- No neutral wire for lightswitch
The smart switch has wifi, and connects to Amazon Echo, therefore it uses power and requires a neutral wire, according to the manufacturers.
Same problem I had when I put in a smart thermostat, had to run a new 4 core cable to replace the 2 core switched live one, PITA as it involved taking up floorboards etc. Worse for a light switch if it’s in a wall, as you’ll need to re-plaster over the new cable….Posted 2 years agonickjbMember
As Flaperon said, is the box actually doing the switching as well, ie does it need neutral, live and then a switched live to the item being switched on/off? If the switching is done elsewhere with another device then you could shuffle the wiring around at the ceiling rose but I suspect it does do the switching so you’ll need another core. If the existing 3 core cable is in oval conduit you might be able to use it to pull a bit of 4 core through instead but you’ll need access to the void probably by lifting the floor above. If not then things are about to get messy. Whatever you do make sure the neutral comes from the same circuit. Borrowed neutrals are dangerous.
Edit: just seen the update. Probably just as easy to move the switch to the proper location. Similar amount of work and you end up with a proper solutionPosted 2 years agonickdaviesSubscriber
You need to add the neutral into the switch, no easy way of doing it really you just have to do it properly and rewire the lighting to give neutral at the switch. Lot of work for a smart switch, be as easy just to fit a switch in the right place.
You essentially need a dimmer switch for uk lighting, as the small residual current powers the switch. A proper on off switch can’t power itself from the circuit. Easiest would be send your switches back and get wifi dimmer switches – they’re not cheap at about £35 each but a lot less than it’s going to cost to redo the circuit.
Or, even easier and will work with Alexa forget the switches and fit wifi bulbs.Posted 2 years ago
You “should” have a 3 core flex in the switch.Posted 2 years ago
A live in, switched live back up to the rose and an earth.
Obviously the correct way is a new 4 core flex to add the neutral.
Assuming you aren’t planning on selling the house any time soon and/or with the new remote kit in place then just use the earth as a neutral.
It’s only there for the metal back box and isn’t really necessary as it is earthed to the building fabric anyway.
Sleeve it with the appropriate colour and save a shit load of mess.captain_bastardMember
3 core flex as above is indeed the standard arrangement for switches (some old houses and very latest aside)
Nothing stopping you from using the earth for the N, providing the switch is a class 2 earthed device (plenty of older houses without earth to light fitting rely on this)Posted 2 years ago
please don’t use the earth as a neutral ! The continuity of the earth is pretty important in any circuit! Regardless if the earth can or can not be connected to a back box or switch! Most installs will be in T&E lower diameter cable for the earth! Not insulated in the same way as live an neutral conductors!Posted 2 years ago
Supply to switch is how it’s been done everywhere else BUT the uk for a long time.Posted 2 years ago
Only here do we have the archaic practice of T&E, ceiling Rose, etc.
Conduit, single EQUAL conductors, modular switches , schukos and more make the uk way behind.
Let’s not get started on the 3 pin plug….
Or ring manis…
That was deemed good practice
So it’s changed? Seems a pretty risky thing to change…. but then, it seems people don’t know how it works anyway so I guess it makes no difference 🙂
So if there is a live feed to the switch, is there a spur off the wiring in the ceiling void then or what?Posted 2 years ago
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