No video :(

Much ado about neutral trippery

Подписаться 34 тыс.

Просмотров 31 тыс.

50% 1

Forsooth! A tale of handsome knight and his gnome-hatted gollum riding forth in ye ’olde Ford Transit carriage through fiery autumnal sunshine in Shakespeare’s County toward a perilous RCD trip & rescue of fair maiden from within tall keep of yon castle and... actually, let’s just fix that RCD.
Interesting as it perhaps is to see a backfeed of an RCD via what is presumably diverted neutral current from neighbouring properties. It looks like Jack and Jill Jones up the road have a problem or three with their electrical installation sending current down their earthing/bonding instead of their neutral. Still, it shouldn’t be noticeable to their neighbours Devinder and Deepali Doe; at least, not until they happen to have a neutral to earth fault of their own downstream from an RCD… in which case, they’re fu*ked.
SparkyNinja posted a short showing a large diverted neutral current recently:
• When you isolate the C...
When it comes to currents flowing in and out, Kirchhoff starts having something to say about it all.
For a nod in the next vid, you can buy me and Nigel a festive eggnog here:
www.buymeacoffee.com/dseselec...
My stupid Amazon storefront:
www.amazon.co.uk/shop/davidsa...
£50 off YourTradeBase, the Tradify butt-kicker:
go.yourtradebase.com/refer/3M...
SumUp credit/debit card processing for fartbox operations like mine:
r.sumup.com/referrals/oBF5S
£10 off your first Huel order when you spend £40 or more:
huel.mention-me.com/m/ol/nm0s...
Get £40 credit for switching to Zen Internet:
zen.mention-me.com/m/ol/rt4lh...
For web hosting, get £10 off at Krystal with the code DSESELECTRIC at checkout!
krystal.uk/

Опубликовано:

7 авг 2024

Ссылка:

Скачать:

Готовим ссылку...

Добавить в:

Мой плейлист

Посмотреть позже

Комментарии : 223

@andrewcadby 2 года назад

Good video. Fault finding is the best part of the job for me, I love it. The current measured on the earth conductor may have been normal, and not necessarily the result of a fault on another property. If properties further down the line have a TNC-S earthing arrangement, parallel paths back to the transformer can exist via bonded shared pipework, and, in this case, the TN-S earth. Some current will inevitably make its way back home via this alternate path

@rossmurdoch7870 Год назад

Just watch out for a little steel tab inside some connectors which links to metal casing for earth in some products. Not this one of course, but just be aware that swapping from the Manufacturers order is not always desirable. Great use of the Tester and explanation of lots of various faults and their causes Guys.

@bigalz5563 2 года назад

The kids can watch this tonight instead of I’m a celeb - a proper show!

@gregf9160 2 года назад

A _stunning_ example of forensic fault-finding and diagnosis 😀 Thanks so much for doing this stuff 👍 I love your work.

@dsesuk 2 года назад

Cheers as always Greg!

@jj-hn2ll 2 года назад

Yep second that

@Richardincancale 2 года назад

First 8 minutes - absolutely nailed the principle of the fault (no spoiler!). Absolutely top notch understanding of what would have left many scratching their heads!

@dsesuk 2 года назад

We have to figure this stuff out quickly or we'll never get down the pub Richard.

@Richardincancale 2 года назад

@@dsesuk Seemed to work! Did you ever find a job to fill the afternoon or just stay put?!

@jj-hn2ll 2 года назад

Lol Top man Richard for your honesty , me too. I tend to self blame myself and continually self flagellate with the mantra I was taking too much time. It somewhat amazes me how the install can deteriorate without a physical movement to the cables but is a nice learning curve to future fault finding. I would be interested what David charged for that lol .

@Aengus42 2 года назад

@@jj-hn2ll You've got constant pressure from the clamp pushing on materials that expand & contract at different rates. So there is constant movement it's just very slow. Also, as you know, that a tiny nick in pvc insulation propagates when stressed. We've all done this to remove pvc insulation. Cut a little nick in the pvc & then bend the cable to cause the cut to propagate around. Under the constant pressure from the cable clamp the expansion & contraction due to heat has done exactly this.

@jj-hn2ll 2 года назад

@@Aengus42 👍

@tc6907 2 года назад

What I love is the fact that no one calls you out on removing the cover on the board while it’s still live and working on it! Which I totally agree with if you are a well trained and competent electrician who knows where they shouldn’t be sticking there fingers It just shows how well respected you are David, another great video

@dsesuk 2 года назад

I shouldn't be so complacent. Nige can film my fiery death one day and stick it on here. See how many likes it gets.

