you have a switched supply and a permanent supply, see the switch at lower right, left side is permanent and right side of switch is switched via the black box above, with both cu neutrals joined together in the left henley block
It would seem that your 'Radio Teleswith' not only switches the meter between day and night registers at the appropriate times but also contains a 'switch' (relay/contactor) which switches the storage heaters on only during the cheap/night periods. I presume that the isolator (white thing below the teleswitch) contrails (i.e. allows you to switch off) the storage heaters?.... One interesting thing that I can't get my head round, though. The storage heaters will only warm up at night (if we use them). So if the whole house switches to E7 at night, what prevents the storage heaters from drawing power during the day as well? Their consumer unit must be on some feed that only goes live at night?
I'm not sure that it is necessarily as simple as that. For those concerned about lost TN-C-S PENs, I'm not convinced that the inside of my garage would be appreciably 'safer' ('less of a potential problem') than 'outside'As to the lead I showed, if being charged in a garage no problem using the lead in a 32 amp socket, the problem is charging outside, be it a hot tub or an electric car inside no problem with TN-C-S but outside there is.
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It has surely always been inevitable that, sooner or later, the government will have to find a way of 'charging' for EV usage (whether by a 'tax' on EV charging or something like a 'mileage tax'), to compensate for the progressive loss of income from fuel excise duty?Just posted to my eMail 'box' from the IET.
That white thing is a 2 pole isolator which isolates both the 24 hour power and the cheap rate line but not the neutral. Personally I'd have put it between the meter and henleyIt would seem that your 'Radio Teleswith' not only switches the meter between day and night registers at the appropriate times but also contains a 'switch' (relay/contactor) which switches the storage heaters on only during the cheap/night periods. I presume that the isolator (white thing below the teleswitch) contrails (i.e. allows you to switch off) the storage heaters?
Kind Regards, John
Yes, you're right, and it does seem an odd way to have done it - as you say, upstream of the Henley (and DP) would seem more logical. I suspect that the way it's ended up may be a consequence of the order in which things were done (over the years) and what was 'most convenient' at the time!That white thing is a 2 pole isolator which isolates both the 24 hour power and the cheap rate line but not the neutral. Personally I'd have put it between the meter and henley
That's how ours works. There are two separate consumer units - the normal one and a smaller one that only becomes live during the night. That used to run the storage heaters, but now is useful for running washing machine, dishwasher, dehumidifier, or anything else that can with advantage be run at night on cheaper electricity.So if the whole house switches to E7 at night, what prevents the storage heaters from drawing power during the day as well? Their consumer unit must be on some feed that only goes live at night?
Charge points are not specific to a particular car, you can have one installed from anyone.Kia seem to work with two charger installers - PodPoint and BP.
Thanks, that's brilliant! Presumably the incoming supply is the heavy black wire at the bottom, left, and then it goes through that big black box with "PME Earth" written on it - which I guess is some kind of master fuse? Then it goes into the small, oblong black box above that (not sure what that is?) and then the oblong white one, before going through the meter, after which, your marked-up drawing takes over?Does this help at all with explaining how E7 works. This is a fairly standard installation but there are variations
Blue is neutral
Red is the live wire which is powered 24 hour a day and is expensive during the day, cheap at night. It ends up in your large CU
Orange is the cheap rate live wire controlled power and ends up in your small CU ie is only energised by a contact in the teleswitch
Pale blue is the signal from a contact in the teleswitch to change to the cheap rate part of the meter
The teleswitch includes a radio receiver for a time signal to do the changeover.
View attachment 273414
I must admit to being an electrical numpty, so I don't know what PME and PEN mean! However, there are pretty tough type approval rules for electrical isolation of electric cars. I don't think there's a big problem with electrocutions, though? You can read them here, if you're interested:View attachment 273415 This is the worrying bit. Because it is PME if the PEN is lost and car parked outside unless some thing is done to auto disconnect the earth some one touching the car can get a shock.
There are a number of ways the EV charging point can get around the problem, a small earth rod to detect loss of PEN, a large earth rod and turn supply into TT, and monitor the voltage and auto disconnect if not in the 207 to 253 volt range. There may be other ways, but it means some thing needs to be done if charged outside, could even be an earthed mat under where the car is parked.
One would assume if the company is paying for the car, they also pay for the fuel, but it seems the main reason for the EV is the tax breaks that come with it. So may be the company will not pay for the charge point. But they are reasonable for the health and safety of their employees, so not sure what is down to them to do?
I remember an electrician being sent home as it was claimed he was drunk, so next day there was an interview, and the question was raised if drunk then the manager could not have sent him home in his own car, so it was claimed he was send home as he felt unwell. Not sure if that would have satisfied HSE, but he did not get sack, as the company is responsible while the employee goes to and from work.
So not sure how they have to deal with EV's? I know some one I work with was given a courtesy car which was an EV, without any charging lead, one way to ensure limited miles put on the clock. But was it because of safety, and not knowing if his supply was safe for use outside?
It is an on going thing EV charging, I tend not to take my charger with me on my EV e-bike, I could I am sure go into Morrisons cafe and plug the battery in while eating my meal, but the battery easy removes from the bike, so taking the battery in doors, and the charger is class II.
I saw the results of an earth mat connected to a PME supply, and the melted 4 mm earth cable, so I don't know what the result will be with EV charging points, and how to make them safe.
Thanks. I've never actually tried turning that switch off, but yes, I think it probably would!It would seem that your 'Radio Teleswith' not only switches the meter between day and night registers at the appropriate times but also contains a 'switch' (relay/contactor) which switches the storage heaters on only during the cheap/night periods. I presume that the isolator (white thing below the teleswitch) contrails (i.e. allows you to switch off) the storage heaters?
Kind Regards, John
As Sunray pointed out (I had not looked closely enough) that switch/isolator actually turns off everything in your electrical installation, not just the storage heaters.Thanks. I've never actually tried turning that switch off, but yes, I think it probably would!
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