small note pythagoras only works for RIGHT triangles but this one is isoceles so if you split in the middle you get 2 equal right triangles and get the result
at 9:30 you use "Pythagorus". Pythagorus is only for use in right angle triangles, because this is a 120 degree triangle between phases, the best geometric principal is called the cosine rule.
@@corymac I did a mathematics degree before doing my apprentiship(in second year currently). My background sure makes learning in the class interesting.
Also the peak of the sine wave is not the 230V value. 230V is the rms (root mean square). The peak is around 325V from neutral point. Final point. Could be worth pointing out how dangerous it can be to disconnect the neutral conductor in circumstances where safe isolation has not been done. (obviously not the case here) 😀
I was about to confidently suggest you can cut it in two similar triangles (30, 60, 90) and use pythagorus then. But I don't think that leaves you any better off as you only know the hypothenuse (and some angles)
The last sketch was truly informative, haven’t really connected why I always use 1.73. You managed to teach me something that my old teachers didn’t get through to my below average brain.
Nice job explaining the three phase vs single phase which are of course all RMS values (230, 415). Taking a look at the peak values is also very interesting 👍
I think 'if in doubt ask' must be the standard CAD get out clause, I find it on every drawing I use. The 1.732 is derived from the Law of Sines for triangles rather than Pythagoras' theory. The sides of a triangle divided by the Sine of their opposite angles are all equal. VLine is opposite a 120 angle and VPhase is opposite a 30 angle. Setting VPhase to be 1V makes life easier, so you end up with 1V/Sin(30) = VLine/Sin(120). So 1V/0.5 = VLine/0.866, gives 2 = VLine/0.866. Re-arranging to find VLine gives, VLine = 0.866 x 2, which solving gives the 1.732 ratio. You also end up with the same value if you draw out the vector sum diagram and then measure the resultant line between VPhase1 + (-VPhase2).
A very good explanation of 3phase, except peak voltage of each line is approx 320, the average is 240 (0.707 times peak voltage); total between lines approx 590 x 0.707 is 415. Also having over stuffed trunking you getting more heat, so you need bigger cables; making it even more stuffed. Bigger is always better.
Yep and that server can quite easily be a raspberry pi running a Linux based OS which is brilliant for networking and talking to other servers and controllers.
Great video Cory. Touching on the note (if in doubt, ask). Absolutely! There's no such thing as a stupid question. If you don't know you ask someone who does. It's the only way we learn. "The day we think we know everything, is the day we stop learning anything." ~ TheCod3r, 2019
Hi Cory, I have just started my apprenticeship 7months ago doing domestic. How were you able to get knowledge/experience of stuff outside just regular domestic work(fuse board changes, new lights, rewires). Seeing you going abroad and working on these cool projects is really inspiring but I have no idea how these opportunities would even arise. Cheers!
That’s awesome man! I’ve just gained experience from constantly trying to put myself out of my comfort zone, and not being afraid to ask for more responsibilities. Get the basics down, and then follow your curiosity. You’ll smash it mate, it’s a fantastic and broad industry
How do you find the apprenticeship? One thing I would say to you is to try not get overwhelmed. The electrical industustry is forever changing and extremely challenging. Just take each day as it comes.
Nice explanation but it is worth pointing out that on the waveform showing the sine waves for each phase the maximum voltage isn't 230v as 230v is the nominal RMS (root mean square) figure - the actual voltage at the peaks will be up to 357v or thereabouts - it depends on the actual voltage delivered which in the UK can be as high as 253v RMS. This is why the insulation ratings on cables are based on the maximum peak voltage rather than the RMS and so seem larger.
You’re correct! I’ve pinned the comment, and will make a video on RMS soon. I just kept it simple for now to understand the premise of three phase, also, I was just coming out of a flu as you’ll probably hear in my voice 😂. Thanks for pointing it out!
@9:39 i would use the "law of cosines": c²=a²+b²-2·a·b·cos 120° where a=b=230 hence c=sq.root(2·230²·(1-cos 120°))=230·sq.root(2-2·cos 120°)=230·sq.root(2-2·(-0.5))=230·sq.root(3) since cos 120°=-0.5
Falling torch made me jump. Thought something went into the 3 phase board and shorted/tripped. Learnt something new too with the phase angle explanation. Great work as always, keep these coming.
As I hope people have already mentioned... The peak voltage of each phase is 340v, not 240v. 240v is the RMS value or "equivalent DC value"... i.e a DC voltage of 240v will deliver the same power across a resistive load as 240v AC.
@@Jay369 if you connect 240v DC and 240v AC RMS to the same resistive heating element, it will deliver the same temperature so back in the early days of the grid when they were battling over whether it should be AC or DC, I guess they needed a way of expressing an equivalence with the DC system.
230 volts times square root of 3 or 1.732=400volts, no one phase is reaching it's peak at the same time. Each phase is 120 electrical degrees apart. In the US, most common nominal systems are 277v/480v or 120v/208v. Canada also has 347v/600volt systems.
Corey this isn’t a dig at all and I’m sorry if this come around like it is, I was just pointing it out to you to make you aware, love all your content, keep the great work up
Just subscribed to your channel after coming across Artisan Electrics, you take pride and care in your work, it's so intricate what you do, very interesting.