@tamberp 2 года назад

@@dsesuk That seems more of a Liveleak kinda thing, probably get a lot more hits there!

@damiandrozdek5688 Год назад

@@dsesuk 😂

@garethlloyd5644 Год назад

You two have da skills to pay da bills, another great job chaps

@pauledwards9493 2 года назад

Another fine episode of Dads Army Electrical, David.

@GeorgeCox 2 года назад

(football chant) there's only ooooonnne Daaaavid Saaaavery..... there's only ooooonnne Daaaavid Saaaavery..... (and Nige and Linda!) Great video, guys, and fancy FX with the diagram and all. Love your work. 👍

@dominicboyle8652 2 года назад

I love it ‘the manufacturer is a knob head’ 😂

@craigevans9617 2 года назад

I'll say it again, this is my favourite type of content. Just along for the ride with people using logic to solve a problem. Thanks for sharing 👍

@peterrobinson850 2 года назад

Hi, Dave and Nige, From old an spark from the 60's. Nice bit of fault finding, logical approach but can throw you when you have two faults simultaneously, got totally engrossed again that's real entertainment for an old fart like me. Good call checking the diverted neutral currents you don't want to get part of the return circuit even with the power off, it doesn't even have to be a fault with the neighbours just share return paths. you are 100 times a better spark then I ever was, enjoyed ever minute of these long videos, great stuff keep it up. Peter.

@dsesuk 2 года назад

Thanks for tuning in Peter!

@APSuk2 2 года назад

Sunday saved again!! Cracking video David, great to see some real world fault finding. Loving the diagrams explaining the fault path & how you went about finding where the issue was.

@bigwoodrz 2 года назад

Excellent demonstration of your high level of skills. As said by another, a Masterclass by Dave.

@AndyNichol 2 года назад

Best and most informative Sparky on the interwebs

@dsesuk 2 года назад

Oh, I dunno. There's that other guy. And that clever fellow. Not to mention the useful chap.

@davidkelly4841 2 года назад

@@dsesuk The Boffin ;-)

@acelectricalsecurity 2 года назад

Definitely, for all the dicking about, you can tell her knows his stuff, most of the others are interested in product placement, and will not say anything controversial for fear of upsetting the companies that lavish them with goods.

@stuartandrews4344 2 года назад

Definitely.

@chrisardern4594 2 года назад

Yet again Dave you deliver a interesting and informative post.

@GeorgeStyles 2 года назад

Another good episode... Thanks for the diagram showing why it was tripping, made the rest make sense to someone not trained as a sparkie like me. And loved Nigel's hand signals lol

@NivagSwerdna 2 года назад

@5:30 1.5A on that earth. Wow indeed. Nice trip around the down light fittings. Thanks for the video.

@darkdepth1991 2 года назад

Good video about damaged isolation, keep up the great work !

@richardburgess6040 2 года назад

Great video - great explanations, just the right amount of innuendo. That Metrel tester looks good too!

@raymurphy9749 2 года назад

More of these fault finding vids please Dave and Nigel always interesting to watch with a good outcome. Better than most movies these days 😂

@jefftaylor4206 2 года назад

Dave - Great video, loved the thoroughness

@alvina69 2 года назад

Excellent video, I do love me a good fault find video… Some others on here spend ages looking at things and never seem to find the fault and just go around the house tightening connections (not every fault is going to be a loose connection 🤦🤦🤦).

@taskhunters5245 Год назад

Pleasure to watch. You're something else👌

@frankmcalinden3699 2 года назад

Another great video !!! keep up the great work chaps!!

@timhoward7037 2 года назад

Great video, very refreshing to see someone methodically fault find. These days I carry the prewired Quikwire plug and sockets as they make re-terminating downlights an almost joyful pursuit and I'm sure about 80% of all downlights are recessed cack just waiting to reveal themselves inappropriately to the world. Plenty of ways to skin the proverbial cat but an option would have been putting the quikwire sockets on all the downlights (rather swiftly), IR testing the jolly lot, then put take the downlights to the pub and put the plugs on over a pint. Keep making the videos - love them!

@thedodger1387 2 года назад

good piece of work . Thoroughly enjoyed the video

@Baggiolyful 11 месяцев назад

Hearing you both grunt as you stand up 😂😂😂.

