Why Circuit Breakers DON'T Protect People (electric shocks)

Рет қаралды 794,691

Ай бұрын

How 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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Пікірлер: 692

@EngineeringMindset Ай бұрын

*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: kzfaq.info/love/k0fGHsCEzGig-rSzkfCjMwjoin

@windowsgaming-dn9qx Ай бұрын

how many times did you zap yourself

@Win11FTW Ай бұрын

Yeah it true

@BeaulieuTodd Ай бұрын

The video literally stated just that, right from very start.

@philpeko1796 Ай бұрын

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 Ай бұрын

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 Ай бұрын

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 Ай бұрын

It took a while to make, but I hope you enjoy the video

@2Pzp Ай бұрын

@@EngineeringMindset Not every hero wears a cape

@Ryuken2721 Ай бұрын

great stuff takes time.

@tanithrosenbaum Ай бұрын

@@2Pzp Engineering heroes wear shirts, ties, jeans and tennis shoes :)

@xTerminatorAndy Ай бұрын

This is a gold standard for showing how breakers work. Very pleased with that

@TishaHayes Ай бұрын

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 Ай бұрын

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 Ай бұрын

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 Ай бұрын

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 Ай бұрын

@@bladeoflucatielno, he shouldn't - his presentation is fine the way it is ! your country specs statement is wrong.

@Andrew-pw6zu 8 күн бұрын

Don't blame the student. Blame the teacher

@somedude4805 Ай бұрын

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 Ай бұрын

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 Ай бұрын

@@leeroyjenkins0we should call every thing that protects people: “people protector”. Helmet? People protector. Epinephrine pen? People protector!

@quinnwhite8761 Ай бұрын

@@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 Ай бұрын

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 Ай бұрын

So you could say they break people.

@JoaoVictor-hz4rm Ай бұрын

I'm loving this more live-action kind of videos

@EngineeringMindset Ай бұрын

Glad to hear, will be doing more of them where possible

@JoaoVictor-hz4rm Ай бұрын

@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 Ай бұрын

I concur

@tuckkeongho Ай бұрын

This is about the best video explaining how a MCB works. Well done.

@AtAGlimpse_UB Ай бұрын

Dude, the transitions are so freaking mind boggling! Great Job Paul!

@EngineeringMindset Ай бұрын

Thank you, glad you liked the hard work

@TheEulerID Ай бұрын

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 Ай бұрын

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 Ай бұрын

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 Ай бұрын

I've seen misleading titles in my time and this is NOT the hill to die on

@S-mz2my Ай бұрын

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 Ай бұрын

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.

@jhanthony2 Ай бұрын

Those circuit-breaker graphs are great! I learned a lot from this.

@altuber99_athlete Ай бұрын

They are called trip curves.

@gg-gn3re Ай бұрын

@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 Ай бұрын

I was just wondering why arc moves upward, thank you

@thebamplayer Ай бұрын

Also the resulting magnetic field moves the arc away.

@ImieNazwiskoOK Ай бұрын

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 Ай бұрын

@@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

@Delibro 22 күн бұрын

@@ImieNazwiskoOK Thinking outside the box, no matter how relevant. I like this :D

@JackCobalt Ай бұрын

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 Ай бұрын

Utterly brilliant description - thanks so much for taking the time to put this together!

@theavchap Ай бұрын

The clearest and simplest demonstration and explanation of how this works. Excellent work!

@luispereira3 Ай бұрын

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!

@thorbjrnschnellthanner2642 Ай бұрын

Its wild how much engineering and thoughts have gone into these circut breakers. Well explained, easy to digest.

@unyu-cyberstorm64 Ай бұрын

101 reason why you need a GFCI

@razsegev6415 Ай бұрын

Rcd and GFCI is the same, only the scale and tripping current are different

@unyu-cyberstorm64 Ай бұрын

@@razsegev6415ah yes

@unyu-cyberstorm64 Ай бұрын

@@razsegev6415can they be used together?

@razsegev6415 Ай бұрын

@@unyu-cyberstorm64 probably. I made the first comment because Rcd was mentioned in the video.

@unyu-cyberstorm64 Ай бұрын

@@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.

@__u__9464 Ай бұрын

This was easily the best video I've ever seen on this topic in my whole life. Top tier quality right here

@IrisNebula7023 Ай бұрын

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 😊

@rahul2000 Ай бұрын

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 Ай бұрын

The best class about circuit breakers I'd seen!! Congratulations for the content!

@HimalayanYeti Ай бұрын

This is amazing!! The depth and simplicity of the explanation is just brilliant!!

@tedchirvasiu Ай бұрын

.org

@arjun-vh7np Ай бұрын

You are the only electrical engineer i have noticed explaining the breaker selection chart clearly and neatly....do more videos brother keep it up....

@skysurferuk Ай бұрын

A clear, concise explanation of these magical devices. Awesome, & many thanks for your work. 👍

@Ryan-cm5rm Ай бұрын

This is a really well produced video! Great job!

@pcfreak1992 Ай бұрын

This video has one of the best animations I have ever seen in an engineering video, good job! 👏

@jamesbensley7914 Ай бұрын

Explained so well, Will save this for future teaching of remedials.

@timothysands5537 Ай бұрын

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 Ай бұрын

Excellent video! Thanks for creating such a high quality video on circuit breakers. Learning becomes so easy with visualization of the operation.

@LovSven2011 Ай бұрын

Great visual explanation of Circut breaker parts and operation. Liked! 🙂

@MrDreugh Ай бұрын

Awesome video! I have never seen a video by you before, but I am glad I did. Keep up the good work 👍🏻 (I subscribed)

@Logical19 Ай бұрын

i just stumbled across this channel and i LOVE it! this really helps with understanding things like this. ive always wondered about. thank you!

