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This teaching is a topnotch, you made it so simple, I couldn't drop my phone till the end. truly you are a great Teacher, thanks to @Robert of Access Academy, another electrical guru who recommended your channel to us, his student.

Fit a earth rod

Every time you said “simply” or “obviously” I drank, and then ended up in the hospital. 🤙🏻

Wow, this supply design is a total rubbish! Unbelievable. Thanks for the great video

The screw type "Pozidriv" should be pronounced as "POZ-ee-driv." This pronunciation comes from the name itself, which is a portmanteau of "positive" and "drive." The emphasis is typically on the first syllable, making it sound like "POZ-ee-driv." So, in other words, John’s correct.

Thank you so much! Very well detailed. You should have your RUclips channel linked with your Amazon sales so that we may buy the same equipment equipment you're using.

very useful video.. .thank you Sir!

Golden 👍

Would modulating the potential DC current reduce the arc?

Can homeowners purchase/own everything in the meter box?

This is why solar panel shorts are so dangerous

Excellent video's. This channel is the best. No nonsense and just explains everything so clearly. I am after learning so much already

Thanks Dude. Love your vids.

It was either Friday afternoon or the apprentice, while the spark was drinking tea 😂

when he said hello I'm JW.. you most certainly are John Wick with this... You my friend deserves a seat at the High Table. 👏👏👏👏

when i was working as spark, which i did for forty years,after serving a five year apprentiship. if i ever came across a neon tester screw driver, i would smash it up ,before throwing it in the bin. they are dangerous ,and only fools would trust them.

Phillips screws aren't all that uncommon in the UK - they're not generally seen in woodwork or construction, but if you're working on electrical appliances, power tools, cars, or machinery in general, there are plenty of PH screws to be found. And JIS, of course, but that's a whole different kettle of screws.

God it's wierd watching someone use the old wrenches now knipex are everywhere 😎

Having an issue with our central heating system. I have a brand new thermostat, and dual zone heating. The heat pumps both work as I can wire them each to the upstairs thermostat which works but I cannot get the downstairs thermostat to call for heat even though it ‘clicks’ when turned up. Any ideas what this could be?

Can a unit, similar to this, be used to retrofit an SPD outside of an existing CCU. For example a unit with an SPD and Main Switch that takes in the meter tails, then can supply the existing main CCU? Great video !

Would strongly recommend you readers turn your attention to Robertson (square drive) or Torx instead. Both infinitely better than Pozi or Phillips. The only legit use for Phillips is in machine driven gibboard/drywall - the driver simply cams out once the screw is far enough but not breaking through the surface. For use on wood, the other formats are far better. Torx can also be used with a hex driver (Allen-key) although that's a hack that can backfire if the screw head is not hardened.

Have you ever beeen on a paternoster lift ? There used to be one at Newcastle University, but that was in the 80s .. it has long gone now. It was great fun to use .. no lift doors at all and the actual lifts never stopped moving.

"... not just pipe but all the taps etc. become live ..." That is frightening.

Be careful when using this as logic for designing for maximum conductor size as theoretical voltage drop mitigation & associated savings are really difficult to recoup particularly when in a domestic environment even for the sustained-power output of EV chargers. The engineer in me wants to install the fattest cable for our next EV charger at a holiday home but running the calculations on real world use - it just doesn’t hold water if your sole aim is to invest in 10 or 16mm cable just to save money. Yes EV chargers spec sheets do design for 16mm conductor sizing! Fair enough if you have a long run and need to hit minimum voltage drop parameters but you wont be saving money anytime in the next decade (or maybe 2) for doing so, its purely for performance in that scenario. For reference my long established (>3 year) average energy consumption in hatchback EV is 18.1kWh/100km in an suburban setting with occasional motorway driving ~130km/h and Irish weather (temperate climate, mostly mild & always wet 😂) much like yours in the UK. Price of energy is 0.31€/kWh (which is essentially a market low here), best T&E prices I can find are 16mm cable at 9.4€/m, 10mm at 6€/m and 6mm at 4€/m. For reference I drive ~18k/km a year meaning I charger for less than 500 hours a year. The example here is 1250hours. If you run an office fleet of cars perpetually charging on 7kW AC then you may actually reach a ROI. Although in that case perhaps you’d be using 3 phase 11-22kW AC so much of this domestic scenario won’t apply. Best I can tell - 6mm is probably the sweetspot between overkill and minimised energy wastage in the context of the cost of copper for most homes. To be fair I think that was the logical conclusion from this video. Perhaps you can find better cable pricing but to be honest you’d also probably be paying for higher spec EV-Ultra style cable (SWA with Cat5 ethernet) and that’s what most Electricians will go with. Really enjoyed this video, always learn a tonne from your content. Open to discussion & challenge on this. 👍

Brilliant video

Very surprising, never knew this before.

