Off Grid Earthing & Bonding Made Simple | ØY17
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- Опубліковано 23 сер 2024
- Join us today as we work on this awesome example of an off-grid system in Dorset. Today we explain the importance and theory of earthing systems, this is often skipped over in the design phase! This video took along time to make, I hope it helps! Do you think earthing is important?
The links from the video, along with some merch n some big ol’ discount codes 👇🏼
linktr.ee/oyel...
Try Tradify for free! No card details needed. ( use my code Corymac50 ). You wont regret it!
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#electrician #milwaukee #electricalapprentice #earthing #engineering #learnengineering #learnelectrics
‘I’m feeling so American, I should probably check my cholesterol’ 😂😂😂😂
Lol haha
As an apprentice I appreciate videos like this, not only do you show the theory to it but then you show us a real world situation which is something I don't get in the classroom
Glad it helped mate!
You're a born trainer Cory, seriously. If you ever give up being on the job, take up a position to train others at a Tech or equivalent in the UK. Loved this! Oh, and Timmy _(Timmaaaa!)_ is eternally grateful 😂😂
“Timaaaaa” 😂😂😂
You’re too kind
This video is full of little gems. The labelling at 16:15. "interwebs" and "vacum", love it.
brilliant, im currently on my level 2 training to be a spark and this helps me so much its one thing learning these things but its another to see it being done in real situations. your passion for the job really shines through aswell, i hope one day i will be as knowledgeable as you!
Glad to help!
You say you're not a teacher Cory but you certainly have a talent for it. I'm not an electrician but find your videos fascinating.
Unlike my old dad who, I swear, was immune to electricity the amount of times I saw him go: "oops, that one's live!" and walk away unscathed, I would not DIY but it's really handy to gain enough understanding to recognize a good electrician from a not so good.
So thanks for the lessons, I am enlightened. 😄👍
Thanks Jude!
Timmy should be internally grateful
Really informative video! I'm no electrician but the way you've demoed this is 10/10
Glad you liked it!
Great video!❤
We install alot of off grid systems Adding a genny gets intreasting.most victron inverters ypu can select eartth netrual relay as the bonding point.
Confusingly cory... the battery regs say to keep the pme earth in island mode!😅
Lesson number 4: if an inverter/charger is powered by both a battery bank AND the grid (or a generator), this whole ground safety connection scenario is a lot more complicated, and is highly dependent of the specs of the components.
Such as:
• does the inverter have a neutral/ground connection inside?
• does the generator have a neutral/ground connection inside?
• are you installing the right ground connections without creating ground loops?
But all of this would not change what happens for the ground connections for the AC output side of the system
From watching your first video on artisan, following your music and watching oy channel. You’re are the master of all and learnt so much from you being an apprentice.
An electrician that actually draws semi-decent circuit diagrams and actually sounds confident when writing equations up on the board; I am impressed. I truly am.
And this right here is how you do a video for the Trades. Brings back both the pride and respect so often forgotten ✊👊
Very well executed, and much appreciated. And I'm confident in your success, no Doubt!!!!
💯 thanks mate
It’s good seeing the different ways things are done in different countries
Thanks! I like that too
great video. whilst you were talking through the testing, i couldn't help but notice the labelling on the sockets - vacum and interwebs were my personal favourite 🤣
In Oregon US, two earth rods are required now. I got away without doing that when replacing the mains (consumer panel?) since I re-terminated the original wire. I am not licensed, but allowed to do the work as a homeowner if I do permits and inspections. Passed on replacing main panel.
I think "To Live and Die in LA" was your best song. But "Dance Hall Days" was great, too.
Absolutely brilliant explanation! Videos are getting better and better. Please keep this kind of content coming.
More to come!
Always great to watch a Corey video drop...been a while since your last upload...Great work mate🙂
Thanks Dude 👍 , more to come
Great video. Was wondering how “off grid” systems treat grid connections when there is a power outage. I’m in the thinking about it stage re and off grid/ ups style so will be interested in how you plan this out. If I decide to press the button then I’ll be giving you a shout.
Working for a DNO we install these earth rods regularly, unfortunately if you cut one of those rods you will find they are copper coated steel rods😅 but love the way you explain the theory behind the earthing and bonding. Brilliant video.
I love Kewtech, what do you think of it? Tell me 👇🏼
I should get 1 r they more helpful than the megger n if so I’ll get rid of my 1741+ ⚡️💤
I got one after seeing you using it happily, I have the model down from yours. But still, no regrets. Great kit
Your uploads make my day, thanks for your work 👏🏼
Happy to hear that!! It’s absolutely my pleasure
Great episode. As others point out, you’ve got a good teaching manner, not going to have students falling off the backs of their chairs because they’ve stopped following. Can you print a ‘vacuum’ sticker next time you are there? OCD etc.