500th comment wins a prize! 🏆 ( for subscribers only! ) Please note, the 230volts and 400volts values are ‘RMS’ ( or root mean squared values ). Also, it’s Cosine! I wasn’t expecting my post flu brain cardboard scratchings to actually make it into the video 😂. I’ll make these subjects a video asap! 😉
230 rms arent you actually getting 325 volts the fact that your meter is rms ? So would it be 400 v rms or is it actually 400v “true voltage “ if that makes any sense … thanks Cory!
Hi buddy sorry not been commenting last few vids but been on some strong medication and just wanted to say never stop doing this work it is you 1000% your top in all you do and take time out to explain all that you do, love to all. X
Sorry to hear that woody! I hope all is well, am I remembering right that I installed a charger for you many moons back with Artisan? Thanks for the support
@@corymac hi Cory unfortunately that was not me buddy, I’ve got cancer undergoing therapy for the next two years it ant going to win,,,,,, so when you get the big jobs that need containment and all well I am free just sitting here, you be safe and don’t stop never give in,, love to all. X
@@corymac thanks Cory that’s kind of you buddy I will never give in or stop as a single parent of three there no time for me,,,,,,, plus being off from work since 2019 I’ve got the cleanest power tools hand tools drill bits plumbing equipment door control /access cctv tools,,, my daughter has a skip in mind to free up space which I understand but with a heavy heart BUDDY I thought well with my fingers crossed more like it that there would be someone that would give this old boy a chance to shine once more or a few times would be nice. You be safe please and take care in all you do, and never stop. Love to all. Woody xxxxx } {
Good to see you bringing this up, but the 230 V of a single phase to earth/neutral is the RMS voltage. Nearly all multimeters give you the RMS value which is equivalent to the heating effect of 230 Vdc. Drawing 230 at the peak of the AC waveform is incorrect and could confuse the youngsters.
Crabtree make a SPD kit for these DB's and they definitely don't go where the MCB is. The last one I fitted comes with a Din rail bracket to mount inside the enclosure low down on the left hand side. They even have a knock-out on the cover ready for the SPD
Why split up the 3-phase and 1-phase breaker boxes? Here in Sweden most breaker boxes/distribution boxes have a 3-phase feed and then you just connect a busbar into the faultprotector with all the breakers. Then every third breaker have the same phase so the load is automatically better balanced.
Hi, Cory. Love the electrical content you've been posting. you'll find that the pythagorean theorem wont solve that type of triangle, the Cosine Rule is the appropriate method for non right-triangles.
Thanks for that video Cory; nice work on the multi-million property. Is there no chance of seeing the HVAC engineers' layout drawings to see where the mystery air handling unit ought to be? While you're in the West End, have a cheeky half of shandy in The Audley, the Hauser & Wirth art pub at the corner of Mount Street and South Audley Street in Mayfair. The electrics there are a work of art in themselves, I don't know who did their wiring - maybe it was you?
For reference, i remember when i was taught it was "why we use 110v transformers" because they go between +55 to -55 which is never more than "touch voltage"
I used to go to9 the Ritz on a Sunday evening for a drink. They had by far the best nibbles on the table than anyone else, the orange juice freshly squeezed by the bar man. The service was almost as good as Cory's.
Excellent video. In my country between the phases its 415v. I see you handle an unfamiliar job with confidence and stay level headed. Blessings keep the good work up
I don't know if you'll ever read this comment, but you should not put the fuse upstream of the surge arrester, it should be connected under the cbo switch without any protection, just to prevent the protection from being damaged when an overvoltage comes in.
Great channel, isn't pythagorus theorem based on a right angle triangle, A squared, plus B squared is C squared. Looks like trigonometry with a 120 degree, rather than 90 degrees. Sine, cosine and tangent? If you use 240 voltage x sin120, then divide that by sin30, you get 415. I think that's the one. Great work, great insight.. Nice work.
Ahh that’s so kind to say mate! More music will probably come out this year. Always making it, just don’t Really get the time to produce and release it. Gotta pick my focus right now. Take care and stay well! 😎⚡️ ❤️
As an electrician in Australia I just wanted to state that 230 volts is the RMS of the sine wave, The peak would be 325 Volts in this case and unfortunately Pythagoras theorem only works with right angled triangles and cannot be used in the way you say in your phasor diagram
It’s the same here, to be honest, it was just a little note scribble on the back on some cardboard off the top of my head! I didn’t think it would even make the video 😂. I’ve pinned a comment clarifying its RMS and Cosine
Good video, only thing i understand by now is than more expensive certain apartment gets the more useless appliances and light controls it has. No some ppl are just want everything which they barely use.
Cory it would be awesome if you did a video of how you got into Electrics, where you started , what type of work you've done, where you did your apprenticeship and how you obtained all your experience etc it would cool to know how it all started for you.
As we talked about last night pal. Old C4 install & quite poorly designed by the original installers. All the lighting panels I've ever built generally have 1x rcbo per dimmer module on C6 curve. I bet none of those are type A too... all those led lights potentially DC blocking the original circuit... more than likely the inrush of the lights causing it to trip.
