Why Circuit Breakers DON'T Protect People (electric shocks)
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- Опубликовано: 14 апр 2024
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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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how many times did you zap yourself
Yeah it true
The video literally stated just that, right from very start.
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! ❤ & 🖖
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)
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
It took a while to make, but I hope you enjoy the video
@@EngineeringMindset Not every hero wears a cape
great stuff takes time.
@@2Pzp Engineering heroes wear shirts, ties, jeans and tennis shoes :)
This is a gold standard for showing how breakers work. Very pleased with that
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.
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?
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.
I don't know where these electricians came from. But any certified electrical technician should know something as basic as how electrical protections work.
@@bladeoflucatielno, he shouldn't - his presentation is fine the way it is !
your country specs statement is wrong.
I'm loving this more live-action kind of videos
Glad to hear, will be doing more of them where possible
@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
I concur
This is about the best video explaining how a MCB works. Well done.
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.
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.
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
I've seen misleading titles in my time and this is NOT the hill to die on
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
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.
@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
I was just wondering why arc moves upward, thank you
Also the resulting magnetic field moves the arc away.
Seems like circuit breakers for the ISS might be bit more tricky(aside from a lot of them having to work on DC voltage)
@@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
Dude, the transitions are so freaking mind boggling! Great Job Paul!
Thank you, glad you liked the hard work
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”.
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.
@@leeroyjenkins0we should call every thing that protects people: “people protector”. Helmet? People protector. Epinephrine pen? People protector!
@@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.
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
So you could say they break people.
Those circuit-breaker graphs are great! I learned a lot from this.
They are called trip curves.
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 😂😂
this is the best video i’ve seen about this topic.
Utterly brilliant description - thanks so much for taking the time to put this together!
This was easily the best video I've ever seen on this topic in my whole life. Top tier quality right here
101 reason why you need a GFCI
Rcd and GFCI is the same, only the scale and tripping current are different
@@razsegev6415ah yes
@@razsegev6415can they be used together?
@@unyu-cyberstorm64 probably. I made the first comment because Rcd was mentioned in the video.
@@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.
Its wild how much engineering and thoughts have gone into these circut breakers. Well explained, easy to digest.
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!
The clearest and simplest demonstration and explanation of how this works. Excellent work!
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
You are the only electrical engineer i have noticed explaining the breaker selection chart clearly and neatly....do more videos brother keep it up....
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!
incredible detail. above and beyond all other explanations. fantastic work.
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 😊
A clear, concise explanation of these magical devices. Awesome, & many thanks for your work. 👍
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)).
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.
@@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.
"C" - type MCBs are most UNcommon in domestic installations.
@@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.
The best class about circuit breakers I'd seen!!
Congratulations for the content!
Explained so well, Will save this for future teaching of remedials.
This video has one of the best animations I have ever seen in an engineering video, good job! 👏
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!
This is a really well produced video! Great job!
Best Video I have seen in a while, so good explained and detailed :)
This is amazing!! The depth and simplicity of the explanation is just brilliant!!
.org
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!
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.
100mA is potentially enough to stop your heart. It also depends on the voltage
This explanation is so good!! Definitely need more of these videos, from RCD to medium voltage devices
Great visual explanation of Circut breaker parts and operation. Liked! 🙂
Wow! This was a real treat!
Thank you so very much!
i just stumbled across this channel and i LOVE it! this really helps with understanding things like this. ive always wondered about. thank you!
Awesome video! I have never seen a video by you before, but I am glad I did. Keep up the good work 👍🏻
(I subscribed)
Excellent video! Thanks for creating such a high quality video on circuit breakers. Learning becomes so easy with visualization of the operation.
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!!
Brilliant explanation of MCB's and their inner workings
Incredibly informative video, best video for explaining the MCB function, you are great man... ❤❤
Phenomenal work. Thank you very much !
What a fantastically clear and detailed explanation of an everyday item. Thanks
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.
exceptional !! very thorough explanation!
This must be the best video available explaining breakers.
Great video, you make the world a better place, providing such essential information tp all of us
This was an amazing video, great job sir
im gonna call you Mr. Bugs for making this rabbit hole easy to understand. i enjoyed every minute of your video
Nice video, with closeup to details.
I think this video should be archived for students to learn. Really great presentation. ❤❤🎉🎉
Great video. I like your animation and cross-section efect. It realy help to understand.
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.
Good point, If the video is popular I can follow up with some additional info.
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.
Very great & detail explanation 👌
Very informative, thank you!
I really love your videos. you made me more attached to the electrical concepts. thank you so much with much respect.😍😍
Glad you like them!
I'm new on this channel, I'm amazed how high quality this video was! Kudos!
This video is a masterpiece.
You guys are Brilliant.
thanks a lot. your videos can save million of lives.
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.
That is a perfect explanation keep it up!
Absolutely phenomenal video. Thank you very much
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.
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
As always loved your videos ❤ and please make videos on other types of transistors and their uses❤❤
Thank you very much for the video - Loved it😊
Que vídeo interessante e muitíssimo bem feito. Parabéns!
Muito obrigado pelo vídeo.
I learned something new today! Thanks
Really good video and well presented. Thank you
Amazing explanation, great video!
Very clear description and video with no Unnecessary BS.
Awesome breakdown, earned a sub ❤
Hi Paul this is very nice and informative post thanks!
This video was awesome, nice job.
this video come out just the right timing for my exam . Great work 🥳
nice video (like always). keep up the excellent work
Awesome explanation and visuals. Now it makes me wonder why residential systems in my country only use C-type MCBs as the norm.
What an amazingly informative video
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 🙏☺️
Glad to help!
Electricity confuses me so much and I'm trying to learn what I can from time to time and I had been wondering how circuit breakers work. This was very very informative and interesting. Thank you :)
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!
Best video explaining breakers
I am becoming an electrician now and you have helped me to understand electrical consepts. Thank you!
Glad to help!
Super interesting. Thank you very much. 👍🤗
Amazing video! Thank you so much
This really informative...❤
Informative video. Really appreciate it.
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.
Amazing. Love it Mate!
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 :)
very good explaining video , please make for more information about RCD breakers
Thank you host for sharing your work experience, I hope there will be a translation of traditional Chinese, thank you for sharing.👍🙏🙏
So instructive ! THANKS !
Nice video bro, appreciate the content
Thank you
Excellent video!! Very well done!
I think their reliability is really an interesting thing. So many different stages are connected just through contact but it still works so reliable.
Yeah pretty much, one of the first things I learned in my apprenticeship. Good video