@BlRaidX 2 года назад

Tis nice to see a father an son team constantly staying as a team. hahahahahaha

@petertallowin6406 2 года назад

I have said it many times before. It is a pleasure to watch your process for fault finding and sticking one to manufacturers knobheadery....... Kudos to Nige for now being marginally less tubby than you. 🤣 Good effort dudes.

@stupidmike11 2 года назад

You really have filled the hole that heartbeat's axing left in our lives, on a Sunday evening 😃

@dsesuk 2 года назад

If only I could compete with Countryfile.

@jimginn7163 2 года назад

Nice job you two👍😁

@matthewbeddow3278 2 года назад

Great video chaps, making the world a safer place a little bit at a time.

@martin54123 2 года назад

Excellent video as always, clear fault finding process. I agree with you that it was better to reroute cables in the fitting to avoid them crossing over, I've done exactly the same myself. I also don't have a problem with the front of the board being off if you are a competant electricain and in control of the environment, sometimes you just can't avoid working on lives sytems, it's the nature of the job.

@tompickford2697 2 года назад

Love your videos big Dave !!

@dsesuk 2 года назад

Well shit Tom, I love you too.

@notoriousspf4813 2 года назад

Absolutely superb video.

@martinoneill7005 2 года назад

Great video as always 👍

@pjmurray2927 2 года назад

Love your videos Mr Salary and Mr Marsh

@kevinrichards6506 2 года назад

I inherited a house full (and I mean FULL) of Enlite downlighters. You are correct, the push fit connectors can be a bit fiddly BUT there's plenty of room between connector & clamp - so even though CPC connections are to one side, the electrician who installed them has kept all the wires well spaced !! I've had to change a couple and it's been straight forward 👍

@gimp079 2 года назад

Love this stuff...fault finding is my least favorite part of the job..watching these makes it at a bit more fun.

@JBE 2 года назад

At least the downlights weren't wired in 2.5mm T&E ! I was on a job recently where such an act had been carried out. Absolute nightmare but that's another story. Nasty fault well found by the dynamic duo yet again. Well done Nigel you deserve that coffee.

@dsesuk 2 года назад

Ah, well there's another video showing just such a thing James - it just needs to be sellotaped together! A different dynamic duo was involved on that installation I recall!

@stuartandrews4344 2 года назад

A masterclass in fault finding...

@mitchnuke 2 года назад

highly recommend Integral evofire spotlights if you need a class 2 fitting, they managed to keep them fire rating without the "can" on the back of the light so they are nice and shallow if need if depth is an issue. Some CEF and most Toolstation stock them 👍

@acespark1 2 года назад

Spot on as usual David

@electrician247 2 года назад

Nice video David. Enjoyed it. Diverted neutral current is something we all need to check for and even monitor while working at main intakes. Something I try to encourage in my small way. The sparky ninja video is from the team at SPEN who released an excellent video in combination with the IET. Sadly the presenter passed away shortly after it was released. Resulting in it currently been unavailable. Great work and as always top banter/fuckery.

@dsesuk 2 года назад

Thanks Mark. I must admit, it's not something I've traditionally given great thought to, but an Amp and a half on the ol' green/yellow gets your attention.

@electrician247 2 года назад

@@dsesuk Same David. I think that SPEN IET video dropped the day I was changing another CU next to a gas meter and water bond with the main earth flapping around. Gets you thinking that maybe we need to treat that more carefully lol.

@MS-Patriot2 2 года назад

What level of voltage is pushing that current ? Is it hazardous or just a PITA to the RCD?

@AdrianColes 2 года назад

A sunday evening treat indeed!

@andrewberridge4630 9 месяцев назад

Excellent, methodical troubleshooting. I do a binary chop in similar situations - split at the middle!

@jamesfollon 2 года назад

excellent video !!!

@williamlowther7051 2 года назад

Well done that man, an absolute nightmare of a fault, never came across that kind of fault before on TN-S the DNO needs to sort that out surely, top job

@steverobinson8170 2 года назад

Its quite common on older properties where you have one feed split between two or three properties possibly all wired up to different standards over the years especially if other properties don't have rcds , or you have a combination of wiring standards from the DNO where they have done a repair , I.E my neighbours tns my systems tncs because of an earth fault both run from the same feed cable in the street , my boards latest edition her house was rewired about 50 to 60 years ago

@AnnoyDroid Год назад

I'm 22 minutes in ( I have watched this before btw ) and I agree with Nigel and yourself Dave, That is wired incorrectly even as a layman the EARTH (cpc my arse) should be in the middle. I think \ know it should be there for one reason safety if either L or N is to work lose then it has a greater chance of tripping the protection and not starting a fire. N.B. I do love you videos and I hope you continue to make more ( and no NB does not refer to a lesser know sparkie on YT )

@allanmould2633 2 года назад

Another good video david

@johnhales9310 2 года назад

Winner of the fastest manual screwdriver action 💪🏻

@KH-bs2bz 2 года назад

“That’s our scumbag” 😂 great video lads

@dsesuk 2 года назад

@@voltare2amstereo Smart guy, but I'm taller.

