cc/jam3/32/7918_2.png) [@jam3](https://forum.ewelink.cc/u/jam3)\ **Post date:** [February 19, 2025, 5:26pm UTC](https://forum.ewelink.cc/t/extension-of-wires-in-s1-and-s2/136667/9 "2025-02-19T17:26:52Z")
> [@antonioosjr](#): > > So I chose to use a larger diameter wire. It is highly improbable that the diameter of the wires will have any impact on performance. In this case, these are logic states and not voltage, current or crosstalk issues. In my view, you are addressing a non-existent or negligible issue with an unfounded theory. Perhaps someone else will offer expert opinion. ---
**Author:** ![antonioosjr](https://dub1.discourse-cdn.com/flex005/user_avatar/forum.ewelink.cc/antonioosjr/32/7250_2.png) [@antonioosjr](https://forum.ewelink.cc/u/antonioosjr)\ **Post date:** [February 19, 2025, 5:49pm UTC](https://forum.ewelink.cc/t/extension-of-wires-in-s1-and-s2/136667/10 "2025-02-19T17:49:27Z")
No, I tested the continuity of the wires with a multimeter and everything was correct and I also used insulated crimp terminals. I suspected a defect in the switch, I replaced it, but the problem persisted. I repeat, it must be something specific to the Sonoff mini without neutral. Another problem I noticed is that it does not work by supplying only s1, s2 and Lin. I would only use it as a trigger for the virtual parallel. ---
**Author:** ![ociepa.ekotox](https://avatars.discourse-cdn.com/v4/letter/o/c68b51/32.png) [@ociepa.ekotox](https://forum.ewelink.cc/u/ociepa.ekotox)\ **Post date:** [February 19, 2025, 11:31pm UTC](https://forum.ewelink.cc/t/extension-of-wires-in-s1-and-s2/136667/11 "2025-02-19T23:31:04Z")
> [@antonioosjr](#): > > Another problem I noticed is that it does not work by supplying only s1, s2 and Lin. ZBMINIL2 must have a closed electrical circuit to work. A light bulb must be connected to the L(out) output. ![zbminil2](https://europe1.discourse-cdn.com/flex005/uploads/ewelinkforum/original/2X/9/9234806b538c75b106f0b05b05e0062e2edc989c.jpeg) ---
**Author:** ![jam3](https://dub1.discourse-cdn.com/flex005/user_avatar/forum.ewelink.cc/jam3/32/7918_2.png) [@jam3](https://forum.ewelink.cc/u/jam3)\ **Post date:** [February 20, 2025, 4:48am UTC](https://forum.ewelink.cc/t/extension-of-wires-in-s1-and-s2/136667/12 "2025-02-20T04:48:56Z")
> [@antonioosjr](#): > > it does not work by supplying only s1, s2 and Lin That’s just how it’s made. No surprises there. Maybe give the manuals a glance once in a while 🕶 ---
**Author:** ![antonioosjr](https://dub1.discourse-cdn.com/flex005/user_avatar/forum.ewelink.cc/antonioosjr/32/7250_2.png) [@antonioosjr](https://forum.ewelink.cc/u/antonioosjr)\ **Post date:** [February 20, 2025, 1:14pm UTC](https://forum.ewelink.cc/t/extension-of-wires-in-s1-and-s2/136667/13 "2025-02-20T13:14:33Z")
Yes, and the manual should already come with the device. ---
**Author:** ![jam3](https://dub1.discourse-cdn.com/flex005/user_avatar/forum.ewelink.cc/jam3/32/7918_2.png) [@jam3](https://forum.ewelink.cc/u/jam3)\ **Post date:** [February 20, 2025, 4:57pm UTC](https://forum.ewelink.cc/t/extension-of-wires-in-s1-and-s2/136667/14 "2025-02-20T16:57:30Z")
Your device was without one? How odd. ---
**Author:** ![psestri](https://avatars.discourse-cdn.com/v4/letter/p/e0b2c6/32.png) [@psestri](https://forum.ewelink.cc/u/psestri)\ **Post date:** [February 23, 2025, 11:18pm UTC](https://forum.ewelink.cc/t/extension-of-wires-in-s1-and-s2/136667/15 "2025-02-23T23:18:37Z")
I have installed about 10 sonoff mini r3, had the same problem, s1 & s2 wires 5+ meters long. I have used two 50microfarad capacitors for each device, + poles connected to S1, s2, negative pole connected to Line IN. The only disadvange is a delay in the on/off switching of the load vs the phisical action of changing the state of the wall switch ---