Thanks Ian! 😂
you killed timmy! you b... loody did a good job of saving him! 😂😂
tbh, im not a sparkie but after this i now get the zs ze readings useage and the diff connection types (pme etc) bril cory! your a damn good teacher ! (and darn good sparkie too!)
Thanks Geoff!!!
Good man, i can thank you enough for your video(s). This was one of the clearest explanations on earth fault loop impedance. Thanks mate.
Glad it helped!
Gerat video Cory, just finished my domestic installer course, and struggling to get my head round several concepts, you've made things a lot easier with these videos.
And no-ones asked your peloton tag!
great video, timmy lives another day
The saving for a rainy day joke got me 😂😂😂😂 ☔️
Glad someone got it!
Love this channel, learning and having a bit of fun, I like Timmy he needs to stick around 😀😀
Glad you enjoyed it!
My inverter has an island mode function which requires me to install a new cable between my house and garage so im going to install an earth nest whin i dig the trench then convert the house to TT hopefully get below 20 ohm
Great video and explanation on why we do what we do .Thanks Cory
Thanks for watching!
@@corymac always 👌
You're very intresting and precise in how you convey yourself! Im a Refrigeration engineer and want to become a Electrician! Your videos are so entertaining :D
Great Video Cory love your approach to teaching stuff. But I do find the 'Generator room' a bit of a laughing nightmare i.e. the Victron is mounted on combustable chipboard, below which are a stack of Battery Packs, all sitting next to an oil tank! and you're worry about getting an electric shock. I would either have the owner move the solar system to the otherside of the room, or build a fire wall between the solar system and the oil tank.
There are alot of fail safes and changes still to be made. This is more of a proof of concept phase at the minute, there are ALOT more batteries, and at least 2 more
Inverters to come. Also, it’s in the remotest remote part of Dorset, and a good 70 metres from the house or nearest building, so at least if it goes pop, it’ll be a good distance from anything 🤣👍🏼
But fair points
Cory, if you ever want to change career and become a trainer, you’d smash it. A proper natural at explaining things well.
Hi Cory, many systems installed are in island/backup mode and as long as they are G99 compliant, do not require a separate earthing rod and can use the tncs earth. Here is the extract fyi :
In island mode, an installation with EESS must comply with Regulation 21 of the ESQCR, and the PCE operates as a switched alternative to the grid. All live conductors, that is line(s) and neutral, that are to be powered in island mode must be disconnected from the grid. The installation may remain connected to the distributor’s means of earthing (where this is provided).
Earthing arrangements for island mode operation
In connected mode, an installation with a TN earthing arrangement (TN-C-S or TN-S) may use the distributor’s means of earthing. In a TT system, the consumer’s earth electrode is used - but care needs to be taken to ensure that this provides an earth of sufficient quality.
However, when the installation moves to island mode, it is important to make special earthing provisions.
Regulation 551.4.3.2.1 of BS 7671 states that, in TN systems, generators operating as a switched alternative to the public supply cannot continue to rely on the distributor’s means of earthing.
hi Bill, im curious on this one too. My system ( not installed yet) can go island mode everyday during a set period of time ( say 10:00 am - 15:00) . How can i have a separate earthing for only this period? ( does this mean i should not connect my battery / inverter to the main MET? or can i have 2 earth connections simultaneously ?
Another great video. You and that whiteboard is like being back a college, just not as boring. How is Timmy? hope he recovered.
He’s a little shaken up, but doing well overall
Fortunately he only touched 49.999 volts.
Brilliant - I have a smaller Multiplus II here and was wondering about the earthing if I chose to not use it on grid/ess mode. Masterclass.
Another great video Corey! Fun to watch and learning at the same time 👍
Glad to hear it!
Excellent content and explanation. More please.
More to come!
A potential upgrade might be an earthing mat - a big ol copper plate that gets buried. Understandably not as convenient but worth leaving as a note for the homeowner if they have earthworks planned.
That rod is a good length!
Check out a Condudisc!
Given that the impedance is down to less than 5 Ω in this case, no upgrade is worth it.
The impedance is more than low enough to trip a breaker or RCD.
But as an earthing solution where the resistance is coming out too high, yes, it is a good approach.
A potential upgrade would be increasing the supply voltage from 230 to 400 😭🤩🤩🤩
@@deang5622 I was thinking in terms of how many years of use rather than the immediate state electrically when it's still quite new. Degradation over time.
Very interesting, this explenation helped a lot with validating every step I took in my solar installation, looking forward to the next video :0!
Glad it was helpful!
Nice one as always Cory love watching your content 👏😎🇮🇪
Awesome thank you!