Maths lesson time. The triangle you drew on the cardboard has two lengths of 230v joined at an angle of 120 degrees. Step 1: split the angle into two angles of 60 degrees by drawing a line down to the longest line in the original triangle. The line just drawn meets the longest line at 90 degrees, so you end up with two right angled triangles. The angles inside a triangle always add up to 180, so the third angle in each right angled triangle will be 30 and the longest side of each is still that 230v. Put this to one side, for the moment. Step 2, draw an equilateral triangle with all sides equal to 2. Each angle is the same (and they must all add up to 180) so each angle must be 60. Step 3, split one of the angles into two angles of 30 degrees by drawing a line through it (the technical term is bisecting the angle) and continue this line so that it meets the other side of the triangle. Again this line will be at 90 degrees to the side of the triangle, so again this is a right angled triangle with angles of 60 and 30 degrees. This time, though you know the long side of the right angled triangle (the hypotenuse) is 2 and the shortest side is 1 (because you split a side of the equilateral triangle of length 2 into two equal parts). Step 4, Pythagoras' theorem applies to right angled triangles (the sum of the square on the hypotenuse is equal to the sum of the squares on the other two sides). The square of the hypotenuse is 2*2=4, the square of one of the other sides is 1*1=1, meaning the square of the remaining side is 4-1=3. So that remaining side has length of the square root of 3 [or sqrt(3)] and the ratio of this side to the hypotenuse is sqrt(3)/2 (or the cosine of 60 degrees if you were taught trignometry). This ratio applies to all right angled triangles with internal angles of 30 and 60 degrees. Step 5, go back to the original "cardboard" triangle with its two right angle triangles and their shortest sides drawn back to back in Step 1. The length of the longest side of the original triangle is the twice the length of the "middle" side of one of the right angle triangles which in turn is sqrt(3)/2 times the hypotenuse (from Step 4). A consequence is that the distance between the two points of the original triangle is 230v times sqrt(3) or close to 400v, as you noted.
Great video Cory. Up there as one of my favorites of yours, nice to see the normal day to day chill jobs. Great to see Chili electrical make another appearance too, great guys!
Oh wow... Having all Leitungsschutzschalter on one phase is kinda silly? Btw if you are at it you should really ask the client about adding a Arc Fault Circuit Interrupter (AFCI), will save his ass from burning up after a few years and eg. Power sockets getting old
Great video cory! Found the information about trigonometry and pythagoras theorem very helpful as I am about to be doing my level 3 exams. Would be awesome if you could do a more indepth video about it.
I always find it interesting to see these expensive apartment's. Where I live you could have a house 3 times the size of that apartment and a yard with a garage for 1/20th of the cost.
I believe apartments like these are so expensive because they weren't really intended to be primary homes, but for very wealthy individuals to tie their assets up in.
Very good video as always. Be careful with that drink I got addicted to it, I was drinking loads. Really nice though. When that drill fell I thought you blew yourself up, glad you didn't.
Not all 3 phases are producing the same amount of power at the same time. Each phase's voltage and current move through zero at different times. And then if given time we could discuss phasor addition. Although I don't think I have a good enough command of the English language to comprehend such magical forces.
Great job but i hate to see singles in plastic trunking. I like a tool to access trunking lids usually plastic can be opened with bare hands. I know u didnt fit it
Control 4 seems to be very a expensive hardware based unifying solution for smart devices. I guess its easier to manage as a home owner otherwise I cant see why anybody would go for such a pricey solution when alternatives like Home Assistant are available for nothing.
This type testing stuff is new to me, in my country all standard DIN rail breakers fit in the same mask, different types will have different connections but the mask is the same across every brand.
Hi there! Pretty interesting job! Can you really use singles in a trunking that is not secured/ bolted together and hence access from untrained persons is easy?? Also the 3ph theory is correct but the Pythagorean theorem is only used on right angle triangles! Cheers!!!!
Awesome work Cory! Ive had the same situation with Units behind mirrors at work. Only our customer knew where it was and how to get to it. If it wasnt for the customer, we wouldve given up too😅
Couldn't quite tell from the vid, were those panels only partially numbered up on the wiring? Having done industrial panel building work I find it really l frustrating when people don't fully number them up and reference on a the drawing.
Pythagorus' theorem only works for right-angled triangles you need to use cosine rule : cosine(120)=(230^2+230^2-x^2)/(2*230*230) => -0.5=(52900+52900-x^2)/105800 => -52900=105800-x^2 => x^2=158700 => x=398
On September 17th, 2013 Paulus Schoutsen made the first commit for Home Assistant that started a snowball of Home Automation enthusiasts, Its nothing new, If anything a raspberry pi can be used as the main controller.
0:59 You're allowed to film in shopping centres until a member of management or security tell you not to. But, what kind of jobsworth tells someone filming their own face to stop? Are they afraid we're all going to descend onto the Burlington Arcade and buy everything?
I really wonder if there actually is a "no videoing" policy or is it does a personal preference by the person enforcing it. "No expectation of privacy in public" 🤔
@@Jay369 a landowner or authorised person can ask you to stop in a building they own. Although the public is naturally expected to be able to pass through an enclosed shopping area, you can have your access removed.
@Phillip Parr I'm genuinely interested in this. Anyone can ask anyone to stop recording but if you didn't and you were removed, would you have a case? If there is a no videoing policy in the shop or other then they would also be forfeiting the lawful use of CCTV? This whole recording thing has become a massive issue in the States and there's millions being forked out as a result of police intervention.