**Author:** ![jam3](https://dub1.discourse-cdn.com/flex005/user_avatar/forum.ewelink.cc/jam3/32/7918_2.png) [@jam3](https://forum.ewelink.cc/u/jam3)\ **Post date:** [February 24, 2025, 7:13am UTC](https://forum.ewelink.cc/t/extension-of-wires-in-s1-and-s2/136667/16 "2025-02-24T07:13:22Z")
> [@psestri](#): > > negative pole connected to Line IN Why did you do that? ![image](https://europe1.discourse-cdn.com/flex005/uploads/ewelinkforum/original/2X/6/6a777124523d81a7dcc19d21c9b48368398dfe90.png) Another issue is that we originally discussed ZBMINIL2. And here the wiring and the way the device is powered is different. Also, the effect of the length of the wires connecting the switch does not really appeal to me. Perhaps @Ward will ask his colleagues in the Sonoff engineering department for a comment. That might be conclusive. ---
**Author:** ![ward](https://dub1.discourse-cdn.com/flex005/user_avatar/forum.ewelink.cc/ward/32/10437_2.png) [@ward](https://forum.ewelink.cc/u/ward)\ **Post date:** [February 24, 2025, 7:15am UTC](https://forum.ewelink.cc/t/extension-of-wires-in-s1-and-s2/136667/17 "2025-02-24T07:15:13Z")
[@Staff-of-SONOFF](https://forum.ewelink.cc/groups/staff-of-sonoff) Please jump in and take a look ---
**Author:** ![ano](https://avatars.discourse-cdn.com/v4/letter/a/838e76/32.png) [@ano](https://forum.ewelink.cc/u/ano)\ **Post date:** [February 24, 2025, 3:26pm UTC](https://forum.ewelink.cc/t/extension-of-wires-in-s1-and-s2/136667/18 "2025-02-24T15:26:00Z")
This is very topical for me right now, but I am considering using the Minir4. What I do not understand is why the device is using line voltage on S1/S2. It’s a trigger to toggle the switch and I would have thought a nominal 3.3 or 5v would have been sufficient to trigger. Doing this would make installation easy as you would not be as problematic as using 1mm or 1.5mm twin and earth. In place of this you could use standard twisted pair telephone wire removing interference. In the mean time, going back to the subject, are you saying the R4 should really be installed close (as in x CM away) from the physical switch? I was considering moving the switch close to the circuit and running the trigger wire to the wall switch. ---
**Author:** ![psestri](https://avatars.discourse-cdn.com/v4/letter/p/e0b2c6/32.png) [@psestri](https://forum.ewelink.cc/u/psestri)\ **Post date:** [February 24, 2025, 8:00pm UTC](https://forum.ewelink.cc/t/extension-of-wires-in-s1-and-s2/136667/19 "2025-02-24T20:00:54Z")
The S1 & S2 inputs are + 3.3V compared to LineIN and, supposing you have a 230 volts mains/power line, they are 233.3 V above Neutral. So, LineIn is negative compared to S1 & S2 and a electrolithic capacitor has to be connected respecting the + and - of the circuit. If you have a voltmeter, you may test the voltages involved. ---
**Author:** ![psestri](https://avatars.discourse-cdn.com/v4/letter/p/e0b2c6/32.png) [@psestri](https://forum.ewelink.cc/u/psestri)\ **Post date:** [February 24, 2025, 8:03pm UTC](https://forum.ewelink.cc/t/extension-of-wires-in-s1-and-s2/136667/20 "2025-02-24T20:03:37Z")
The purpose of the capacitors is to reduce/smooth the interferences originate by the houss electrical wiring. [Next page](https://forum.ewelink.cc/t/extension-of-wires-in-s1-and-s2/136667.md?page=2)