Why Circuit Breakers DON'T Protect People (electric shocks)
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27 днів томуHow do MCB's work? Get a 30 day free trial and 20% off an annual subscription.🎁 Click here: brilliant.org/EngineeringMindset
How do miniature circuit breaks (MCB) work and why do they protect cables not people. What makes the trip, what happens inside, where are they used and how do we read the charts.
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@EngineeringMindset 25 днів тому
*This free video took weeks to make!* if it helped you and you'd like to thank or support Paul's efforts, link below: PayPal: www.paypal.me/TheEngineerinMindset Patreon: www.patreon.com/theengineeringmindset Channel membership: ukposts.info/the/k0fGHsCEzGig-rSzkfCjMw.htmljoin
@windowsgaming-dn9qx 25 днів тому
how many times did you zap yourself
@Win11FTW 23 дні тому
Yeah it true
@BeaulieuTodd 21 день тому
The video literally stated just that, right from very start.
@philpeko1796 20 днів тому
Congratulations for achieving such a useful, educating, yet understandable channel, and thank you for your work. Loing time s subscriber, I wanted to thank you using some of your Amazon affiliates Tools links, but almost half of them are broken, or products are unavailable. May I know when you could update them, and keep us posted? Peace & Prosper! ❤ & 🖖
@michaelm6597 20 днів тому
I knew immediately where you were going with the name of the video and was well done. This gave extremely good insight to how breakers work and I personally loved the bits showing how they trigger with the side removed (especially as I would never remove the side of one myself)
@thomasvlaskampiii6850 25 днів тому
The fact that you replied to my comment from 3 years ago and gave a link to this video was a nice gesture. I appreciate it
@EngineeringMindset 25 днів тому
It took a while to make, but I hope you enjoy the video
@2Pzp 21 день тому
@@EngineeringMindset Not every hero wears a cape
@Ryuken2721 20 днів тому
great stuff takes time.
@tanithrosenbaum 20 днів тому
@@2Pzp Engineering heroes wear shirts, ties, jeans and tennis shoes :)
@xTerminatorAndy 24 дні тому
This is a gold standard for showing how breakers work. Very pleased with that
@TishaHayes 20 днів тому
As an electrical engineer I have repeatedly attempted to explain circuit breaker operation and curves to technicians and electricians. No matter how extensive (or simplistic) I make my explanation it ends up with them offering up a sceptical look and them just accepting the answer without really gaining an understanding. This is an excellent video; I shall share this as the teaching video for breakers. Thanks so much for putting the effort in to creating it.
@johnchestnut5340 20 днів тому
You interact with the wrong technicians. I started in engineering and moved to technology. I ran out of money before finishing. I assure you that this is covered in technology classes. Electricians are at least introduced to this information. Perhaps the teachers are more knowledgeable than competent?
@bladeoflucatiel 19 днів тому
its not rocket science, you should start by showing them actual manufacturers datasheets (hager, abb, siemens) instead of generic theoretical curves and going item by item and what they mean. Buy a couple of diferent types of breakers and pass they around during class. You should also mention its more about the country regulations than actual specs requirements, for instance in the UK they use type B breaker with 6000amps breaking capacity, while in europe its C type 3000amps.
@GregoVal 18 днів тому
I don't know where these electricians came from. But any certified electrical technician should know something as basic as how electrical protections work.
@laus9953 12 днів тому
@@bladeoflucatielno, he shouldn't - his presentation is fine the way it is ! your country specs statement is wrong.
@JoaoVictor-hz4rm 25 днів тому
I'm loving this more live-action kind of videos
@EngineeringMindset 25 днів тому
Glad to hear, will be doing more of them where possible
@JoaoVictor-hz4rm 25 днів тому
@EngineeringMindset glad to hear, today's videos are becoming more and more made without love or even with AI in some extent, you're putting more and more of your personality in your content
@thawzinkhant1759 24 дні тому
I concur
@tuckkeongho 24 дні тому
This is about the best video explaining how a MCB works. Well done.
@AtAGlimpse_UB 24 дні тому
Dude, the transitions are so freaking mind boggling! Great Job Paul!