@0liver0verson9 2 года назад

Ah, some excellent Sunday entertainment!

@dsesuk 2 года назад

Excrement Sunday entertainment perhaps!

@Arachnoid_of_the_underverse 2 года назад

All thats need is the burning fuse across the screen and the mission impossible music in the background, oh and the glamorous assistant ( maybe you can get Nigel to wear a tutu as part of his PPE).

@RichardArblaster 2 года назад

Great job 😎

@sstorholm 2 года назад

The down lights are probably designed for the European market as our cables are round so the conductor order isn’t that static. Also, our CPCs are jacketed, so the risk of insulation compromise is a lot lower when you need to squash through two layers of primary insulation.

@dsesuk 2 года назад

Oh, if only such common sense applied here Sebastian. Unfortunately, I don't think it ever will.

@computeraddic675 2 года назад

Wel,thats why we have now those small boxes,so you can make your connections between the cables IN the box and then just one cable to the downlights.Its a bit more work,but more reliable because only one cable on the clamp on the downlight.A little knot in the cable IN the box to be sure you cant pull it out off the box.

@havoctrousers 2 года назад

came to post the same thing! a 90p chocbox with wagos does the job nicely and it doesn't have to be MF since you can pull it out of the hole to inspect it.

@TheEmbeddedHobbyist 2 года назад

When I find what I'm looking for, I always have one more look. That way its never in the last place I looked. Works for me :-)

@dsesuk 2 года назад

Genius.

@stevejagger8602 2 года назад

High current on the main earth could be a diverted neutral current from a broken/high resistance neutral on a TNC-S connection on the same supply distribution, which is entering the property via metallic water or gas connection via the protective bond. Great piece of faultfinding and long term resolution of the manufacturer/installer cause of failure. Nigel’s comment that the manufacturer is a knobhead is spot on!

@FrontSideBus 2 года назад

An amp and a half leaking into the earth would cost a bit of money over the course of a year! I quite like those Ovia downlights that have those "click" connectors on them. You can wire them up without having to support a big downlight which is flapping about in the breeze and then just plug them all in at the end.

@thedodger1387 2 года назад

great job good video

@mbinstallations3484 2 года назад

KSR firebreak downlights are double insulated class 2, denmans keep stock of them if you need to get some class 2 again I had to get some for the same reason the other day.

@dsesuk 2 года назад

Thanks Max. I don't use Denmans much - will have to see if they keep these on the shelf at my local branch.

@djb774 2 года назад

Liking that meter!

@boggothedoggo3890 2 года назад

Had this the other day on a job , silly amps on the water Pipe ,told them I would come back when they had a fitted a insulating section as it was dangerous to even work on

@johncooper5293 2 года назад

Fine bit of fault finding. Both have an eggnog on me.

@olly7673 2 года назад

Another really good video Mr S. I think, judging by the first minute of filming though, you might be wiser giving Nige a length of rope and a tyre to occupy himself rather than the camera. I love to see the way people approach faults, it's very interesting as a viewer, especially when you refer to the tester, showing it in use. I refer to my previous statement! The E5 group showed a clip from Scottish power, I think, on the dangers of having a live earth on an isolated board and made me think should the first part of the isolation procedure be putting a clamp around the earth? I'm keen to see your use of the MI3152 more as I'm looking at it to back up my Megger 1741+ but it's a lot of dosh. Keep up the fault finding vids and your use of the meter please..... just record it yourself :) I don't care what Nigel says about you, I think you're alright.

@dsesuk 2 года назад

I need to really set that Metrel to task Olly. So far, it's only been used for some basic faultfinding where continuity and IR are involved!

@matthewmelbourne9139 2 года назад

Fantastic video, and demonstrates the methodical approach to fault finding. At what point should high currents on the main Earth be investigated further? Is it resolvable, as it could be a cumulative effect from multiple adjacent properties.

