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How to Calculate the cable size and protective device rating

JPElectric
2021 ж. 31 Нау.
34 013 Рет қаралды
Жүктеу

Electrical Installation Design
How to carry out cable calculations to correctly size your electrical conductors
Design Current
Protective devices
Current carrying capacity
Volt drop
Sizing of the MCB/Fuse
and more...
At 21.29 you might spot I used the In instead of Ib in the volt drop calculation. So 16A instead of 13.04 A
Volt drop is actually 13.23v not 16.24v
Still unsuitable cable though
22.16 Maths error Ib x L

Пікірлер

  • One of the best instructional video's I've watched,wish this could of been around 35+ years ago!!

    @nickgilbert3895@nickgilbert38957 күн бұрын

    • Thank you Nick for the nice comment

      @JPElectric@JPElectric10 сағат бұрын

  • This is excellent work you've done here. Much appreciated.

    @OulChap@OulChap3 күн бұрын

    • Thanks for watching OulChap

      @JPElectric@JPElectric10 сағат бұрын

  • Absolutely wonderful. As an adult learner I have watched many videos and read a lot about how to calculate cable size. The way you've explained it here (particularly the graphics) is the best I've seen and I'd recommend it to all apprentice electricians. Thanks for taking the time and I look forward to your future videos.

    @no_short_circuit@no_short_circuit3 жыл бұрын

    • Thanks very much for your comment. Really pleased you are finding these videos useful.

      @JPElectric@JPElectric3 жыл бұрын

    • Your videos are absolutely informative, better than most

      @tz1564@tz15643 жыл бұрын

    • @@JPElectricAs a student, many times I was faced with the task of making presentations. I hated it. However, I have come to appreciate what was being conveyed through this aspect of the assignments. It seems you are a master at it.

      @thesparksplug@thesparksplug3 ай бұрын

  • 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.

    @danielteyehuago1633@danielteyehuago16332 ай бұрын

  • superb video for apprentices and sparks alike. golden material for apprentices doing the design assignment for the city and guilds 5357 qualification

    @AvoElectrical@AvoElectricalАй бұрын

  • Awesome. Really go through the nuts and bolts of things in all your presentations

    @dannymort7262@dannymort7262 Жыл бұрын

    • Thanks very much Danny

      @JPElectric@JPElectric Жыл бұрын

  • That's a wonderful video, well done. One point, at the time 48:15, Ib=13.04 needs to be used instead of In=16, then correct Vd is 13.23v

    @balsamomahmoudian3279@balsamomahmoudian3279Ай бұрын

  • The way you explained each and everything is simply amazing..

    @ZeeshanMuhammad-xo5kw@ZeeshanMuhammad-xo5kw2 ай бұрын

    • Thanks very much appreciate it.

      @JPElectric@JPElectric2 ай бұрын

  • Thank you very much. Such a great and clear presentation. Everything makes sense!

    @dimitrisblane6368@dimitrisblane63685 ай бұрын

  • Wow! This is very informative. Your video on this topic is top notch

    @danielteyehuago1633@danielteyehuago16336 ай бұрын

  • Nice instruction. Best I've seen. Thanks for your hard work.

    @pin7706@pin77062 жыл бұрын

    • Wow, thanks!

      @JPElectric@JPElectric2 жыл бұрын

  • This is a top notch video

    @danielteyehuago1633@danielteyehuago163325 күн бұрын

  • your're the best. that's it! thanks a million for your hard work to make this amazing tutorial. This was exactly what I was looking for.

    @behdokhtekr5242@behdokhtekr52422 жыл бұрын

    • Thank you, for the kind comment

      @JPElectric@JPElectric2 жыл бұрын

  • Your vids are really good thank you.

    @angelofranklin1@angelofranklin17 ай бұрын

  • Mate your content is incredible you deserve more subscribers. And with those illustrations - pure class you should write a book. Gonna throw link around various others see what happens, it may help. Much much appreciated, Steve sparks.

    @steveokinevo@steveokinevo3 жыл бұрын

    • Thanks SteveO KinevO, Really appreciate your kind comment, and suggesting my site to other you tubers.

      @JPElectric@JPElectric3 жыл бұрын

  • Absolutely brilliant video!

    @mikekingswood@mikekingswood Жыл бұрын

    • Thanks Mike Appreciate it.

      @JPElectric@JPElectric Жыл бұрын

  • What a fantastic video brilliant keep up the great work

    @markadams3746@markadams3746 Жыл бұрын

    • Thanks Mark appreciate it.

      @JPElectric@JPElectric Жыл бұрын

  • Please can you come with a video on this question; Two lamps are connected in series lamp A is rated 60W and lamp B is rated 100W. Which of this lamp will glow brighter if the supply voltage is 230V and why... Again Which of this lamp will glow brighter if it is connected in parallel with 230V and why...

    @danielteyehuago1633@danielteyehuago16332 ай бұрын

  • 26:43 Shouldn't the current for the orange line be the sum of both current so the voltage drop across orange line should be calculated with 16A?

    @user-lb8mc9do8f@user-lb8mc9do8f9 ай бұрын

  • Great video I could not understand the section 433 (iii) after watching your video I understood it thank you very much and please keep on making these wonderful videos it’s helped me and It will help many more God bless you 👍👍👍👍

    @emihaji3666@emihaji36662 жыл бұрын

    • Hi Emi Haji, Thanks for watching. pleased it helped you.