@EngineeringMindset 24 дні тому
Thank you, glad you liked the hard work
@gg-gn3re 22 дні тому
@13:00 good to add that the arc chamber is "up" aka away from gravity. The arc travels up as heat rises due to gravity. If you install breakers upside down you can actually get good arcs to melt internals instead. It's a fun exercise lol awesome video as always
@FilinMXr 20 днів тому
I was just wondering why arc moves upward, thank you
@thebamplayer 20 днів тому
Also the resulting magnetic field moves the arc away.
@ImieNazwiskoOK 20 днів тому
Seems like circuit breakers for the ISS might be bit more tricky(aside from a lot of them having to work on DC voltage)
@gg-gn3re 20 днів тому
@@ImieNazwiskoOK Yea even DC breakers on earth are designed differently/specific to DC. Getting the arc killed on DC is much more difficult as well I wonder how the space station ones look but the magnetic field up there probably takes priority thus it may not need much of a design difference. Down on earth it's so weak that the heat matters more and heat rises due to gravity
@jhanthony2 25 днів тому
Those circuit-breaker graphs are great! I learned a lot from this.
@altuber99_athlete 23 дні тому
They are called trip curves.
@somedude4805 20 днів тому
They’re not meant to protect people, they’re meant to protect circuits. That’s why they’re called “circuit breakers” and not “people protectors”.
@leeroyjenkins0 20 днів тому
They're meant to bag air, not to protect people. That's why they're called "air bags" not "people protectors" Filling the bag with air is a means to protect people. So could be breaking the circuit. Logic doesn't seem to hold up.
@icyboyy6177 20 днів тому
@@leeroyjenkins0we should call every thing that protects people: “people protector”. Helmet? People protector. Epinephrine pen? People protector!
@quinnwhite8761 20 днів тому
@@leeroyjenkins0no. they are not designed to protect people. circuit breakers, more properly known as overcurrent protection devices (OCPD) stop the flow of electricity in the event of an overcurrent to stop the wires from heating up. its to protect the insulation of the wires, not people.
@JPK1337 20 днів тому
he's right tho.. circuit breakers are supposed to save the circuits inside the walls from getting destroyed. they are not for safety. that's what an rcd is for. @@leeroyjenkins0
@idonjohnson6999 20 днів тому
So you could say they break people.
@TheEulerID 25 днів тому
The title is a bit misleading. True, MCBs do not protect people from fatal electric shocks. However, they do protect people from electrical fires due to overloads and, statistically speaking, electrical fires have been a much killer of people than electric shocks (particularly in the USA I should add, partly because of the way they build houses). To say that it is just there to protect property is simply not the case. Also, some MCBs are twin pole, although that's more an industrial and European domestic thing (at least in some countries). However, excellent job at explaining how MCBs work, and especially the dual-mode switching and why it's done that way. I note, there is still no mention of RCBOs. Those dual RCD consumer units are, thankfully, rapidly being confined to history and many electricians will no longer quote for split RCD CUs, and I'm a bit surprised that the regulations still allow them. Of course, then we come onto a far more contentious point, which as AFDDs.
@EngineeringMindset 24 дні тому
Glad you enjoyed the video, note that RCD, RCBO etc will be covered in detail in dedicated videos. You have some good points but I will also add, and I'm sure you're already aware, but the MCB will only prevent (hopefully) a fire occurring from an overloaded cable, for example fixed wiring in the wall. But, most fires in homes start from faulty appliances. For example, if the decorative casing on a toaster catches fire, the MCB won't trip, it will happily keep providing power and heat to the fire until the entire house is ablaze. It will only trip when it detects a short or overload from something melting and creating a low resistance path. However, if someone drives a nail through the line and neutral when hanging a picture frame, it will detect this and cut the power, otherwise the nail would start glowing red and cause a fire. So it will only prevent certain fires. It won't prevent electric shocks, which I think most people believe is the case.
@muulsh5341 22 дні тому
I was wondering what is the difference between single and twin pole ? In my breaker panel (in France) everything is a c type twin pole and I heard from a video by a french electrician that single pole was used before but it's no longer the case and less safe
@tomr6955 22 дні тому
I've seen misleading titles in my time and this is NOT the hill to die on
@S-mz2my 22 дні тому
single pole is for the live wire of a unique circuit -double or twin pole is FOR THE same circuit protection of the neutral wire @@muulsh5341
@yourfaceisonfire 22 дні тому
I’m an electrotechnology lecturer, we teach our students the same thing by starting with the “breakers protect cable, RCDs protect people” in service of making the distinction between their designed purpose.
