LEARN ELECTRICS
LEARN ELECTRICS
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WHY DOES A PLUG GET HOT – WHY WILL A 13 AMP FUSE NOT FUSE EVEN AT 20 AMPS – USING THE FUSING TABLES
Very recently, I was asked the following question about plug top fuses …
If it says 13 amps on the fuse … then why does it not fuse at 13 amps? Which is true.
So in this video from LearnElectrics we will look at this, explain the reasons for it and answer some other questions like -
Why does a 13 amp plug, or plug top as we call them, overheat?
And a popular question, can a 13 amp fuse REALLY carry 20 amps
And we will also look at the fusing characteristics of a BS1362 fuse and explain how the fusing tables work and how we can quickly and easily interpret the information that they hold. Hopefully, things will be a lot clearer afterwards and a little more knowledge will have been stored in your mental toolbox.
If we can understand the fusing curves of a BS1362 plug top fuse, as shown in this particular video, then we will also understand how the fusing tables work for other fuse types.
Each fuse type will have its own unique requirements, how much current, how much time etc. as defined by the relevant design standards for that fuse. They are all different but have many similarities in how they are laid out and in how to interpret them.
This is video number 248 and to view all our videos type in LearnElectrics all one word into the CZcams search bar.
Visit our CZcams channel where we have many more videos on a wide range of electrical topics.
zhlédnutí: 1 900