I have a screw like your black one for some brackets. What size screwdriver do I need to fit it?

This isn't the inside of a standard breaker. I don't need the likes of you to explain how circuit breakers work, dimwit. You take apart one freak model?

great video cheers, x 1.5 speed though :D

Superstar- thanks so much for providing us with this video- really helps

After proving dead when testing continuity of main earth is that the ZE value (loop impedance test) or am I getting confused cause how else is the main earth checked?

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Excellent information

Another brilliant eye opening video explaining a pretty complicated and possibly lethal situation, which will in fact be common throughout the UK. I would suggest most electricians will not know too much about. This video should be shown to anybody who works on domestic electrics, and crucially Gas and Water pipes. There must be several fatalities stemming from this diverted current situation. The most worrying thing its dangerous almost by design. TNCS is a pretty poor arrangement really considering the parallel paths through connected and bonded pipework in the streets. Should we reconsider the our Bonding practices or install plastic pipework as it enters the property as standard?

If you have a transformer with inputs of L & N @240 V with N being bonded to Earth .... and you connect these lines to a transformer which has L1, L2 and a center tap neutral Such that you can now have 120/240 volt split phase on the secondary side ..... Should that secondary side neutral be connected to earth?

On variable RCD setting you can get to the higher RCD numbers quicker by going down the scale. After 10mA it goes to 1000mA,990mA,etc. Also the voltage plug will give you L-E v if you press test. Press test again you’ll get N-E v, press again L-Nv.

What’s the name of these fuses so I can google and purchase a 30a one? Thanks

That's incredibly helpful, thank you

Hi, thanks for the great vid's! Can I ask you if It's ok to use a thicker twin & earth cable for my lights in my house, as I have some cable left over. Thank you

Hi John, thanks for this video. Why there is an earth connector on the outside of the housing of the small inverter (the inverter at the very beginning of your video)? Because if I would connect it to earth, there is still no connection to one of the two live wires to define one of both as neutral with earth potential, right? So anyway there cannot be a flow back to the power source through this housing connector? I don´t get it. Maybe you can help?

Never understood why anyone would want to deliberately short themselves, c/o any electrically conductive device????

The three pin plug is Prakash from India , I have led light no rectifier , but works in 220 ac without any problem , I attached with plastic Cable tie to the aluminum pipe but noticed when I move my finger along with pipe noticing some vibration like mobile phone no electrical connection to the pipe .

They may be plug in but surely if they are made to type B MCB specification, they provide finer circuit protection than a rewire fuse for both overload and short circuit?

Thanks for this video, simple and clear explanation 👍👍👍🌹🌹🌹

Thanks. My boiler and pump were running continuously. Watched this and opened mine. The microswitch was half way pushed in all the time and had some black gunk on it. Pressed it in and out a few times with a screwdriver wiped the gunk off with a cotton swab and all good now its working as intended.

RIP Wilko, the substandard shop

Dose the same principle apply if your second zone is underfloor heating?

JW, great video as always and very detailed. One quick question if you do not mind. I am replacing a Neff 3.6kw oven that is wired into a 32amp mains supply with an isolation switch (to the left of the Oven) and connected to a 40amp circuit breaker (MCB Dom40B6 B40). The new Oven is a Bosch 2.9kw and comes with a wire and no plug. As the new oven is a lower Kw does the new oven need to be plugged in to a 13 amp socket or can it be wired directly into the existing 32 amp mains connection (which is my preference as it makes the installation easier as no available plug). The House is 14 years old. Cheers

Thank you for sharing - frankly you are the go to authority on everything electrical. I don't think you have covered emergency power from solar inverters yet so I am going slightly off topic but I need to get an earth for my Solar Inverter's EPS supply. I had a lightbulb moment and thought why not use the galvanised screw piles that my shed is sitting on, as Earth? The shed is at the end of everyone's garden so probably 20 metres from any house. I measured the voltage between Live & Mains Earth and between Live and a screw pile and got exactly the same 244 volts. The screw piles(x4) are at least a metre deep with 6" diameter screw at the bottom end. The supply from the batteries is limited to 3kW. Would this work and meet regs?

of course they have a different connector then the US, it's all thin and wide