@luispereira3 24 дні тому
Love the new format and the face behind the hard work! Thank you Paul for sharing the knowledge with the world, I've learnt so much from your videos!
@HimalayanYeti 24 дні тому
This is amazing!! The depth and simplicity of the explanation is just brilliant!!
@tedchirvasiu 21 день тому
.org
@JackCobalt 20 днів тому
I'm glad you said qualified and competent at 4:20, because I've seen a lot of people who are competent who think they're qualified, and people who are qualified but aren't quite competent 😂😂
@melliflousbufo 19 днів тому
Utterly brilliant description - thanks so much for taking the time to put this together!
@skysurferuk 18 днів тому
A clear, concise explanation of these magical devices. Awesome, & many thanks for your work. 👍
@IrisNebula7023 20 днів тому
Awesome video, very well explained concepts. I had to learn everything in this about a year ago, but it took a friend hinting me to the right direction and a whole afternoon of studying, this would had a been great help 😊
@__u__9464 19 днів тому
This was easily the best video I've ever seen on this topic in my whole life. Top tier quality right here
@theavchap 19 днів тому
The clearest and simplest demonstration and explanation of how this works. Excellent work!
@thorbjrnschnellthanner2642 21 день тому
Its wild how much engineering and thoughts have gone into these circut breakers. Well explained, easy to digest.
@Logical19 20 днів тому
i just stumbled across this channel and i LOVE it! this really helps with understanding things like this. ive always wondered about. thank you!
@rahul2000 18 днів тому
bro have one of the best engineering channels i have learnt a lot from you despite being a mechanical engineer myself about electrical as i also had a specializing in automation
@Felipe_Nogueira 20 днів тому
The best class about circuit breakers I'd seen!! Congratulations for the content!
@Ryan-cm5rm 21 день тому
This is a really well produced video! Great job!
@allangibson8494 22 дні тому
MCB’s can be safely mixed because they are designed to a common mechanical and electrical standard. Different manufacturers only becomes an issue if a distribution comb is used but that can even be an issue even with in a specific brand. The leading letter refers to the trip curve which goes beyond B, C and D - “A” being fastest and “F” being slowest (and usually used for variable speed motor circuits (and occasionally switch mode power supplies with high inrush currents). C curve breakers are the most common in domestic use. Direct On Line started motors typically draw seven times the running current during start. Hard Start Switch Mode Power Supplies draw their full output load current during starting - so a 5V 1000A supply will draw 1000A for the first fraction of a cycle until the output reaches 5V - so from a 240V supply 240kW (and having tripped a gas fired power station offline by turning on a computer system, this could happen (steady state the system drew 1kW - the power supplies were oversized and redundant (2off)).
@themohaa2 19 днів тому
The only problem with this is that you will void any potential warranty the manufacturers give you, as it wasn’t used as they intended. Also, you cannot use that manufacturers electrical data/certification as this was only done based on their own parts. So if there was a house fire and they find out you have mixed breakers, etc, there’s no come back. Also on odd occasions the breakers just won’t physically fit in each other’s boards when the front plate is attached.
@allangibson8494 19 днів тому
@@themohaa2 Mixed breakers are legal if installed correctly. If they don’t fit the manufacturer is selling non standards compliant equipment. Thats what standards are for - to ensure interoperability and interchangeability. BTW - my home switch board has five different manufacturers breakers installed, no problems because they are signed off by an electrical inspector. I have however had issues with incompetent electricians not tightening screws repeatedly.
@laus9953 12 днів тому
"C" - type MCBs are most UNcommon in domestic installations.
@allangibson8494 12 днів тому
@@laus9953 Which will come as a surprise to every electrician I have worked with - every house I have lived in was fitted with “C” curve breakers (including the ones on the solar panels). I’ve used “D” curve breakers on switch-mode power supplies in special cases and “A” curve on thyristor controlled heaters (to protect the thyristors). RCD breakers are a design requirement where I work too on all power circuits.