Video

BS7671 TABLES AND FIGURES - UNDERSTAND HOW TO USE THE TABLES - HOW THEY WORK - IMPROVE EXAM RESULTS
zhlédnutí 1,5KPřed 14 dny
In this video from LearnElectrics we will look at the Tables section at the back of the Wiring Regulations book. We will be referring to the brown Amendment 2 book for page numbers etc. We have often been asked about the Tables and their relevance to the book, to work and to exams. Questions like … How do we use Table of Figures? What is Table of Tables at the back of the book? Will I get exam ...
CHANGING FORMULAS - HOW TO TRANSPOSE ELECTRICAL FORMULAS - EASY AND SIMPLE METHODS FOR ALL EQUATIONS
zhlédnutí 1,5KPřed měsícem
This video from LearnElectrics follows on from a previous video on transposition of electrical formulas. It covers the basics of rearranging, or transposing any formula or equation, not just electrical formulas. It will be useful to anyone learning how to manipulate mathematical problems, especially in readiness for exams and assessments. Its come about because several people have asked for a v...
AMENDMENT 3 - BS7671 - WIRING REGULATIONS - CHANGES AND HOW THEY AFFECT THE 18th EDITION EXAM & MORE
zhlédnutí 5KPřed měsícem
In this video from LearnElectrics we will look at a proposed change to the Wiring Regulations and consider, amongst other things, how this might affect the 18th edition exam and other aspects of your work. Amendment 3 of the Wiring Regulations will be released in the summer of 2024 and this has raised several questions regarding implementation of the amendment and the 18th edition exam, EICRs a...
BRIDGE RECTIFIERS - HOW THEY WORK - WHAT IS A DIODE - SEMI-CONDUCTORS - CONVERT AC VOLTAGES INTO DC
zhlédnutí 1,4KPřed 2 měsíci
In this video from LearnElectrics we will take a simplified look at five volt power supplies and at the semiconductor diodes, rectifiers, and other devices that make up the module. In today’s electronic households, small power supplies are becoming more and more common. So how do they work? Many questions have been asked - including … How do bridge rectifiers work? What is a diode and how does ...
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zhlédnutí 2,4KPřed 2 měsíci
In this LearnElectrics video we look at Ohm’s law, one of the fundamental rules for electricians. So many things in the electrical world will work in accordance with ohms law, this very simple and easy to use calculation; yet many new starters can have difficulty at first, grasping what is happening in the circuit. But understand ohms law, follow this very simple video, and you will have master...
VOLTAGE DROP AND CABLE RESISTANCE EXAM PRACTICE - PRACTICE QUESTIONS AND FULLY WORKED ANSWERS
zhlédnutí 4KPřed 2 měsíci
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TWO WAY LIGHTING TESTS - WHY DO WE TEST - WHICH WIRES ARE UNDER TEST - WHAT DO WE TEST AND WHY
zhlédnutí 2,3KPřed 3 měsíci
In this LearnElectrics video, we will look at the two-way lighting circuit tests that we must make. The video is about why we do the tests a certain way and what the tests tell us about the circuit. We’ve often been asked why there is a certain order to the testing, and why we make those particular tests. And another frequent question is about which wires, which conductors, are actually being t...
18th EDITION EXAM - QUESTION ORDER - PART ORDER - TIPS & QUESTIONS TO IMPROVE YOUR EXAM SCORE
zhlédnutí 3,3KPřed 3 měsíci
We’ve had lots of requests for information about the question order in the 18th edition Exam, and other exam related things, such as finding where to look in the book for an answer. So, in this this LearnElectrics video we will look at the question order and the Part order that is generally applied, we will tell you how many questions to expect on each Part of the book and offer tips on searchi...
2391 INSPECTION & TEST QUESTIONS AND ANSWERS FOR EXAMS AND ASSESSMENTS - WITH FULLY WORKED ANSWERS
zhlédnutí 7KPřed 3 měsíci
This LearnElectrics video is to help those of you that are taking Inspection and Test exams or assessments and want a little more practice before the day. Aimed at the 2391 style of question, it will, of course, also help those taking other electrical exams, as all learning is good learning. Or you may just want to add a little more knowledge to your mental toolbox, most of us do. There are 8 f...
MY FUSE SIZE IS NOT LISTED IN THE REGS BOOKS - HOW CAN I FIND ZS FOR THE CIRCUITS I AM WORKING ON?
zhlédnutí 1,9KPřed 4 měsíci
In this LearnElectrics video we look at how to find a Zs value or Earth Fault Loop Impedance, when the fuse size that you need, for the disconnection time that you need, is not shown in the Regulations book. And in this video, we will make reference to Amendment 2 of the Wiring Regulations, the brown book. A question that is often asked on social media states that the fuse size for which a Zs i...
VOLTAGE CHECKS - SAFE ISOLATION - SINGLE PHASE - THREE PHASE - REVERSE POLARITY - HOW - WHERE - WHAT
zhlédnutí 2,7KPřed 4 měsíci
There have been many questions on social media about safe isolation tests with specific questions about the voltages to be expected, and the differences between them when testing single phase and three phase boards for safe isolation and before starting work. And another frequent question concerns reverse polarity - what will reverse polarity voltages look like when the switch is on and what wi...
MINOR WORKS CERTIFICATE - WHEN TO ISSUE A MINOR ELECTRICAL INSTALLATION WORKS CERTIFICATE or MEIWC
zhlédnutí 2,7KPřed 4 měsíci
There have been lots of enquiries about Minor Works Certificates for electrical work that is carried out in people’s homes. Not just from electricians. Some enquiries have come from concerned home-owners who say they have received no paperwork at all from the tradesman. Is this correct, they ask. So, in this short video we will look at when we should issue a certificate, what for, and why - as ...
IP CODES IN ELECTRICAL EXAMS - 18th Edition - 2382 - 2391 - PREPARATION & HELP - QUESTIONS & ANSWERS
zhlédnutí 3KPřed 4 měsíci
This video from LearnElectrics is about helping you to understand IP codes better, either for exam or assessment preparation, for inspecting on site, or just to make your knowledge of this topic better. We show you where to find the IP Codes in the books and give you guidance on what you should be looking for with guided questions and answers. Frequently asked questions have included things lik...
KINETIC SWITCHES - HOW DO THEY WORK - NO WIRES BETWEEN SWITCHES, HOW DO THEY DO IT - WHAT IS KINETIC
zhlédnutí 3,5KPřed 5 měsíci
In this short LearnElectrics video we will take a look at how kinetic switches work. Many people have asked how kinetic switches can function when there are no wires between two-way switches. Why do we not need a neutral, how can I extend a lighting circuit with kinetic switches and a myriad of other questions. This video will take a general look at how they work, a look at how they do what the...
THE 80% RULE - Zs MEASURED - Zs TABULATED - WHAT IS THE DIFFERENCE? - WHICH ONE TO USE WHEN AND WHY
zhlédnutí 4KPřed 5 měsíci
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EXTENDING RADIAL CIRCUITS - ADDING LIGHTS TO SOCKET CIRCUITS - HOW MANY SOCKETS? - BREAKER? - CABLE?
zhlédnutí 8KPřed 6 měsíci
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18th EDITION - AMENDMENT 2 - EXAM HELP - TABLE OF TABLES - QUESTIONS AND ANSWERS - BETTER RESULTS
zhlédnutí 2,7KPřed 6 měsíci
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zhlédnutí 9KPřed 6 měsíci
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zhlédnutí 3,7KPřed 6 měsíci
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zhlédnutí 6KPřed 7 měsíci
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zhlédnutí 8KPřed 7 měsíci
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zhlédnutí 3,4KPřed 7 měsíci
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zhlédnutí 9KPřed 7 měsíci
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zhlédnutí 5KPřed 8 měsíci
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zhlédnutí 3,1KPřed 8 měsíci
TRANSFORMER CALCULATIONS - HOW TO MAKE ELECTRICAL CALCULATIONS - INPUT AND OUTPUT VOLTAGES AND WATTS
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zhlédnutí 7KPřed 8 měsíci
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VOLTAGE DROP CALCULATIONS IN 3 PHASE INSTALLATIONS AND SINGLE PHASE CIRCUITS FROM A 3 PHASE SUPPLY
zhlédnutí 8KPřed 8 měsíci
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zhlédnutí 12KPřed 9 měsíci
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zhlédnutí 9KPřed 9 měsíci
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Komentáře