In Belgium it's standard to have a TT-net, but the resistance should be less than 30 Ohms. (When taking the correct extra precautions, it can be between 30 and 100 Ohms.)
not much classroom stuff really hits home with me straight away but your teachings do . bigup thanks and i look forward to the next vid . on a side note , what van did you get ? any good?
So glad to hear it! I ended up keeping the caddy, budget with moving houses and areas ( you’ll see soon 😉 ) restricted me.
Cory Milwaukee Man Mac’s wipe board is out again shame you didn’t have a full set of colours. Maybe if you had the yellow one you could of been Timmy’s saving angel. 😂 Mockery is my only option because the Math went over my head 😊
8:42 😂😂
Brilliant video!! Cory love your content!!
Another cracking video Cory. Educational and interesting. I bet Jordan misses you at Artisan. 😂
Hope so! 😉
As someone who is about to start electrical in college your videos are so helpful
Glad to hear it!!
Lunch break videos are sorted for a while, thanks keep up the good work 👍
I hope it’s a decent lunch 🥙
Fantastic Cory! Theory and practice. And cool real world "stuff". I look forward to the next episode. Cheers
Poor Timmy.I thought he had fallen down the well!! Now you telling us he is touching the frames of ungrounded electrical equipment. Where is Lassie when you need her?. Great tutorial Cory!! I always like your cardboard classroom. Groundrods are common here in the states with only one common path to ground at each site location. It felt like we came to the duscussion without a prelim. of why you are doing the change. When you say mains .do you mean electrical utility supplyer?. Your vlogs always require a second viewing. Seperate and apart from the two moons over Myhammi what kind of Van did you get?. Happy Easter,!!!!!
To answer your question. In addition to extraneous conductive parts being bonded to the main earth then the other two are:
The requirements of ADS are met for the circuits
All circuits within or passing through the location are protected by 30mA RCD (or RCBO/AFDD these days).
Love your vlogs they are always something different and educational, Thank you.
Love this guy 🙂🇮🇪🍀
We love you too!
I learn more from these videos than my useless lecturers ever taught
Great video. Thanks for fully breaking it down .
Ah that’s the video I wanted, I’m just doing the same thing for mine. What size earth cable did you use? I ran 25mm dam that’s a cable and a half In conduit. I want to see if I can go six rods deep just waiting for the adapter for my drill and hopping it can go that deep lol
Amazing content,do keep it up Cory.
Appreciate it!
Excellent video my friend! Great training techers 😉👊🏼
😉 Thanks mate!
Well done Cory nice episode , please give more details of work, because someone follow u mate
watchin in progress ... loving the whiteboard explanation. i'm a layman and it helped me a bunch. thanks :)
'merican here .. I've got 3 ground/earth rods on my property from previous buildings, ... GOTTA have 'em here.... And, ... TBH... We NEVER "liked" little Timmy, .. BUT, .. Your calculations, way of explaining things/Edgumacating me, ... are TOP Notch, ... Well Done "Sir" , ... I salute you.......
🦅 ⚡️ 🫡
I see you haven't lost your angle drilling skills, Jordan must be proud. Another interesting learn with Cory. I've always thought sparks were the cleverest trades.
Absolutely, as a spark I agree entirely 😁🤓😉
These setups are so strange to me being in Canada, the supply connection here doesn't bring in a ground at all just hot and neutral, we always have to install ground rods or a grounding plate on every job , and then bond that to the supply neutral only at the first means of disconnect (main breaker, main disconnect) and we're done that's the only arrangement....
Having the earth connected to the neutral of the incoming feed, or having a separate earth wire coming in on the incoming feed is a better strategy for earthing than using an earth rod.
It is safer.
Using am earth rod is the worst way to provide earthing.
Firstly the earth rod gives much higher resistance/impedance than an earth wire, and secondly it is very much dependent on the moisture content of the soil, and that varies through out the year. So the Zs value is going to vary throughout the year through the seasons and hopefully it doesn't get too high.
Awesome bro! Learn a lot from your vids, soon starting my own small Electric business in Belgium :)
Go for it! You won’t regret it
You are a legend mate! You describe things very well - have you ever thought about becoming a teacher?
I prefer teaching via my videos 😁👍🏼
Fantastic work and a great explanation. Keep it up.
Absolutely excellent video!
Thank you very much!
Great video Corey! Followed you from the start at artisan. You really excel in explaining things and would be a great trainer in future! Keep it up.
Thanks a lot Danny 😁👍
@4:02 Pauline in „The League Of Gentlemen“ has pens, too... 🤣🤣
you save more lives than firefighters and doctors combined Cory.
