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good call, never thought of that, I will check it. Its easy to test by removing the pug and its cable from the charger and seeing if the charger then trips the RCD.

Excellent. thats a straightforward and clear response, thank you. I know its not a faulty RCD in the CU as I bought a new one and replaced it with the same result. That was the first thing I checked. I will now check the supply cable from the garage CU with the EV charger disconnected and...

Stop being a smartarse. I am full aware of what the RCD is doing and why. My query is how it seems to function normally with this earth leakage when the RCD is bypassed. Should there not be some other manifestation of a fault? I didnt suffer shock when testing it or doing a test charge on the...

yes, I disconnected all wiring, including all the live wires from the MCBs, and all the neutral and earth wires from the bus bars. I then tested the EV supply cable in compete isolation from all other circuits on the CU. With the EV cable out of the equation, all the garage MCBs via the RCD...

You need to read it again, I stated on the description. "I then went to the garage, as I suspected the issue might be in the CU thats installed there. The garage CU is covered by the RCD in the house, so only has a mains isolator at the garage CU". Again, this is how it always has been from the...

Im not sure an electrician is left having to do so much and to be honest, if he couldn't get to the fault reasonably quickly, given that its clearly either the EV charger, or the cable from the charger to the garage CU thats at fault, Im not sure I would want to pay him to work on the issue in...

Thankyou. I dont think the cable between the garage CU and the charger has developed a fault. Ive inspected the terminals and they are fine, and there are no kinks, rubs or breaks in the outer sheath. It hasnt been moved at all either in the 3 years to cause any sort of breakage. The armoured...

Thanks. You are so helpful.

All there is to see is a mains isolator, and 5 MCBs, 2 for lights, 2 for sockets and one for the EV charger. This is fed by an underground armoured cable from the house CU via an RCD switch. As I said, there have been no issues or even trips over the last 3 years and the EV has always charged...

Thanks for that. But why would it have worked flawlessly for the last 3 years under the current configuration and not now?

I have 2 CUs in my house, box one covering lights/ cooker/ machine etc. The other box 2 is for sockets, garage and a few other things. several days ago, the RCD for box 2 tripped. After spending quite a time checking all the cabling in the box I tried to isolate which MCB the issue might be...

Yes, I'm sure the EV is fine. It holds a charge ok and is only a few years old. I measured the pressure on the Ev bladder with 3 gauges. A new one I bought a few days back, 1 I already had, and the gauge on the tyre inflator I have for my compressor which is a heavy duty forecourt job. All...

The lower PRV was fitted years ago by a plumber who I had called in because our water pressure was causing a lot of noise when running taps etc throughout the house. When he came, he said our pressure was too high and fitted that lower PRV. I did not know the system as I would now to debate if...

John. I have attached the schematic from the Santon cylinder installation manual. It shows the balance cold water connection tee to come after the combo valve and PRV and before the EV tee. I have also attached a photo of the actual set up reflection those instructions with the balanced out...

Sorry John, you have lost me a bit there. The balanced cold is indeed teed off downstream of the combo valve and pressure release valve. Would this not be correct as effectively the cold supply to the shower and the hot supply are both pressurised to the same pressure as the cylinder? Are you...

Another thing that might be worth adding. When I turn off the stopcock to the cylinder as per the above diagram, it turns off the cold water supply to the two showers as well as the hot water. I hadn't picked up on this previously. However, the cold water supply to the 4 sinks and the bath...

OK. I have attached a diagram of the cylinder and pipework in the airing cupboard. The connections are correct, but I have tidied up the routing of the pipework solely to make the diagram clearer. The expansion vessel for instance is a lot higher up than shown here. I hope this provides some...

No. Not in my case. There is no balloon inside the cylinder. The expansion vessel (same thing) is external in this case. My water runs through the tundish worse when the boiler is heating the hot water cylinder. But also does it when the boiler is off. Basically worse when there is higher...

Thankyou John, I'll post up a detailed diagram tomorrow of all the pipework. Cheers.

The E vessel volume is 19 litres, and the cylinder is 210 litres, so it falls below 10% of cylinder volume. Santon supplied a 19l Exp tank with the cylinder, but I think its on the edge of its capacity? The Combi valve is on the mains in cold water pipe which goes into the bottom of the...