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I want to provide H&C water to a small sink in a garden toilet. I have identified the Redring MS6 undersink unvented water heater and want to double-check my interpretation of manufacturer's instructions (MI) as to whether an expansion tank and associated fittings is mandated or can be omitted...

My EV (a Tesla) was supplied with a UMC cable ([Universal?] Mobile Connector) with adapters for 13A domestic power and 32A "commando" socket (which is what I have installed)...

Okay. So, taking your and JohnW2's comments together, I understand that your (mutually agreed) view is that the EV charging point installation in my case should be TT with an earth rod close to the charging point installation and that will be mandatory from 1 January. Do you go so far as to...

Won’t that mean that it will be very difficult or impossible to make a satisfactory installion of an EV charger in a PME system?

So what will change on 1 Jan? According to the specialist sparkie I spoke to, a rod will have to be installed at or close to the charger, regardless of the earth system. But (he says) it will still be connected to the MET. What resistance standard will be applied? <100 ohms? If so, then for...

What about "The ... regulation need not be applied if none of (i), (ii) or (iii) is reasonably practicable"? As I understand, it's not "reasonably practicable" to get very low resistance on a single rod, whether TT or part of PME. The second (specialist EV) electrician was quite positive in...

Thanks for all that. This is a really interesting discussion. That section you quoted is the one that my electrician applied and discussed with me. The installation certificate for my job gives measured resistance of the rod as 74.1 ohms (I can't see anthing else on the installation...

Does seem that way, doesn't it. I don't get that I could charge the EV from an ordinary ring main circuit, which may or may not be RCD protected, through an external socket or an extension lead run from somewhere inside, without any questions; but if I install a separate circuit, even with RCD...

It is on the other side of the house, so a long way from the EV socket. I was hoping for a nuanced discussion so thanks for responding. Also, what is it about an external socket for charging an EV that calls for a separate TT earth whilst an external socket for [whatever other purpose] does not?

A 1m earth rod with a "Electical safety - do not remove" cap and 10mm2 earth cable to the MET (buried in conduit below a gravel path) The certificate is at home so have to check later. Do you mean the impedance value? Or something else as well?

My house has TN-C-S earth system. My electrician recently installed a new 32A power supply on external garage wall to charge an EV. He drew my attention to a section of the 17th Edition regs, that he interpreted to mean that an additional earth rod was needed for the installation because...

Well I hope I am 'for real'. I'm not a qualified sparky but I do have some knowledge. More importantly, I think, I recognise the limits of my knowledge. I didn't state that all LV supplies are 230V, so not sure why you're making a point of questioning my understanding of that. I had a...

I have many 12v halogen MR5.3 fittings all with separate transformers, mostly 20-50W. I started to replace the lamps with LEDs several years ago and found that some started to flicker immediately or after some time. The fix to that was to replace the transformer with one rated 0-50W. This...

I've just had a bathroom mirror unit installed in a new bathroom. It has SELV lights downlights for the mirror (set in the top shelf) and under the bottom shelf. On inspecting the wiring arrangement, set in a recess in the top of the unit, I noticed that the 230v supply to the transformer has...

Dishwasher as above (fully integrated) is causing RCD to trip ~5 mins into a wash cycle, which I suspect corresponds with water heater coming on. I have tried running on rinse cycle and no trip. Also got to element connection from below (by removing kitchen plinth and d/w inspection panels...

I'm trying but struggling to find someone who will come out quickly. Meantime no hot water. Is there any simple, DIY curable fault I can check/do that I haven't done already?

Need some help diagnosing problem with this installation in a two bed flat. Condensing/combi boiler with internal stored hot water. Have had no problems up till now although have been away over summer for 6 weeks. All indicators (lights, water pressure) on the boiler appear normal/okay...

My sons complain that wireless network signal for the PS3 in basement room (router is in the study on ground floor) keeps dropping off. They say it's my gateway/router, which admittedly is quite old. But I don't want to replace it until I'm sure it will improve matters. Alternative I'm...

This is a shower valve that I think has faulty cartridge (water doesn't run hot). Can someone say what type/make of valve this is; whether replacement catridge will be available; and explain how I can get into the valve to remove the cartridge. TIA.