      @JPElectric@JPElectric2 жыл бұрын

  • Simply great! - thanks.

    @marcushall8432@marcushall84322 жыл бұрын

    • Thank you Marcus

      @JPElectric@JPElectric2 жыл бұрын

  • Excellent guide. Thank you.

    @paulord603@paulord603 Жыл бұрын

    • Thank you Paul

      @JPElectric@JPElectric Жыл бұрын

  • This was your best yet. Best Domestic electrics tutorials on KZhead.Took me a few days to get through it all. Your two previous comments below sum it all up.Adult Learner Question:@45:50 you mention table 4D2A and/or 4D5(flat twin and earth) and @46:00 similarly you refer to 4d2B and 4D5 .Can you use both tables interchangeably?Why no Reference B in 4D5 .I am not too sure what type of cable 4D2A refers to in a domestic situation.Thank you for this video.

    @freezefoot@freezefoot3 жыл бұрын

    • Thanks Freeze foot. Well done for getting through the whole video. I do think they might be a bit too long? Table 4D5 is specifically for T&E in insulated stud walls, and above plasterboard ceilings, covered in insulation. So its for a very specific type of installation method. The other table 4D2A Is for PVC/PVC insulated cable (Inner and outer insulation) so that would include twin and earth as well. This table gives you a few more installation methods to choose from. You will notice the volt drop is the same in 4D5 and 4D2B

      @JPElectric@JPElectric3 жыл бұрын

    • I appreciate your reply and clarification.The length of the video may put others off but there was detail in this video that I had not seen in similar videos covering this topic so it is always a compromise.Look forward to your next video.

      @freezefoot@freezefoot3 жыл бұрын

  • Good video, I learned a lot watching it.

    @mobilelegenduk3325@mobilelegenduk33254 ай бұрын

    • Really please you found it useful, thanks for watching

      @JPElectric@JPElectric3 ай бұрын

  • Education at its finest

    @user-ki2ni5rj2w@user-ki2ni5rj2w4 ай бұрын

    • Very kind of you to say so , thank you

      @JPElectric@JPElectric3 ай бұрын

  • Please apart from this MFT instrument, which other instrument can be use to determine the resistance value of a cable for for a distance of 1m

    @danielteyehuago1633@danielteyehuago1633Ай бұрын

  • Please apart from MFT, which instrument can be use to measure the cable resistance

    @danielteyehuago1633@danielteyehuago163325 күн бұрын

  • Dear Sir, I would be very grateful if you could tell me which type of MCB is suitable for each of the following home appliances: - Split air conditioner. - Fridge. Electric stove. - the oven. - microwave. - dish washer. - Washing machine. Clothes dryer. Thank you very much sincerely Khalid

    @khalidrash5814@khalidrash5814 Жыл бұрын

  • Very good explanation

    @stephencunningham8850@stephencunningham88504 ай бұрын

    • Thanks very much Stephen

      @JPElectric@JPElectric3 ай бұрын

  • Hello sir, Should the outdoor service switch be greater or smaller than the main breaker in the consumer unit? I'll be so grateful if you would send me back. Thank you, Khalid

    @khalidrash5814@khalidrash5814 Жыл бұрын

  • Fantastic video, your method of explaining things are absolutely remarkable. Is it possible to possible to do a video on testing emergency lighting please.? Much appreciated! Thanks ❤

    @linksone6287@linksone62876 ай бұрын

    • Thank you linksone6287. Thats a really nice comment and I appreciate it. Emergency lighting would be a good subject to cover.

      @JPElectric@JPElectric6 ай бұрын

  • For 27 A current carrying capacity cable (with account of correction factors) , first standard fuse rating is 25 A. Not 20 A

    @imeprezime1285@imeprezime12855 ай бұрын

  • Thanks

    @samanadam2442@samanadam2442 Жыл бұрын

  • Very comprehensive

    @highgatehandyman6479@highgatehandyman6479 Жыл бұрын

    • Thanks Highgate Handyman, appreciate you watching.

      @JPElectric@JPElectric Жыл бұрын

  • As a lecturer in Electrical Installation myself I can only agree with the sentiments expressed by others in the comments section. Your style and content is second to none . Would love the opportunity to speak with you , I’ve struggled to find any contact details.

    @MizunoIronMan@MizunoIronMan2 жыл бұрын

    • Thanks for the kind comment

      @JPElectric@JPElectric2 жыл бұрын

  • Brilliant

    @markr452@markr4522 жыл бұрын

    • Thanks Shropshire Mon

      @JPElectric@JPElectric Жыл бұрын

  • correction: time 21:21

    @balsamomahmoudian3279@balsamomahmoudian3279Ай бұрын

  • Great 👍

    @eltranjbar6837@eltranjbar683711 күн бұрын

    • Thank you

      @JPElectric@JPElectric10 күн бұрын

  • Wow You are amazing

    @farman2020@farman2020 Жыл бұрын

  • 👍👍

    @mikeadler434@mikeadler434 Жыл бұрын

    • Thanks for the thumbs up Mike, appreciate it.

      @JPElectric@JPElectric Жыл бұрын

  • 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.

    @danielteyehuago1633@danielteyehuago16336 ай бұрын
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