@@Jay369 As far as I'm aware by law in the UK, anyone can film anything anywhere, including on private land, until you're asked to leave. You can still stand on the public land outside of the private land and film into it completely legally, but owners do have a right to remove your access rights from land they own. You can also film from above with sub 250g drones, although you risk moving into trespass laws if you go below the roof line, and nuisance laws if you're continuously hovering over / flying around the same roof for an extended period. The biggest problem then becomes whether or not the person asking you to stop is the land owner / a representative of them, and occasionally whether the piece of land you're on is actually owned by them.
Hi Cory. Great to have the Cardboard Classroom back, Love the Trig. Next time Y and Delta Transformers and the beauty of their Design. Old Nicola Tesla is my hero.
I would absolutely love it if people would STOP saying it's 230 & 400 when it isn't. We all know the regs and paperwork has changed, but the voltages haven't. It's still 240 & 415 so can everyone please say it's 240 & 415.
small note pythagoras only works for RIGHT triangles but this one is isoceles so if you split in the middle you get 2 equal right triangles and get the result
Spent 4 years studying electrical engineering and I think you explained 3 ph voltages better than any of the lectures!
Thanks Phillip!
Just missed out that 230V is not the top of the wave but the RMS 😉
Absolutely - you explain so clearly Cory!
Wow. 4 years wasted pal!!
You need to watch some Joe Robinson's videos then.
at 9:30 you use "Pythagorus". Pythagorus is only for use in right angle triangles, because this is a 120 degree triangle between phases, the best geometric principal is called the cosine rule.
Came here to write this
Thanks Rory! Now I know 😁 - it’s been a long time since Trig 😂
@@corymac I did a mathematics degree before doing my apprentiship(in second year currently). My background sure makes learning in the class interesting.
Also the peak of the sine wave is not the 230V value.
230V is the rms (root mean square). The peak is around 325V from neutral point.
Final point. Could be worth pointing out how dangerous it can be to disconnect the neutral conductor in circumstances where safe isolation has not been done. (obviously not the case here) 😀
I was about to confidently suggest you can cut it in two similar triangles (30, 60, 90) and use pythagorus then. But I don't think that leaves you any better off as you only know the hypothenuse (and some angles)
The last sketch was truly informative, haven’t really connected why I always use 1.73.
You managed to teach me something that my old teachers didn’t get through to my below average brain.
I’ve always said that you always learn more from actually doing the job rather than from in the classroom.
So true @twosorts
I’m glad it was beneficial Kristian!
@@corymac ❤️
I•I =I’2😮 square root of 3
Nice job explaining the three phase vs single phase which are of course all RMS values (230, 415). Taking a look at the peak values is also very interesting 👍
Glad it was helpful!
👍
I think 'if in doubt ask' must be the standard CAD get out clause, I find it on every drawing I use. The 1.732 is derived from the Law of Sines for triangles rather than Pythagoras' theory. The sides of a triangle divided by the Sine of their opposite angles are all equal. VLine is opposite a 120 angle and VPhase is opposite a 30 angle. Setting VPhase to be 1V makes life easier, so you end up with 1V/Sin(30) = VLine/Sin(120). So 1V/0.5 = VLine/0.866, gives 2 = VLine/0.866. Re-arranging to find VLine gives, VLine = 0.866 x 2, which solving gives the 1.732 ratio.
You also end up with the same value if you draw out the vector sum diagram and then measure the resultant line between VPhase1 + (-VPhase2).
So true
I wish more people took that advice.
A very good explanation of 3phase, except peak voltage of each line is approx 320, the average is 240 (0.707 times peak voltage); total between lines approx 590 x 0.707 is 415. Also having over stuffed trunking you getting more heat, so you need bigger cables; making it even more stuffed. Bigger is always better.
Correct 👍🏼. But as per ‘the book’, thanks to the EU we are now on 230 volts, even though we aren’t 😂
Thanks for that! This is important to know when you start rectifying! 😛
👍
Crazy to think we can do all that automation on a simple server running home assistant.
Yep and that server can quite easily be a raspberry pi running a Linux based OS which is brilliant for networking and talking to other servers and controllers.
It's crazy what some people will pay for convenience.
@0:15 i luv that 2 thumb gesture... 🥳😋 it also was in Supernatural S7E6 @~18m40s
👍🏼👍🏼
Great video Cory. Touching on the note (if in doubt, ask). Absolutely! There's no such thing as a stupid question. If you don't know you ask someone who does. It's the only way we learn.
"The day we think we know everything, is the day we stop learning anything." ~ TheCod3r, 2019
True!
Only "stupid" thing to do is to not ask the questions.
That little note is on almost every wiring schematic I've built a panel to over many years of electrical engineering
Hi Cory, I have just started my apprenticeship 7months ago doing domestic. How were you able to get knowledge/experience of stuff outside just regular domestic work(fuse board changes, new lights, rewires). Seeing you going abroad and working on these cool projects is really inspiring but I have no idea how these opportunities would even arise. Cheers!
That’s awesome man! I’ve just gained experience from constantly trying to put myself out of my comfort zone, and not being afraid to ask for more responsibilities. Get the basics down, and then follow your curiosity. You’ll smash it mate, it’s a fantastic and broad industry
How do you find the apprenticeship?