  • @TukundaneTomson
    @TukundaneTomson Před dnem

    Excellent explanation, thanks 👍

  • @lukegladwin7203
    @lukegladwin7203 Před dnem

    Just passed my re sit for this exam, these videos were a life saver

  • @train4905
    @train4905 Před dnem

    Awsome😊😊

  • @tariqazeem237
    @tariqazeem237 Před dnem

    The 3 pin plug at 14 min has the blue wire connected to the fuse?

  • @iqbalnuthoo1566
    @iqbalnuthoo1566 Před dnem

    Well as usual you are amazing. They do not teach this stuff, all your videos are so educational.. Thank you!

  • @AngelaPeters-fy1tc
    @AngelaPeters-fy1tc Před 2 dny

    WOW! such a well explained simple to understand video. I had trouble knowing exactly what inrush currents were and also examples. Its not that I didnt know as the name is self explanetary as in inrush ie higher than normal but you just hammer it home into my cerebellum with your drawings and explanations. Keep up the excellent work Dave, Im determined to learn this trade by hook or by crook.

  • @davidpatterson1574
    @davidpatterson1574 Před 2 dny

    Great little video Dave-

  • @jamesgriffiths3265
    @jamesgriffiths3265 Před 2 dny

    Thank you for this: I have my assessment this week which will include either a 2P or 3P 2/W lighting circuit - this was exactly what I needed 🙏

  • @lylewatts6370
    @lylewatts6370 Před 2 dny

    An other good video with need to know info. But is there other sizes of fuses available for smaller appliances. Thanks for sharing.

  • @azadsmail8
    @azadsmail8 Před 2 dny

    Another amazing video well done, could you please have a look at plug picture ?

  • @markdilley3918
    @markdilley3918 Před 2 dny

    Odd one here, 3 core and earth on bathroom fan. After fan isolator, switched live only giving 130v, perm live happily giving 230v. Any ideas? Neutral fault???

  • @gbelectricks
    @gbelectricks Před 2 dny

    Great video as ever Dave. Why do manufacturers and British Standards design these fusing factors into their overload devices? Why can’t a fuse with an “In” of 13A operate at 13A of current? Or an MCB with an “In” of 32A operate at 32A?