I don’t need a cape. Some heroes are just comfortable wearing 32 waist trousers when they really ought to be wearing 34
Really interesting video Cory. As others have said, you would make a great trainer.
That's really interesting. Im looking at a hybrid system (without grid-tie) so imagine I'll need a local earth.
I've got a load of 6mm wire for the panels' earth but is that thick enough for the external earth?
Nice video. You should get a van lock on your car. Every electrician in Sweden uses them because of the break ins.
If it's the same I've used @ 14:12 it's actually a copperplated steel rod. Had to do a temporary earthing and didn't get the rod all the way in so had to cut it off and noticed
Love it! ❤
Thank you! 😊
PME has some serious downsides. Give it a reverse polarity and the earth becomes live, and then everything connected to earth in the property also becomes live lol. I knew someone who accidentally did it, and blew every metal socket in the property. BANG
Yes, it is pretty pants
That's not really a downside, that's just incompetence of the person who did it.
Great content as always keep it up !
Amazing learning from you yeah
thank you
On the other hand, with an off-grid system where the inverter is contained within the building, there is no potential between you and the generating equipment until you install the earth rod. So would an IT arrangement more practicable for off-grid generation?
Wow! 4.6R is an extraordinarily low earth rod value....must be close to the transformer....or maybe a PME electrode?
Very close to the transformer / expensive earth rods / multiple rods installed 😁
@@corymac Great result!
Hiya. In an off grid system you wouldn’t have the return path to the transformer earth. The Victron inverter has a relay that bonds earth and neutral together thus providing your return path. Effectively you are creating a TN-S system. The relay opens when you connect to the grid.
It is not quite that. You might have a path to the earth of the transformer but it is not a return path for the current, as the current did not originate from that transformer.
So whilst there may be a physical connection there, it doesn't provide a return path.
Great stuff. Does Timmy have a manager ? He's probably going to need a stunt double.
Awesome video, wish I had you as my teacher at college!
When doing your ze test for the rod you mentioned you’re looking for a value below 100ohms. I always thought the TT highest value was 200ohms? Has something changed I’m not sure about?
Top video 👌🤘 if you could do 1 educational video once a week that be massive help and great for the channel! And Ofc don't forget to give credit to timmy 👍🏼🤘😁
Excellent Cory
I’m planning todo a off grid system. Solar & battery system. Biggest problem I have is I live in Finland and it’s practically winter half the year.
How would I create enough power to be off grid fully?
Are there any kinetic energies around you? Wind, water streams, tide, sauna smoke? It would be a challenge, but with behavioural adaptation, and a lot of batteries, I think it would be possible. Maybe even via the route of electrolysis
Build a nuclear reactor in your basement?
Big thanks for a Epic video Cory., it really great to learn more from you , and adding theory method is brilliant , there no video like this for us apprentices sparky , Nice one ⚡️👊 ps which MILWAUKEE Drill do you use on the M12 , thanks ,
Top video Cory who said you can’t teach an old dog new tricks 😊
At what point are you bonding the new earth to the inverter neutral or is that done in the inverter
That’s done at the inverter 👍🏼👍🏼
Interesting topic! Have a question if you don't mind, are you changing from tncs to tt system?
In this video I am indeed!
Hiya mate, I'm sure you were on another channel before this. Its great what you are teaching so I can learn it all from you ;) I'm a plumbing and heating engineer and just installed solar thermal. The customer has solar pv but they asked me about batteries. What batteries should they choose?
I said there are a few UA-cam channels out there hut only a few like yours include the safety aspect and explain why we have to do it that way in England. So I want to share your channel with them. Do you have any recommendations please?
Thank you for the explanation very interesting
You’re welcome Dave!
Brilliant…lovely and clear
Thanks Martin!
You ae doing great as a teacher by keeping it simple. Many so-called teachers forget the KISS rule, which means Keep It Simple Stupid. You figure out who the stupid is - teacher or student. Probably because you're left-handed and use the "right" side of your brain.
Great video again Cory 👍👍👍
Should be a teacher, really engaging
Factual error:
You said the maximum allowable resistance of the earth rod is 1667 ohms.
No, 1667 is the maximum Zs value to cause tripping of a 30mA RCD.
I think that was a slip of the tongue as you demonstrated you know what Zs and Ze are.
Problamtic in my situation. I am mainly runnng offgrid but at times I need grid to charge and that activates the earth bond to the mains but grid disconnected there is no earth wire for AC out in the inverter and I can only ground the chassis to my own common earth bar which is connected to the copper vampire stake in the ground…. I hooked earth to an AC plug for now but if I go back to mains then that equipment has no Earth, hmmm.
Do you think there is a need for a 100mA Time delayed RCD before the CU as would be normal on a TT earthed system or is that protection not required here?