One thing I would say to you is to try not get overwhelmed. The electrical industustry is forever changing and extremely challenging. Just take each day as it comes.
Nice explanation but it is worth pointing out that on the waveform showing the sine waves for each phase the maximum voltage isn't 230v as 230v is the nominal RMS (root mean square) figure - the actual voltage at the peaks will be up to 357v or thereabouts - it depends on the actual voltage delivered which in the UK can be as high as 253v RMS. This is why the insulation ratings on cables are based on the maximum peak voltage rather than the RMS and so seem larger.
You’re correct! I’ve pinned the comment, and will make a video on RMS soon. I just kept it simple for now to understand the premise of three phase, also, I was just coming out of a flu as you’ll probably hear in my voice 😂. Thanks for pointing it out!
@9:39 i would use the "law of cosines": c²=a²+b²-2·a·b·cos 120° where a=b=230 hence c=sq.root(2·230²·(1-cos 120°))=230·sq.root(2-2·cos 120°)=230·sq.root(2-2·(-0.5))=230·sq.root(3) since cos 120°=-0.5
Falling torch made me jump. Thought something went into the 3 phase board and shorted/tripped. Learnt something new too with the phase angle explanation. Great work as always, keep these coming.
Me too! 🤕
Banging on the cover and "boom" 😮😂
As I hope people have already mentioned... The peak voltage of each phase is 340v, not 240v. 240v is the RMS value or "equivalent DC value"... i.e a DC voltage of 240v will deliver the same power across a resistive load as 240v AC.
Why is RMS the "standard" used term and not the peak?
@@Jay369 if you connect 240v DC and 240v AC RMS to the same resistive heating element, it will deliver the same temperature so back in the early days of the grid when they were battling over whether it should be AC or DC, I guess they needed a way of expressing an equivalence with the DC system.
@@Chris-hy6jy
Thanks for the reply. Much appreciated 👍
Another fascinating vid. Nice one matey.
I would bet the correction factor for those cables in the trunking was not considered let alone the space factor at 45%.....
It hurts my eyes😢
230 volts times square root of 3 or 1.732=400volts, no one phase is reaching it's peak at the same time. Each phase is 120 electrical degrees apart. In the US, most common nominal systems are 277v/480v or 120v/208v. Canada also has 347v/600volt systems.
Literally just explained this three phase theory this morning 👏🏻 always good to have what you say confirmed 😁
Perfect!
Nice video Cory. I like the importance you allocate lunch in the program of works. Top job.
Thanks Mark! Lunch is what I wake up for my friend
@@corymac preaching to the converted lol.
😂
Just when I thought Corey couldn’t get any cooler he puts mac demarco on a video
Brilliant work, love your theory explanations 👍🏼👍🏼
Thank you!
As per Control 4 warranty all C4 modules have to be mounted vertically not horizontally as can void warranty
Interesting! The whole panel design is really naf unfortunately.
Corey this isn’t a dig at all and I’m sorry if this come around like it is, I was just pointing it out to you to make you aware, love all your content, keep the great work up
Those ethernet cable routes are all jank too
Just subscribed to your channel after coming across Artisan Electrics, you take pride and care in your work, it's so intricate what you do, very interesting.
Welcome aboard!
500th comment wins a prize! 🏆 ( for subscribers only! )
Please note, the 230volts and 400volts values are ‘RMS’ ( or root mean squared values ). Also, it’s Cosine! I wasn’t expecting my post flu brain cardboard scratchings to actually make it into the video 😂. I’ll make these subjects a video asap! 😉
Does it count if I spam comments, first one would be something like 3 and then I’ll work my way up
@@kristiangoransson6104 I’d say post your favourite 500 ØY quotes 😂
230 rms arent you actually getting 325 volts the fact that your meter is rms ? So would it be 400 v rms or is it actually 400v “true voltage “ if that makes any sense … thanks Cory!
When I trained as a Carpenter in the 80's the Electrician apprentices I worked with said 3 phase was one of the hardest parts to learn.
It’s tricky, but once it clicks it makes sense!
Hi buddy sorry not been commenting last few vids but been on some strong medication and just wanted to say never stop doing this work it is you 1000% your top in all you do and take time out to explain all that you do, love to all. X
Sorry to hear that woody! I hope all is well, am I remembering right that I installed a charger for you many moons back with Artisan? Thanks for the support
@@corymac hi Cory unfortunately that was not me buddy, I’ve got cancer undergoing therapy for the next two years it ant going to win,,,,,, so when you get the big jobs that need containment and all well I am free just sitting here, you be safe and don’t stop never give in,, love to all. X
So Sorry to hear that Woody. All the best with your treatment, you can do it! Diamonds are made under pressure
@@corymac thanks Cory that’s kind of you buddy I will never give in or stop as a single parent of three there no time for me,,,,,,, plus being off from work since 2019 I’ve got the cleanest power tools hand tools drill bits plumbing equipment door control /access cctv tools,,, my daughter has a skip in mind to free up space which I understand but with a heavy heart BUDDY I thought well with my fingers crossed more like it that there would be someone that would give this old boy a chance to shine once more or a few times would be nice. You be safe please and take care in all you do, and never stop. Love to all. Woody xxxxx
}
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Pythagoras only works for right-angle triangles. You could split that triangle in half to use it though
Good to see you bringing this up, but the 230 V of a single phase to earth/neutral is the RMS voltage. Nearly all multimeters give you the RMS value which is equivalent to the heating effect of 230 Vdc. Drawing 230 at the peak of the AC waveform is incorrect and could confuse the youngsters.