  • @Aadaammmmm
    @Aadaammmmm Před 2 dny

    Hi Dave. Preparing for my 2391 these videos are a gold mine. For some reason Ive always believed the minimum trip time for an rcbo was <200ms was this changed recently? Cheers.

  • @dastanaiub4607
    @dastanaiub4607 Před 2 dny

    may you add another vedio about how to find a .short circuit or wire, in a house

  • @danielteyehuago1633

    I'm here again.

  • @Ibrahim-vt2tz
    @Ibrahim-vt2tz Před 3 dny

    Thank you ❤

  • @persian_warrior1
    @persian_warrior1 Před 3 dny

    Thank you

  • @olly7673
    @olly7673 Před 3 dny

    It's amazing how many experienced sparks don't even understand the concept of Fusing factors and tables. For example, how many times do we see immersion heaters fed from a 13A FCU instead of a 20A DP switch? Thanks for the usual, clear way of sharing your knowledge 👏

    • @MikeSmith-tx2lp
      @MikeSmith-tx2lp Před dnem

      If the cable from the switch to the immersion is suitably rated, then why is it a problem? Immersion elements are 3000w drawing 12.5 A for about an hour per full tank reheat. 1.5mm heat resistant flex has a rating of 16A, I would use 2.5mm which is 24A. The whole circuit should be on a 16A MCB/RCBO. I would argue either method of isolation is satisfactory, but every day is a school day?

    • @olly7673
      @olly7673 Před dnem

      @@MikeSmith-tx2lp interesting to see you choose 2.5mm over 1.5mm even though 1.5mm is rated at 16A and well above the 12.5-13A the element can draw. I agree with your choice and for me, it is because of the time the cable and switch will be drawing that current for 2 hours or thereabouts for an average 117L tank, rather than the hour you suggest, and doing that cycling regularly will and does eventually deteriorate the plastic of the FCU. Also, as you point out the regs stipulate it should be on its own circuit anyway, so does it need a 13A BS1362 after your OCPD in the board? I don't think so. And yes, every day is a school day for me as well.

    • @MikeSmith-tx2lp
      @MikeSmith-tx2lp Před 23 hodinami

      @@olly7673 Nice discussion, how it should be. Made me think a bit more and I’m now going to replace a couple that I have put on FCUs with the 20A DP switch. Why else would they make one !? I have seen the heat damage on older installations, it’s real. I prefer the 2.5mm flex just for the safety margin but it’s probably overkill as the load won’t draw more than 13A and the 16A mcb will instantly trip on a live fault and the RCD/RCBO will catch the other more likely faults. Same argument for purpose built immersion timers, they need to be rated for the duty cycle. Now shall we discuss the cooker diversity chestnut ?👍😎

  • @ivanbuckingham2302
    @ivanbuckingham2302 Před 3 dny

    I'm just about to finish Level 3 after 2 years of study and here I am learning valuable information about a plug top from CZcams. Thank you.

  • @johnshiels842
    @johnshiels842 Před 3 dny

    Yet another of your brilliant videos David

  • @dimitrisblane6368
    @dimitrisblane6368 Před 3 dny

    Thank you! Is the plug in the end of the video miswired on purpose?

  • @rjfxr
    @rjfxr Před 3 dny

    Can't get better than this. Thanks for sharing

  • @excuthiesboy
    @excuthiesboy Před 3 dny

    Thank you again - Very clear presentation - Every domestic user should know this

  • @danielteyehuago1633

    Wow! This video is very informative and the best video tutorial on the topic for me so far. I really appreciate it. Thanks for sharing it with us Dave

  • @danielteyehuago1633

    I'm here again thanks for sharing this with us

  • @khalidacosta7133
    @khalidacosta7133 Před 4 dny

    There's an easy way to safeguard a ring circuit... each leg should be in it's own 16a breaker.... maybe even 20a to account for the resistance. Surprised this isn't done more often?

  • @rizgar8121
    @rizgar8121 Před 4 dny

    🙏

  • @SamJ26.
    @SamJ26. Před 5 dny

    Thanks for the videos

  • @gavowassy7655
    @gavowassy7655 Před 5 dny

    What's the bonding in the hot press called?

