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I think I can see your idea? But not how it will work. So in each room, we need a device, not on an outside wall, to detect when it needs heat, both time and temperature. This will cause the TRV to open and the boiler and pump to be triggered. There also needs to be a by-pass valve for when...

Full marks on the review google shows around £50 so not cheap, and the app looks very similar to the Kasa TRV head. Two year battery life is good, the Energenie has a two-year battery life as well. "you also get six adapters in the box, covering Danfoss RAV/RA/RAVL, Caleffi, Giacomini...

The TP-Link (Tapo) smart switch is battery powered, so it does not matter what voltage is being switched. I use one to power an outside lamp which is also PIR controlled, with no neutral to the switch.

I find it takes nearly an hour to re-heat a room. Eco setting 17°C and comfort setting 21°C, so geo-fencing does not work, it takes too long to re-heat the house. The basic idea is, with a modulating boiler, as the TRV closes, the by-pass valve opens, allowing hot water to return to the boiler...

Simple, just plug in, this one has a switch in or out, but will the TV have an out anyway?

It would seem wired for a Y Plan, and that when combi fitted, there has been some corner cutting, as will no longer be Y Plan, so what we look at is how can we gain more control without working out what has gone on in the past. The backplate is universal, be it Hive, Wiser etc, they all use the...

If we were to list all which should be done, then you would never start the job, in the main we all cut corners, not completing paperwork etc. So most will do as you say, but to claim that's all you should do is wrong, but again in the main we don't have the equipment to do it all correctly anyway.

As yet TV not in use, new 55 inch to replace old 42 inch, but there are loads of SCART to AV units, I have used them for years. No electronics involved. To be frank, not used the DVD or Blu-ray player in years. The same goes for CD player, I am sure the CD is better quality, but so easy to say...

Range is the first question, lucky I had smart devices I could try, I took a standard lamp to the shed where the outside lamp is, and tested to see if a smart bulb would work at that distance, and it would. However, the new lamp was BA22d bulb, and I only had E27 smart bulbs in stock, so used...

I had the same consideration, as an industrial electrician I had a spare PLC, and the software and leads to program it. And I was tempered. But thought, when I die, how will my wife get it fixed if it goes wrong. So used standard smart equipment only. I once was working in a factory, and given...

Low voltage 50 - 1000 volts AC, extra low voltage below 50 volts AC. Do you mean extra low voltage? I will guess extra low voltage? So switches using a battery or a neutral, in the main, it does not matter if the current used drops, but switches which get their power from the power being used...

The loop, in through the line wire, which goes to an overload device, and to the device being used, which has an earth fault, so goes to the earth wire back to the supply transformer, and trips the overload, where does the ground come into that loop. Or The loop, in through the line wire...

Typical TT as shown, earth used as a conductor, if earth not used as a conductor, then TN.

The system does have an earth electrode, which is always connected. But the connection neutral to earth is within the system, not at some point on a pole with no earth from the pole to local system, and does not cause the fault current to run through the ground, so it is therefore a TN-S system...

This is what I also thought. It was connected to the internet to use the geo-fencing, and to allow voice commands to adjust temperature. The geo-fencing was a failure, as far too close to home when it turns back on again, and no adjustment for distance. The Nest Gen 3 was a failure, but left...

Yes, This does show how to export to an outbuilding but Autumn 2005 is going back a bit, now we regard a building similar to a caravan the same as a caravan. So a wooden shed could have a TN-C-S supply, but not a metal shed. This has caused problems with some buildings, and one has to use some...

Well it would, as the inverter will detect DNO failure, and auto connect neutral to earth, giving a TN-S supply.

This was part of an email from Nest, but how would it know? The boiler only runs when the return water is cool enough, it does not matter if the thermostat is on, it is when the boiler runs that matters. With a modulating boiler, also how much modulated, so how would they know how I did?

My house is TN-C-S when on the DNO supply and TN-S when the supply fails. But does it matter which? Unless a caravan, boat, or petrol station can't see the problem.

It does raise a question about any class I equipment used outside, but most outdoor equipment is class II, so not a problem. As to why the electric car is not class II, I have never worked out. However, there is a lot more involved with loss of PEN, and to protect the whole house would seem...