Correct, my bad for not being clearer
Love your content pal, so happy for you that you set up on your own. You were always too good to be working for someone 🙏👌🔥🔥🔥
Much appreciated
SPD should go where the 63A C type breaker was fitted, great the way you explain the supply, I've learnt something great vid
Glad it helped
Crabtree make a SPD kit for these DB's and they definitely don't go where the MCB is. The last one I fitted comes with a Din rail bracket to mount inside the enclosure low down on the left hand side. They even have a knock-out on the cover ready for the SPD
Why split up the 3-phase and 1-phase breaker boxes? Here in Sweden most breaker boxes/distribution boxes have a 3-phase feed and then you just connect a busbar into the faultprotector with all the breakers. Then every third breaker have the same phase so the load is automatically better balanced.
That’s because Sweden, in general, has better habits than the uk electrically
Not necessarily automatically. Some planning is needed in regards to circuit allocation.
Really enjoyed working in Stockholm a few years back 👍
So that’s the second use for trig I have found outside of school. The first is surveying and total stations.
Hi, Cory. Love the electrical content you've been posting. you'll find that the pythagorean theorem wont solve that type of triangle, the Cosine Rule is the appropriate method for non right-triangles.
Thanks for that video Cory; nice work on the multi-million property. Is there no chance of seeing the HVAC engineers' layout drawings to see where the mystery air handling unit ought to be?
While you're in the West End, have a cheeky half of shandy in The Audley, the Hauser & Wirth art pub at the corner of Mount Street and South Audley Street in Mayfair. The electrics there are a work of art in themselves, I don't know who did their wiring - maybe it was you?
For reference, i remember when i was taught it was "why we use 110v transformers" because they go between +55 to -55 which is never more than "touch voltage"
That’s a CTE - As explained in the previous comment :)
starting to think this cupboard should contain an industrial sized cabinet (say 2m tall, 1m wide or so, with a dozen of horizontal DIN rails)...
Nice video, shame you can see the crap trace heating install. I worked on these around 8 years ago.
I used to go to9 the Ritz on a Sunday evening for a drink. They had by far the best nibbles on the table than anyone else, the orange juice freshly squeezed by the bar man. The service was almost as good as Cory's.
😎🤌🏼
Excellent video. In my country between the phases its 415v. I see you handle an unfamiliar job with confidence and stay level headed.
Blessings keep the good work up
Peak times is probably around 400V (?)
I don't know if you'll ever read this comment, but you should not put the fuse upstream of the surge arrester, it should be connected under the cbo switch without any protection, just to prevent the protection from being damaged when an overvoltage comes in.
SPD’s need overcurrent protection. They either will have internal, or external where the manufacturer specified an MCB. Is this case it’s external.
@@corymac fuse is required only for short circuit not for over current
Speak to the manufacturer 👍🏼
"According to BS 7671, all SPDs shall be protected from over current, which can be done through the use of an MCB or internal fuse."
Love the video, only got crazy from the out of focus on the control 4's
You and me both!
Great channel, isn't pythagorus theorem based on a right angle triangle, A squared, plus B squared is C squared. Looks like trigonometry with a 120 degree, rather than 90 degrees. Sine, cosine and tangent?
If you use 240 voltage x sin120, then divide that by sin30, you get 415. I think that's the one.
Great work, great insight..
Nice work.
You’re right!
@@corymac Need any tips on fibre, let me know. I have a wealth of knowledge and experience too on that.
Absolutely love everything you do, had your music on loop basically. Would love to hear more, but I get you're super duper busy atm. Mad respect
Ahh that’s so kind to say mate! More music will probably come out this year. Always making it, just don’t Really get the time to produce and release it. Gotta pick my focus right now. Take care and stay well! 😎⚡️ ❤️
As an electrician in Australia I just wanted to state that 230 volts is the RMS of the sine wave, The peak would be 325 Volts in this case and unfortunately Pythagoras theorem only works with right angled triangles and cannot be used in the way you say in your phasor diagram
It’s the same here, to be honest, it was just a little note scribble on the back on some cardboard off the top of my head! I didn’t think it would even make the video 😂. I’ve pinned a comment clarifying its RMS and Cosine
Good video, only thing i understand by now is than more expensive certain apartment gets the more useless appliances and light controls it has. No some ppl are just want everything which they barely use.
Cory it would be awesome if you did a video of how you got into Electrics, where you started , what type of work you've done, where you did your apprenticeship and how you obtained all your experience etc it would cool to know how it all started for you.
I’m about to release a members only video on this very subject 😃
@@corymac Great im going to become a member then :)
👍
As we talked about last night pal. Old C4 install & quite poorly designed by the original installers. All the lighting panels I've ever built generally have 1x rcbo per dimmer module on C6 curve. I bet none of those are type A too... all those led lights potentially DC blocking the original circuit... more than likely the inrush of the lights causing it to trip.
Yeah, it’s a dumb way of doing it!