@MrDreugh 20 днів тому
Awesome video! I have never seen a video by you before, but I am glad I did. Keep up the good work 👍🏻 (I subscribed)
@arjun-vh7np 19 днів тому
You are the only electrical engineer i have noticed explaining the breaker selection chart clearly and neatly....do more videos brother keep it up....
@AJTarnas 22 години тому
incredible detail. above and beyond all other explanations. fantastic work.
@kushanchathuranga2707 22 дні тому
Incredibly informative video, best video for explaining the MCB function, you are great man... ❤❤
@nikolaskurnia7404 19 днів тому
This explanation is so good!! Definitely need more of these videos, from RCD to medium voltage devices
@timothysands5537 21 день тому
Phenomenal video. I thought I understood breakers, but I never once looked at the trip charts nor had I noticed the Arc chamber. Thank you for this!
@parthasinha7311 19 днів тому
Excellent video! Thanks for creating such a high quality video on circuit breakers. Learning becomes so easy with visualization of the operation.
@pcfreak1992 17 днів тому
This video has one of the best animations I have ever seen in an engineering video, good job! 👏
@LovSven2011 19 днів тому
Great visual explanation of Circut breaker parts and operation. Liked! 🙂
@AlmightyPyro 19 днів тому
this is the best video i’ve seen about this topic.
@smarteth4342 25 днів тому
I really love your videos. you made me more attached to the electrical concepts. thank you so much with much respect.😍😍
@EngineeringMindset 25 днів тому
Glad you like them!
@jamesbensley7914 20 днів тому
Explained so well, Will save this for future teaching of remedials.
@ukaszk3755 22 дні тому
Great video. I like your animation and cross-section efect. It realy help to understand.
@mysterion4301 18 днів тому
As a young apprentice back in 1974 I was taught that the amperage you have to worry about killing you is "any amperage that is enough to stop your heart." In the US people tend to think that's either 15 amps or 20 amps because those are the most common sizes for breakers in their home's panel.
@PlayboyHZ 17 днів тому
100mA is potentially enough to stop your heart. It also depends on the voltage
@mathiastomixd 2 дні тому
Best Video I have seen in a while, so good explained and detailed :)
@bjornroesbeke 24 дні тому
Pointing out what the "3000/4500/6000/10000" is for would fit this video well. All too often i hear people (even colleagues) say "it can handle 10000 volts" and they refuse to accept that it means Icu or maximum breakable short circuit current.
@EngineeringMindset 24 дні тому
Good point, If the video is popular I can follow up with some additional info.
@techtechnicalgaming 25 днів тому
As always loved your videos ❤ and please make videos on other types of transistors and their uses❤❤
@muffinglish 20 днів тому
Great explanation and corresponding video. I was interested in trying to answer the question of which uses more energy -cordless or plug in vacuum cleaner.
@richardcampbell4506 20 днів тому
What a fantastically clear and detailed explanation of an everyday item. Thanks
@thanhheu4129 25 днів тому
Thank you. Your videos have a huge education value and absolutely are informative, i learnt new things about CBs i didn't know before. Thank you 🙏☺️
@EngineeringMindset 24 дні тому
Glad to help!
@robertnull 20 днів тому
I'm new on this channel, I'm amazed how high quality this video was! Kudos!
@datadrivendave 21 день тому
My dad asked me just last week how breakers work. I knew there was a bimetallic strip, and was fairly sure there was also a solenoid. But this added some bits to my knowledge that were missing. Great video!
@ThiagoG_ 18 днів тому
Que vídeo interessante e muitíssimo bem feito. Parabéns! Muito obrigado pelo vídeo.
@__Man__ 25 днів тому
Informative video. Really appreciate it.
@JustTim1916 25 днів тому
Really good video and well presented. Thank you
@unyu-cyberstorm64 20 днів тому
101 reason why you need a GFCI
@razsegev6415 18 днів тому
Rcd and GFCI is the same, only the scale and tripping current are different
@unyu-cyberstorm64 18 днів тому
@@razsegev6415ah yes
@unyu-cyberstorm64 18 днів тому
@@razsegev6415can they be used together?
@razsegev6415 18 днів тому
@@unyu-cyberstorm64 probably. I made the first comment because Rcd was mentioned in the video.