@Seijakukun Ай бұрын

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!!

@AJTarnas 29 күн бұрын

incredible detail. above and beyond all other explanations. fantastic work.

@datadrivendave Ай бұрын

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!

@mathiastomixd Ай бұрын

Best Video I have seen in a while, so good explained and detailed :)

@nikolaskurnia7404 Ай бұрын

This explanation is so good!! Definitely need more of these videos, from RCD to medium voltage devices

@mirza5373 10 күн бұрын

So much engineering compacted into this tiny device! Thanks for the explanation

@kushanchathuranga2707 Ай бұрын

Incredibly informative video, best video for explaining the MCB function, you are great man... ❤❤

@jincongdai2982 15 күн бұрын

very well made! really well detailed! i learned a lot

@kerrywsmyth 20 күн бұрын

At work they call these “time delay” but now that you show exactly how they work with the graph, everything makes sense now.

@mariustv927 25 күн бұрын

I'm an electrician and pretty much knew this stuff already. But you explained it so incredibly well and entertaining that I just had to watch the whole thing. Thank you!

@ukaszk3755 Ай бұрын

Great video. I like your animation and cross-section efect. It realy help to understand.

@AlmightyPyro Ай бұрын

this is the best video i’ve seen about this topic.

@lukehall7387 4 күн бұрын

This is a fantastic video! very well explained!

@Tramm454 Ай бұрын

Nice video, with closeup to details.

@Infiniteknowledgenikhilrathod Ай бұрын

Very great & detail explanation 👌

@garza1367 10 күн бұрын

This page is remarkable, I watch all the videos. The illustrations coupled with explanation is amazing. I’m a master electrician (yes I know it’s just a title and just means I’m a good test taker) and I continue to learn.

@smarteth4342 Ай бұрын

I really love your videos. you made me more attached to the electrical concepts. thank you so much with much respect.😍😍

@EngineeringMindset Ай бұрын

Glad you like them!

@amrkoptan4041 Ай бұрын

exceptional !! very thorough explanation!

@gregwelch6658 Ай бұрын

Excellent video!! Very well done!

@robertnull Ай бұрын

I'm new on this channel, I'm amazed how high quality this video was! Kudos!

@Srinathji_Das Ай бұрын

Wow! This was a real treat! Thank you so very much!

@Curios_Caco Ай бұрын

This was an amazing video, great job sir

@Ghou1Lord 28 күн бұрын

This must be the best video available explaining breakers.

@richardcampbell4506 Ай бұрын

What a fantastically clear and detailed explanation of an everyday item. Thanks

@JustTim1916 Ай бұрын

Really good video and well presented. Thank you

@user-dp2lh1hc3z 27 күн бұрын

Phenomenal work. Thank you very much !

@CptAlucard Ай бұрын

Amazing explanation, great video!

@ChristopherVangelder Ай бұрын

I learned something new today! Thanks

@allangibson8494 Ай бұрын

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 Ай бұрын

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 Ай бұрын

@@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 Ай бұрын

"C" - type MCBs are most UNcommon in domestic installations.

@allangibson8494 Ай бұрын

@@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.

@ojeantas5180 29 күн бұрын

im gonna call you Mr. Bugs for making this rabbit hole easy to understand. i enjoyed every minute of your video

@keitho77 Ай бұрын

Brilliant explanation of MCB's and their inner workings

@Thevadassen Ай бұрын

Amazing. Love it Mate!

@curmut3772 Ай бұрын

great video! I learned a bunch

@s0012823 Ай бұрын

Great video thnx! Learned a lot!

@edgarstevenmatira5256 Ай бұрын

Absolutely phenomenal video. Thank you very much

@BJcanal270 15 күн бұрын

Thanks for sharing your knowledge

@mrskulf Ай бұрын

This video was awesome, nice job.

@InfinityFnatic Ай бұрын

Amazing video! Thank you so much

@__Man__ Ай бұрын

Informative video. Really appreciate it.

@muthuramanchinnadurai8260 Ай бұрын

Thank you very much for the video - Loved it😊

@divoc6015 Ай бұрын

That is a perfect explanation keep it up!

@techtechnicalgaming Ай бұрын

As always loved your videos ❤ and please make videos on other types of transistors and their uses❤❤

@HabboBoembery Ай бұрын

Nice video bro, appreciate the content

@EngineeringMindset Ай бұрын

Thank you

@s.stefan6257 Ай бұрын

Great video, you make the world a better place, providing such essential information tp all of us

@kobusdowney5291 Ай бұрын

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.

@Thoran666 Ай бұрын

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.

@xamanto Ай бұрын

Very informative, thank you!

@anurimapal7768 24 күн бұрын

I think this video should be archived for students to learn. Really great presentation. ❤❤🎉🎉

@francknos Ай бұрын

So instructive ! THANKS !

@elye3701 Ай бұрын

Very well done. Thank you.

@BMWKelle 20 күн бұрын

Amazing video. Thank you very much

@peterparson6151 Ай бұрын

Very clear description and video with no Unnecessary BS.

@thanhheu4129 Ай бұрын

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 Ай бұрын

Glad to help!

@wtfucrazy Ай бұрын

nice video (like always). keep up the excellent work

@teup010 Ай бұрын

Super interesting. Thank you very much. 👍🤗

@fakrulislam5404 26 күн бұрын

thanks a lot. your videos can save million of lives.

@muffinglish Ай бұрын

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.