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
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 😂😂
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!
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.
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. 😄👍
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 🤣
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!!!!
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.
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.
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.
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 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.
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.
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?
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 🤣👍🏼
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!)
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
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!
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.
@@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.
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
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
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 ?
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
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.
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
'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.......
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,!!!!!
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.)
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.
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 😊
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
Great question. In a usual situation it would be fine, and it’s rumoured the next regs update will encourage this ‘supplemented tnc-s’. But in an ‘off grid’ scenario, you must separate from the supply neutral and earth entirely.
A TT earth connected to an existing TNCS system is in effect just another earth point on the PME (TNCS being a PME arrangement). I think the reg's should encourage this - there are numerous advantages to having a local PME point (i.e. a TT earth) at a property - primarily it gives you another layer of protection if there is an earth fault on the DNO line....which can be a disaster with TNCS in scenario's where there is no other form of effective earthing via the utility bonding (plastic incoming water pipe, no mains gas at the property) Imagine a scenario where the incoming DNO earth is somehow broken, yet the live is still connected - with TNCS combined neutral earth, this will in effect make any externally conductive earthed appliances and your sinks, taps etc to be at mains potential! where there is no effective local earth to ground the floating potentials.
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).
Great video Cory... I'm all Earthed Out now🤯 One thing though about Gas/Water bonding... you forgot about MDPE incomers 🤫 Oh, and by the way, that kewtech is anything but basic... recently helped my nephew get one which like you he loves and at a 'bag of sand plus the dreded' ain't cheap given his lack of income at the moment. Anyway great video and keep doing what your doing. Respect 👊
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?
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
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?
‘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!
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.
Really informative video! I'm no electrician but the way you've demoed this is 10/10
Glad you liked it!
You are a fantastic presenter. Great clear electrical information and very engaging. Thank you
Wow, thank you!
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!
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 🤣
It’s good seeing the different ways things are done in different countries
Thanks! I like that too
Timmy should be internally grateful
Absolutely brilliant explanation! Videos are getting better and better. Please keep this kind of content coming.
More to come!
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
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.
8:42 oh no timmy 😢 😂😂great video mate.
brilliant video Cory. Cheers from NL
Always great to watch a Corey video drop...been a while since your last upload...Great work mate🙂
Thanks Dude 👍 , more to come
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.
Great video and explanation on why we do what we do .Thanks Cory
Thanks for watching!
@@corymac always 👌
Your uploads make my day, thanks for your work 👏🏼
Happy to hear that!! It’s absolutely my pleasure
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.
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!
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!
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!
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! 😂
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.
As someone who is about to start electrical in college your videos are so helpful
Glad to hear it!!
Excellent content and explanation. More please.
More to come!
I think "To Live and Die in LA" was your best song. But "Dance Hall Days" was great, too.
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.
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.
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
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
8:42 😂😂
Brilliant video!! Cory love your content!!
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!!!
Another great video Corey! Fun to watch and learning at the same time 👍
Glad to hear it!
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
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.
Love this channel, learning and having a bit of fun, I like Timmy he needs to stick around 😀😀
Glad you enjoyed it!
Nice one as always Cory love watching your content 👏😎🇮🇪
Awesome thank you!
Thank you for the explanation very interesting
You’re welcome Dave!
Love this guy 🙂🇮🇪🍀
We love you too!
I learn more from these videos than my useless lecturers ever taught
Amazing content,do keep it up Cory.
Appreciate 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
Absolutely excellent video!
Thank you very much!
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 cracking video Cory. Educational and interesting. I bet Jordan misses you at Artisan. 😂
Hope so! 😉
Excellent video my friend! Great training techers 😉👊🏼
😉 Thanks mate!
Great video. Thanks for fully breaking it down .
Lunch break videos are sorted for a while, thanks keep up the good work 👍
I hope it’s a decent lunch 🥙
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
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 ?
Well done Cory nice episode , please give more details of work, because someone follow u mate
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
watchin in progress ... loving the whiteboard explanation. i'm a layman and it helped me a bunch. thanks :)
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 😁🤓😉
Fantastic work and a great explanation. Keep it up.
Love your vlogs they are always something different and educational, Thank you.
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 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 😁👍
'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.......
🦅 ⚡️ 🫡
great video, timmy lives another day
Excellent Cory
Great content as always keep it up !
Amazing learning from you yeah
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,!!!!!
@4:02 Pauline in „The League Of Gentlemen“ has pens, too... 🤣🤣
Fantastic Cory! Theory and practice. And cool real world "stuff". I look forward to the next episode. Cheers
Really interesting video Cory. As others have said, you would make a great trainer.
The saving for a rainy day joke got me 😂😂😂😂 ☔️
Glad someone got it!
Love it! ❤
Thank you! 😊
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
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.)
Interesting topic! Have a question if you don't mind, are you changing from tncs to tt system?
In this video I am indeed!
Hi from down under, its interesting watching how the UK system are completed
I’ll have to come down and see how you do things 😁🏄🏻♂️
@@corymac sounds good
Cory, if you ever want to change career and become a trainer, you’d smash it. A proper natural at explaining things well.
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 👍🏼👍🏼
Brilliant…lovely and clear
Thanks Martin!
Great video again Cory 👍👍👍
Brilliant video Cory
Thanks!
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.
Great video Cory.
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 😊
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?
What would happen if you added the TT but kept the TNCS system connected as well?
Great question. In a usual situation it would be fine, and it’s rumoured the next regs update will encourage this ‘supplemented tnc-s’. But in an ‘off grid’ scenario, you must separate from the supply neutral and earth entirely.
Look at our MEN system in Australia. We have our Neutral from the Transformer tied to Earth & We also have an Earth Rod.
A TT earth connected to an existing TNCS system is in effect just another earth point on the PME (TNCS being a PME arrangement).
I think the reg's should encourage this - there are numerous advantages to having a local PME point (i.e. a TT earth) at a property - primarily it gives you another layer of protection if there is an earth fault on the DNO line....which can be a disaster with TNCS in scenario's where there is no other form of effective earthing via the utility bonding (plastic incoming water pipe, no mains gas at the property)
Imagine a scenario where the incoming DNO earth is somehow broken, yet the live is still connected - with TNCS combined neutral earth, this will in effect make any externally conductive earthed appliances and your sinks, taps etc to be at mains potential! where there is no effective local earth to ground the floating potentials.
thank you
Great video, thank you
Glad you liked it!
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).
3:12 YES, ☕-boy! 👏😂
Great vid Cory. 👍
Thanks! 😄
Great video Cory... I'm all Earthed Out now🤯
One thing though about Gas/Water bonding... you forgot about MDPE incomers 🤫
Oh, and by the way, that kewtech is anything but basic... recently helped my nephew get one which like you he loves and at a 'bag of sand plus the dreded' ain't cheap given his lack of income at the moment.
Anyway great video and keep doing what your doing. Respect 👊
Great point!
The incomers here didn’t apply, they were all plastic
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?
@16:17 - What's a Vacum?
It's a partial vacuum: it's missing something...
You are a legend mate! You describe things very well - have you ever thought about becoming a teacher?
I prefer teaching via my videos 😁👍🏼
You're a legend.
👊🏽👊🏽
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
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 stuff 👍🏻
Thank you Mike 👍🙂
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?