@13:41 nearly gave me a heart attack 😂. ‘Nothing but heavy duty straight to my brain’ . You’re too funny 😂
You went all John Ward on us but it was good!
The guy that taught me all I know 😂
😂
Maths lesson time. The triangle you drew on the cardboard has two lengths of 230v joined at an angle of 120 degrees. Step 1: split the angle into two angles of 60 degrees by drawing a line down to the longest line in the original triangle. The line just drawn meets the longest line at 90 degrees, so you end up with two right angled triangles. The angles inside a triangle always add up to 180, so the third angle in each right angled triangle will be 30 and the longest side of each is still that 230v. Put this to one side, for the moment. Step 2, draw an equilateral triangle with all sides equal to 2. Each angle is the same (and they must all add up to 180) so each angle must be 60. Step 3, split one of the angles into two angles of 30 degrees by drawing a line through it (the technical term is bisecting the angle) and continue this line so that it meets the other side of the triangle. Again this line will be at 90 degrees to the side of the triangle, so again this is a right angled triangle with angles of 60 and 30 degrees. This time, though you know the long side of the right angled triangle (the hypotenuse) is 2 and the shortest side is 1 (because you split a side of the equilateral triangle of length 2 into two equal parts). Step 4, Pythagoras' theorem applies to right angled triangles (the sum of the square on the hypotenuse is equal to the sum of the squares on the other two sides). The square of the hypotenuse is 2*2=4, the square of one of the other sides is 1*1=1, meaning the square of the remaining side is 4-1=3. So that remaining side has length of the square root of 3 [or sqrt(3)] and the ratio of this side to the hypotenuse is sqrt(3)/2 (or the cosine of 60 degrees if you were taught trignometry). This ratio applies to all right angled triangles with internal angles of 30 and 60 degrees. Step 5, go back to the original "cardboard" triangle with its two right angle triangles and their shortest sides drawn back to back in Step 1. The length of the longest side of the original triangle is the twice the length of the "middle" side of one of the right angle triangles which in turn is sqrt(3)/2 times the hypotenuse (from Step 4). A consequence is that the distance between the two points of the original triangle is 230v times sqrt(3) or close to 400v, as you noted.
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Noiiiiiiiiiice Appartment. Great video Cory
Glad you enjoyed it!
Great video Cory. Up there as one of my favorites of yours, nice to see the normal day to day chill jobs. Great to see Chili electrical make another appearance too, great guys!
Glad you enjoyed it. 🌶️ are legends
Brilliant work and another great video, very interesting!
Glad you enjoyed it
Oh wow... Having all Leitungsschutzschalter on one phase is kinda silly?
Btw if you are at it you should really ask the client about adding a Arc Fault Circuit Interrupter (AFCI), will save his ass from burning up after a few years and eg. Power sockets getting old
Every vlog is so good to watch and always worth the wait.
Glad you like them!
i love what control 4 can do a good friend of mine has it in his home i just wish it wasn’t such a expensive setup
It’s pretty great!
Good stuff.Always something interesting with your videos
I appreciate that!
Could the other circuit be the boost switch for the MVHR. Possible there would be a Mev unit usually you can hear it humming
Another informative and engaging video that people can really take something away from. Great work echoed by the comments.
Glad you enjoyed it!
Great video cory! Found the information about trigonometry and pythagoras theorem very helpful as I am about to be doing my level 3 exams. Would be awesome if you could do a more indepth video about it.
Glad it was helpful!
I’ll be making a series of shorts on these subjects asap Connor
your explanation of 400v for 3P was great, thank you
You are welcome!
Pythag can only be used on right angle triangles. However trigonometry can be used instead.
You could divide the triangle in half to make 2 right angle triangles. Then "Ghetto" Pythagoras - "Pythag" 😂 would work
For a high end client those pannels should look much better in terms of cable management and labelling at the very least.
I always find it interesting to see these expensive apartment's. Where I live you could have a house 3 times the size of that apartment and a yard with a garage for 1/20th of the cost.
Its close to where they work and a status symbol. And most of the people that own these apartments also have vacation properties.
I believe apartments like these are so expensive because they weren't really intended to be primary homes, but for very wealthy individuals to tie their assets up in.
Very good video as always. Be careful with that drink I got addicted to it, I was drinking loads. Really nice though. When that drill fell I thought you blew yourself up, glad you didn't.
Thanks!
Not all 3 phases are producing the same amount of power at the same time.
Each phase's voltage and current move through zero at different times.
And then if given time we could discuss phasor addition. Although I don't think I have a good enough command of the English language to comprehend such magical forces.
Ok, phasor addition and harmonics coming soon 😂😅
@@corymac
Hope you play a harmonica for your intro.
Looks like they’ve used MCBs designed for the 3phase Crabtree board
Great job but i hate to see singles in plastic trunking. I like a tool to access trunking lids usually plastic can be opened with bare hands. I know u didnt fit it
Control 4 seems to be very a expensive hardware based unifying solution for smart devices. I guess its easier to manage as a home owner otherwise I cant see why anybody would go for such a pricey solution when alternatives like Home Assistant are available for nothing.
having retired from nearly 50 yrs in electric/electronics/ computer networks thats the first time I have ‘understood’ threephase values😊
Glad it helped Alan
Great video, studying second year as an electrician in Sweden. New sub earned!