@peterc3228 2 года назад

Good engineering call on reconfiguring the wiring layout to suit t&e cable 👍

@MS-Patriot2 2 года назад

Premspec - sounds like some kind of delay cream for the over eager, when Nige tries to “pull it off” or to prolong the action during the marvellous segue way at 37 min 47 sec.

@sdgelectronics 2 года назад

On split load boards, MCBs per RCD doesn't really mean much though. You could divide an installation into one MCB per point if you wanted to or into just a couple of circuits for the whole house... They're not ideal, but it's rare people get nuisance tripping from regular appliances. Enlite Spryte downlights are fairly decent Class II downlights btw, seem to last well. Not fire rated however, but often not required anyway unless that ceiling forms a fire compartment. Is that Metrel battery always flat though?

@Ragnar8504 2 года назад

I really don't think these downlights were designed specifically for the UK market and most European countries use round cables, so the location of the CPC doesn't really matter. I'm not even sure if these were designed with building cable in mind, most downlights seem to be intended for 0.75 mm2 flex, preferably one of them.

@cbcdesign001 2 года назад

I certainly prefer flex between downlights. Twice as much insulation between CPC and the other two conductors and its just a more suitable type of cable for a fitting that may be moved around from time to time.

@helmanfrow 2 года назад

2:19 "This is a big old board, innit". I'm always a bit bemused by residential "consumer units" on your side of the pond. They always seem to be about a third of the size and capacity of residential panels in North America. It's also a bit strange that you have to install your own bus bars and that plug-on neutral is only just catching on by you. Also I like your UK Sparky lingo. Y'all talk funny.

@dsesuk 2 года назад

We're rather behind the times on this side of the pond. Also, our houses tend to be shoeboxes in comparison to those stateside, and we use higher power circuits for socket outlets meaning there tend to be fewer of them traditionally.

@helmanfrow 2 года назад

@@dsesuk On the flipside, UK sparkies (at least those on RU-vid) all tend to carry insulation testers which I think are great but which seem to be less popular among North American electricians. We certainly have our fair share of wire faults.

@dsesuk 2 года назад

@@helmanfrow IR testers are par for the course here; anyone working in the job would carry one, usually as part of a multifunction tester. They're invaluable for tracking down GFCI trip faults!

@CallumWK 2 года назад

New logo looks nice

@dsesuk 2 года назад

Thanks Callum. I like the 'up yours' boldness the new capital letters suggest.

@CallumWK 2 года назад

@@dsesuk See if you can hide a 1 finger salute in there somewhere

@mastergx1 2 года назад

I know your not a fan of the LAP brand but I've been using the LAP AIO downlights for about 4-5 years now and haven't had a single failure (thats many hundreds of units - they seem to be far more reliable than their retrofit counterparts). They are Class 2 and very compact, easy to install units. I actually use 2-core flex on the first fix as its dead easy to terminate in these fittings. Give them a try!

@brizy231977 Год назад

That has to be Deta downlights, their smoke alarms etc are the same, the neutral and the interlink terminal are the wrong way round for 3 core cable.

@YouzY666 2 года назад

Probably the heat from the radiant accelerated the insulation failing under the mechanical pressure

@djb774 2 года назад

Safe to say those other down lights on the same circuit will be a similar standard!

@wilbertbirdner1303 2 года назад

A service call for another day.

@tomgriffin286 2 года назад

I enjoy your fault finding videos. I thought it was the convention to run the CPC/earth in the centre on the connection block. It must have been a builders job.

@johnburns4017 2 года назад

It was labelled by the maker that way.

@RichardArblaster 2 года назад

18:31 Oooh matron 😆😆😆

@stuartthespark 2 года назад

Have you done a tool belt pouch talk yet, what torch do you use?

@fairplaytoyou2041 2 года назад

how is the metrel doing and would you buy it ! or is the extras not worth the kings ransom

@peterrobinson850 2 года назад

Hi Dave, it’s me again old spark from the 60’s. I’ve been doing some mental exercises with the faults you encountered with RCD tripping, I would love your opinion on these scenarios I’ve been pondering over for a few days now: (1) why was there two simultaneous faults ie 1.05 ohm leak between E-N and IR failure, one of these faults should have shown up first, (2) you demonstrated that the diverted earth currents caused the RCD to trip with no power on, so my conclusion is there may have been some form of surge breaking down the compromised crushed insulation at the light fitting causing the two fault to appear at the same time if so it could mean so form of failure in the supply that may give rise a more dangerous situation in the near future, it seems strange two fault at the same time and both would on there own cause the RCD to trip, I may have finally flipped and ready for to be consigned to the loony bin. Peter.