@unyu-cyberstorm64 18 днів тому
@@razsegev6415 They're the same thing. The point is tho, Circuit Breakers and Fuses protect property, GFCI/RCD/RCCB protect _people_ for added protection you could also install an AFCI or Arc Fault Circuit interrupter. They protect from Arc Faults.
@kobusdowney5291 21 день тому
Interesting Video, well explained. Here in South Africa we always wire incoming power to the top of the breaker, while outgoing is from the bottom. That way it is easier to not mistakenly touch live wires, since top is always live while bottom is isolated when a breaker is off.
@divoc6015 22 дні тому
That is a perfect explanation keep it up!
@HabboBoembery 25 днів тому
Nice video bro, appreciate the content
@EngineeringMindset 25 днів тому
Thank you
@keitho77 23 дні тому
Brilliant explanation of MCB's and their inner workings
@paulswearingen4395 21 день тому
Great explanation and demonstration of the operation of a thermal magnetic breaker. However, I think it’s worth mentioning that circuit breakers do protect persons from electric shock - with proper grounding and bonding practices. The most likely scenario for a person to come into contact with an energized conductor is if said conductor has inadvertently touched a conductive casing that is not meant to be energized. When a person touches that casing their body is the current path for the fault (for any electrical system that uses earth as neutral). As you pointed out, fault current through a human body may be too low to trip the breaker and you end up being an unwilling conductor for much too long. To solve this issue, electrical systems are required to be properly grounded and bonded. This means that when metal casings (or other non current carrying conductors) are bonded to a conductive grounding system and become energized, the fault will now travel with low resistance through the grounding system, produce high current, and trip the associated breaker; thus preventing an electric shock. I really appreciate your content and just want to add some clarity to your title.
@MaxPowerElectric 17 днів тому
A good point that I was going to mention as well. Grounding/bonding is obviously very widely misunderstood topic. As an apprentice electrician I even hear many of my instructors repeat the claim that "OCPDs prevent fires, GFCIs prevent shocks" which is true of course, but it fails to capture the purpose of bonding all metal parts in or near electrical systems together--the short circuit protection offered by fuses and breakers also serves the dual purpose of quickly removing hazardous voltages between exposed conductive surfaces during fault conditions, limiting the duration of a possible shock and the potential for serious injury--again illustrated by the time-current curves for these devices
@Tramm454 20 днів тому
Nice video, with closeup to details.
@Seijakukun 18 днів тому
so glad I spent (less than) 20 minutes watching this video. everything electricity related is not so widely know where I live, so I appreciate every piece of knowledge I can grasp!!
@winlose3073 24 дні тому
Hi Paul this is very nice and informative post thanks!
@amrkoptan4041 7 днів тому
exceptional !! very thorough explanation!
@edgarstevenmatira5256 20 днів тому
Absolutely phenomenal video. Thank you very much
@muthuramanchinnadurai8260 22 дні тому
Thank you very much for the video - Loved it😊
@CptAlucard 21 день тому
Amazing explanation, great video!
@wtfucrazy 24 дні тому
nice video (like always). keep up the excellent work
@s.stefan6257 16 днів тому
Great video, you make the world a better place, providing such essential information tp all of us
@Srinathji_Das 18 днів тому
Wow! This was a real treat! Thank you so very much!
@francknos 24 дні тому
So instructive ! THANKS !
@Thoran666 19 днів тому
Awesome video. I never fully understood how breakers work, now I do. I wish there was a German bubbed version so I could share this with more friends.
@aseandersen1791 25 днів тому
I am becoming an electrician now and you have helped me to understand electrical consepts. Thank you!
@EngineeringMindset 25 днів тому
Glad to help!
@Curios_Caco 13 днів тому
This was an amazing video, great job sir
@gabrijelcoh 25 днів тому
great video dude, keep making these!
@EngineeringMindset 25 днів тому
Thanks, will do!
@mrskulf 21 день тому
This video was awesome, nice job.
@morsikpl 21 день тому
What a great video! Since I wanna build house, it's great to know how those work. Sure I'll still hire real electrician, but it's still important to understand why those trips and how they really work. Thanks!
@MEGAMIGA 24 дні тому
Concise, precise and informative!
@EngineeringMindset 24 дні тому
Glad you think so!
@Infiniteknowledgenikhilrathod 19 днів тому
Very great & detail explanation 👌
@elye3701 21 день тому
Very well done. Thank you.