Welcome aboard!
Probably the most knowledgeable electrician on TH-cam genius
I'm glad you use the torch designed by Apple but costs the same as a Unilite.
I am in doubt! ;-) What is the maximum permitted length of the cables to the SPD...?
Great videos as always, just not often enough!!! Keep up the great work🤙
More to come! It’s hard to keep up quality with quantity as it’s super expensive and time consuming making videos
@@corymac wasn't a criticism it's just great to see quality work with comedic value 😁 I have learnt a lot from all your content.
Super expensive and time consuming is a poor excuse.
We need more entertainment!!!!!!!! 😂
Great video as always Cory 👍
Glad you enjoyed it!
692 is another way to make the formula but is often easier to remember for 3 phase power of onsite
Is that assuming 400v?
This type testing stuff is new to me, in my country all standard DIN rail breakers fit in the same mask, different types will have different connections but the mask is the same across every brand.
Is that in Hungary?
@@Jay369 Yes
Hi there! Pretty interesting job! Can you really use singles in a trunking that is not secured/ bolted together and hence access from untrained persons is easy?? Also the 3ph theory is correct but the Pythagorean theorem is only used on right angle triangles! Cheers!!!!
Singles in trunking is acceptable according to the regs
Awesome work Cory! Ive had the same situation with Units behind mirrors at work. Only our customer knew where it was and how to get to it. If it wasnt for the customer, we wouldve given up too😅
😂😅
👍
Couldn't quite tell from the vid, were those panels only partially numbered up on the wiring?
Having done industrial panel building work I find it really l frustrating when people don't fully number them up and reference on a the drawing.
They were barely labelled or number at all in any legible way 😩
Amazing video with fantastic educational value!
Glad you enjoyed it!
Pythagorus' theorem only works for right-angled triangles you need to use cosine rule :
cosine(120)=(230^2+230^2-x^2)/(2*230*230)
=> -0.5=(52900+52900-x^2)/105800
=> -52900=105800-x^2
=> x^2=158700
=> x=398
👍
Corey, you would make a great teacher!
Thank you!
Superb video Cory, I learnt a lot in this one!
Glad to hear it!
Pythagoras theorem can only be used with right angle triangles. :)
Correct! I meant cosine haha
On September 17th, 2013 Paulus Schoutsen made the first commit for Home Assistant that started a snowball of Home Automation enthusiasts, Its nothing new, If anything a raspberry pi can be used as the main controller.
0:59 You're allowed to film in shopping centres until a member of management or security tell you not to. But, what kind of jobsworth tells someone filming their own face to stop? Are they afraid we're all going to descend onto the Burlington Arcade and buy everything?
😂
I really wonder if there actually is a "no videoing" policy or is it does a personal preference by the person enforcing it.
"No expectation of privacy in public" 🤔
@@Jay369 a landowner or authorised person can ask you to stop in a building they own. Although the public is naturally expected to be able to pass through an enclosed shopping area, you can have your access removed.
@Phillip Parr
I'm genuinely interested in this.
Anyone can ask anyone to stop recording but if you didn't and you were removed, would you have a case? If there is a no videoing policy in the shop or other then they would also be forfeiting the lawful use of CCTV?
This whole recording thing has become a massive issue in the States and there's millions being forked out as a result of police intervention.
@@Jay369 As far as I'm aware by law in the UK, anyone can film anything anywhere, including on private land, until you're asked to leave. You can still stand on the public land outside of the private land and film into it completely legally, but owners do have a right to remove your access rights from land they own. You can also film from above with sub 250g drones, although you risk moving into trespass laws if you go below the roof line, and nuisance laws if you're continuously hovering over / flying around the same roof for an extended period. The biggest problem then becomes whether or not the person asking you to stop is the land owner / a representative of them, and occasionally whether the piece of land you're on is actually owned by them.
"You're never too good to make a mistake" 👏👏
Loving the mac demarco
A man of taste I see
I came here to say this
Hi Cory.
Great to have the Cardboard Classroom back, Love the Trig. Next time Y and Delta Transformers and the beauty of their Design. Old Nicola Tesla is my hero.
Thanks Eamonn!
Also love your 3-phase explanation.
Nice video, I like the drawn explanation. I always thought it was +120v to -120v giving us the 240v range?
That’s in a CTE transformer, ( centre tapped earth ). Commonly used on building sites :)
We don’t tend to CT the earth on our transformers in the uk grid.
There is no + and - . Its AC, not DC
I would absolutely love it if people would STOP saying it's 230 & 400 when it isn't.
We all know the regs and paperwork has changed, but the voltages haven't. It's still 240 & 415 so can everyone please say it's 240 & 415.
😂😂 I’m with you
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Is the SPD cable length not greater than 0.5M?
Check that reg again closer, and in context of a three phase scenario and then come back to me 🤓
@@corymac OK, I'll look. I thought you would have a reason.....
That trunking would give me nightmares, imagine doing a grouping calculation on those cables, yikes.
You actually use the Law of Sines, not Pythagoras' theorem. Pythagoras' theroem requires a right triangle (one corner at 90 degrees)
You’re right!
Yet another great video! Thanks Cory! 😊
My pleasure!
Liking the 3 phase explanation. Bets the normal reply from some of it just is ok.