  • @simbamuseka4028
    @simbamuseka4028 Před 7 dny

    Got my exam in 8 days and I just stumbled on this Gold Dust will tell you how it goes Thanks so so much for these Great Videos they are such a great help 🙏🙏🙏

  • @SamJ26.
    @SamJ26. Před 8 dny

    Excellent video, thanks

  • @user-yd2eb5ij7f
    @user-yd2eb5ij7f Před 8 dny

    You videos are excellent, but 18 edition exam was the easiest exam so far for me and no revision needed because is an open book, lots of people fail from my classroom because they over complained things.

  • @AngelaPeters-fy1tc
    @AngelaPeters-fy1tc Před 8 dny

    Wow! This is simple but revolutionary teaching. Like so many others ive also struggled in getting my head around this. After watching this once its unbelievably clearer and ive been to 2 different electrical training providers in the last couple of years. Goes to show how they fly through the basics expecting you to grasp the concepts. Thankyou so much ive also taken photos on my phone to put in my file under the earthing and bonding section.

  • @cag9284
    @cag9284 Před 8 dny

    Where dose the 10 amp fuse come in😉 3000 devided by 230 equels 13.04?

  • @SamJ26.
    @SamJ26. Před 8 dny

    Thanks a lot

  • @TheZohri
    @TheZohri Před 9 dny

    I wish I had you as my tutor for the whole course. The way you explain stuff makes it so easy to understand. As such, I thank you a million times over.

  • @JD-ts1lz
    @JD-ts1lz Před 9 dny

    Most confusing video I’ve seen in my life mate

  • @JShamaal
    @JShamaal Před 10 dny

    Hi, Please create Playlists and put relevant videos in each playlist to organise your videos in their relavent groups. This increases viewabilty and helps your viewers to navigate easily to the videos of their choice. Thanks Yambagak

  • @krazylad84
    @krazylad84 Před 11 dny

    Thanks alot for sharing. Did you make a video on how many circuits to make in residential and the factors we should take into consideration when deciding on making circuits during rewiring etc? great help thanks again

  • @danielteyehuago1633
    @danielteyehuago1633 Před 11 dny

    1:02 Please can you use IR tester for continuity test, if yes how is it done.

  • @simplymiswak4010
    @simplymiswak4010 Před 11 dny

    I am a college student studying electrical diploma and without these videos I would have missed out on a ton of knowledge. I have began studying every single video of yours from the oldest one making my way to the newest video. So far I’m at the video called diversity and maximum demand which was uploaded 3 years ago as of today. Please carry on making videos I have benefitted greatly and I would like to inform you that your efforts are definitely not going to waste because at least I am here literally studying every single one of your videos I mean literally every single one. Thanks!

  • @mohammedborhan9677
    @mohammedborhan9677 Před 11 dny

    Hi, can you please send me the formula for voltage drop for socket three phase For single phase is 11,5 What is the formula for three phase Thank you

  • @CADstruction
    @CADstruction Před 12 dny

    Good to know about the 1.5mm cable off a spur

  • @STohme
    @STohme Před 12 dny

    Excellent presentation of the topic for non expert in this area. Many thanks.

  • @Fixtri
    @Fixtri Před 12 dny

    Please I need help with part 4-5

  • @solariscity
    @solariscity Před 13 dny

    If I pass 18th edition +P+Test can I issue a Minor Electrical Certificate?

    • @user-yd2eb5ij7f
      @user-yd2eb5ij7f Před 8 dny

      Yes mate, even your grandma can do that ... You need 0 qualifications only need to be competent of undertaking electrical work and obviously know how to write one

  • @jamiemarks1944
    @jamiemarks1944 Před 13 dny

    Please can u do fault finding on lighting circuit for am2

  • @jamiemarks1944
    @jamiemarks1944 Před 13 dny

    Can u please do a fault finding on lighting circuit please

  • @Bestofthebest383
    @Bestofthebest383 Před 13 dny

    Amazing . Perfect explanation as always. Thanks for your time Sir

  • @mohammadshirifeshki4018

    Thank you Dave. May I have your email address please.