@jeremykemp3782 2 года назад

Please dress up as Black Adder and Baldrick , the laws of the universe will do the rest

@tsheritageengineering 2 года назад

Had a nuisance tripping on a lighting circuit happening first thing in a morning, reset and all ok for the rest of the day. Of course it was the last fitting in the circuit! Turned out to be a choke in a fluorescent fitting breaking down.

@adcuz 2 года назад

Are these fittings deemed as OK, with the single insulated wires coming from the connector box to the body of the light?

@dsesuk 2 года назад

I called the manufacturer out on that back in 2017 when I first came across the brand and they told me they were in fact double insulated. The outer jacket is presumably just colour coded making it look single insulated.

@rogerbean393 2 года назад

I think Metrel should let you keep that 3152 , your a good brand ambassador.

@acelectricalsecurity 2 года назад

There's nothing more annoying than finding twisted conductors in a single piece of green/yellow sleeving, but if you like to twist the conductors together, sleeve them separately and just twist the ends together, that's what I do, and it's easy for the person following to split them, if necessary.

@johnburns4017 2 года назад

This rogue current coming in via the earth from an adjacent property will run right though the earthing system in the house. If there is a metal framed appliance that is earthed, this may cause problems when touching it.

@havoctrousers 2 года назад

Depends on the voltage. If it's over 50VAC then I'd worry.

@andrewberridge4630 9 месяцев назад

I'm surprised at just how many buttons you need to push on the Metrel to do the IR test. Much prefer my old Megger where you set the mode, then it's just one press!

@arniewheeler4673 2 года назад

agree 12:15, adjusted myself for that very reason

@AndyK.1 2 года назад

We are running out of space on the memory card 🤣. Get on with it nige

@richard-riku 2 года назад

20:54 this problem with the order of the conductors is something the UK is stuck with thanks to the funny flat cables you use .. and the CPC does not even have its own insulation!! in Europe our cables are round and all three conductors insulated. Should the light manufacturer order their connections specifically for the UK market?

@pault4793 2 года назад

Hi David , just wanted your opinion on the metrel 3152 , as just having my kit nicked i was thinking about this , i had the 1741 meggar , appreciate your thoughts thanks

@dsesuk 2 года назад

Pricey but well featured is as much as I can say at this point Paul. Although we've had it a few weeks, this and the last fault finding video are all we've used it on, and that's not exactly putting it through its paces! I need to find time to sit down with it and go through the full feature spec. One concern I've heard from others is on battery life, but I can't answer to that as of yet.

@pault4793 2 года назад

@@dsesuk thanks

@garythomasson4023 2 года назад

Click flow connectors i love, plenty of room

@markhardacre1 2 года назад

Bundy wired that kitchen I’m sure 🤷🏼

@billyt9921 2 года назад

Fuckin love u guys

@steverpcb 2 года назад

If the LNE markings are proud they can be scraped / sliced off with a stanley, if recessed they can be scraped untill iledgible.

@dsesuk 2 года назад

I could also re-label them using my Brother label printer, but if someone in the future is intending to make any alterations to those things, you'd hope they'd go by the wiring colour over anything else. If they get too confused, you'd have to question what they're doing dicking with the electrics anyway!

@steverpcb 2 года назад

@@dsesuk You raised to posssible issues yourself, I prefer to use an idiot proof system even though there are no system proof idiots :( Worst case that I can think off is a comercial building 30 years ago, TNC, SWA running across a football pitch ( route unknown probably the long way around ), everything in the building connected back to the Switch Fuse where all CPC's were connected to each other but not to the body of the Switch Fuse that the SWA supply used via gland, everything was spiders legs in mid air ROTF This is the same building that I have mentioned before with the 10mm TWE traced back accross the loft to 4mm twisted with a flag of tape on the twisted in air conductors !

@haldo691 2 года назад

No matter how idiot proof you make something there's always a bigger idiot to prove you wrong

@busman2000 2 года назад

Would that same fault have presented it'self in an M.E.N earthing arrangement? As that's what we have here in N.Z.

@wilbertbirdner1303 2 года назад

The N-E resistive short? Yes. But the RCD wouldn't likely trip with the circuit off like it did in this case, as the current path would be through the lights to the neutral to earth.

@davidb3537 2 года назад

Hi, Not keen on what I presume was only basic insulation being exposed on the downlight manufacturers cables , why bother to ensure the cable sheath is in the cord grip if the manufacturer doesn't double insulate their cable??