@gregwelch6658 20 днів тому
Excellent video!! Very well done!
@Supep007 19 днів тому
Awesome explanation and visuals. Now it makes me wonder why residential systems in my country only use C-type MCBs as the norm.
@Thevadassen 21 день тому
Amazing. Love it Mate!
@xamanto 19 днів тому
Very informative, thank you!
@ojeantas5180 День тому
im gonna call you Mr. Bugs for making this rabbit hole easy to understand. i enjoyed every minute of your video
@s0012823 21 день тому
Great video thnx! Learned a lot!
@themightybeast4716 20 днів тому
bro since I was a kid I always wondered how they work and what they meant like I been into this question for very long years and now thanks to you I know exactly how they work and what the rating are for. you would be surprised of how even the sellers in my county have no idea what they are for like they would ask you the AMPS and if you say 35 then boom here you go. nothing else no explanation of the ABC and stuff they would just tell you its the same. This Video helped a Lot and means a lot to me thanks so much for the easy but very detailed explanation. Sending Big Hugs :)
@sciencespectrum3855 22 дні тому
Amazing explanation 🎉
@Stelios.Posantzis 23 дні тому
This is a great explanation of the inner workings of a circuit breaker. Excellent work! There are, however, still questions left unanswered, mainly: a) at 11:40: Why does the piston always move downwards even if the current may be passing through the coil in either direction? There is no diode element in the circuit breaker. b) at 12:54: Why does the electric arc move from the narrower gap section to the wider gap section? Surely, the arc is easier to maintain when the gap between two electrodes is shorter. c) at 12:49: Why is the double copper electrode needed? Is the metal vaporized by the arc temperature or is the double thickness needed to better dissipate the heat generated by the arc?
@Kavyatej 21 день тому
the explanation to all of them are short, you can look them up!, but if he included it in the vid, it would have gotten a bit too "beginnery" or long
@e5Group 25 днів тому
Fully appreciate this excellent video
@geraldgomes 22 дні тому
This is the most informative video I have found on the topic. Everything is clearly explained and the animations help with understanding the explanation. Great video!
@teup010 9 днів тому
Super interesting. Thank you very much. 👍🤗
@simey6327 21 день тому
Around 1.30min: I believe the inner (red / blue in video) covering is the electrical insulation but the outer grey is the sheath and is there for mechanical protection. Not taking anything away from the video which was fantastic.
@JoeJoe-sw6zy 19 днів тому
Thank you host for sharing your work experience, I hope there will be a translation of traditional Chinese, thank you for sharing.👍🙏🙏
@wshcsafety28 23 дні тому
this video come out just the right timing for my exam . Great work 🥳
@calvinloh_ls 21 день тому
Thanks for this great video! Could you please explain why do we need to consider a 80% coefficient when designing a electrical circuit with these MCBs? For example, if a MCB is rated at 10A and the actual connected load of to the MCB is designed to be not more than 8A for a 24x7 load. Is it to consider the fact that constant high current load may cause the bimetallic strip to heat up and if let it running for long hours, it will expand and eventually cause the MCB to trip? And also, why must it be 80% and not 70% or 90%? Is there any standard for this?
@electroumit 22 дні тому
Perfect video. Thanks.
@millax-ev6yz 19 днів тому
If you were here, I would shake your hand, take you to your favorite pub, and buy you as many pints as you want. This video is exceptional! I've used these breakers so many times and this was an amazing demonstration and explanation. You are beyond incredible! I love your channel!
@eric-id6bk 20 днів тому
Awesome breakdown, earned a sub ❤
@reahs4815 21 день тому
In what country can you use 1.5mm^2 with a 20Amp braker? in Sweden its either max 10 or a 13Amp breaker if the conditions for the cable it correct
@Shogun619 19 днів тому
This video is a masterpiece. You guys are Brilliant.
@Mandragora1st 21 день тому
Very well explained
@johnwaweru9670 19 днів тому
This really informative...❤
@Last_outkast 10 днів тому
Great video. Off topic. I'm looking to get back into electrical technician work, I got a serious work injury two weeks before I graduated with a two year in electrical technology and a two year in power and control. I should be better in about six months and I was hoping to retrain myself to be ready to work. What videos, apps , books courses, Whatever would you all suggest?
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