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OVERCURRENT DIFFERENCES - OVERLOAD - SHORT CIRCUIT - EARTH FAULT - WHAT ARE THEY & HOW DO THEY WORK?
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- Опубліковано 6 сер 2024
- What is an overcurrent? What do we actually mean when we talk about overcurrents?
New starters in the trade, and even the occasional more experienced electrician, will get confused by the different terms and it is important that we use the correct terminology so that others understand just what type of fault condition we are describing. Knowing the type of fault will often help us to find the problem more quickly and more easily.
What is an overcurrent or an overload? How would you describe them, and what is the difference between a short circuit and an earth fault?
Why is it wrong to say that we have an “earth short”, or even “a short in the earth wire”?
And what do the Wiring Regulations say?
In this LearnElectrics video we will look at this topic.
To view all of our videos, type in LearnElectrics all one word into the UA-cam search bar.
This is video No.186 on our UA-cam channel where we have videos on a wide range of electrical topics.
Honestly, UA-cam can be a great platform when people like you add knowledge like this to it. Incredible how much I can learn in my journey to becoming a master electrician. Not just a sparky. Thankyou for your time and effort mate 👍
I appreciate that, great feedback, thank you. Good luck in your career, its always been good to me and taken me around the world several times on different contracts.
Thanks. This brought lot of clarity and helped me clear the doubts I had.
Glad it was helpful, thank you.
Excellent Dave. I remember before you started this channels, I had so many questions in my mind but today I need to think about if there is anything else I should ask you.
Cheers and highly appreciated your work !
Thank you, great comments. Dave.
Thank you Dave - again you give a clear explanation of important distinctions. And of course I will be writing it down in my crib book, which owes a lot to 'Learn Electrics' 👍
That's the important book. I always kept a tech tips book, still do.
When on site, an overload is easily identified by the delay in overcurrent protective device (MCB) operating. Usually a few seconds or even minutes in some cases. A short circuit is generally instantaneous tripping sometimes accompanied by a small flash or popping sound at the MCB.
Depending on the size of fault current, the MCB can be rendered inoperable if the fault current exceeds the rated MCB's breaking capacity (usually 6kA for a BSEN 60898). Generally, 3 faults which exceed the breaking capcity will require a replacement MCB.
Theres lots more to this but you get the general idea.
Thanks for watching Mike. Thanks for the input, Dave.
@@learnelectrics4402 You're welcome Dave. Love watching your content! It keeps my mind fresh when my memory fails me. :) Best wishes, Mike
Great as usual
Thank you, great support, appreciated. Dave.
Love this video!! Thank you for all your hard work man!! Keep going please!
Every intention of making more videos. Thanks for watching.
Really simple & thorough explanation.. Thanks dave
Glad it was useful.
Wow! This is very informative, thanks for sharing it with us. It worth it and the best tutorial on the topic for me...wtc
Glad it was helpful Daniel. Thanks for the support.
Excellent Dave its so much clearer now.
Good to hear that, the video has done its job. Thanks for watching, appreciated. Dave.
Fantastically explained in simple way.Thank you Dave.
Glad it was helpful and I really appreciate the feedback. Thanks.
Excellent explanation Dave..
Please make a video on selectivity of circuit breakers.
Its on the list now. Thanks.
Really good video, very informative. Thanks
Glad it was helpful Paul, thanks for watching.
Good clarification and revision.
Glad you found it useful, thanks. Dave.
Cheers Dave 👍spot on as always 😎
Thank you Martin. I appreciate your support.
thank you Dave
Thank you Jamal, your support is appreciated. Dave.
very good explanation
Glad you think so and lots more to come. Dave.
Well done
Thank you Bashiru, appreciated,
great video...
Thank you, appreciated.
Great video once again👍🏻
Thank you. Appreciate your support.
Great video as always
Appreciate that Ram, thanks for watching.
Good stuff
Glad you enjoyed it Sergio. Thanks for watching.
A great video. Well explained. Just wonder on the diagram there is a path between line and neutral becomes a parallel path. When a parallel path can become short-circuit?
Absolutely. In the wrong place we will have a short circuit. The only place they should be connected is through the load. Thanks for watching. Dave.
@@learnelectrics4402 this makes a sense. Thanks for the answer.
Hi Dave
Can you please explain what i2 < 1.45 x iz is
That's a good theme for a video. It's on the list. Dave.
Hi sir..sorry and just need explanation about my situation. I have issue wiring short between E and N and rccb 100mA is not trip. This time no load is turn on. Reading of impedance loop is around 0 ohm.
* But whenever 1kW load rccb will trip.
If you don't mind I just need your explanation. Really appreciated and thank you.
Have a look at the two videos about RCBOs and RCDs.
ua-cam.com/video/Z1gwO-FsuNY/v-deo.html
ua-cam.com/video/6OgaB0BIj18/v-deo.html
👍
Thank you Brian, great support as always. Dave.
What is cpc meaning
CPC is circuit protective conductor.
Have a look at this video, iyt explains it as it goes along and will help you. Dave.
ua-cam.com/video/FtMUuj8GaZQ/v-deo.html
I am a DIY guy - When I use a two pole voltage tester on the live and neutral on an unenergised lighting circuit I get a 12+- volt read back. The same happens on the cpc. Therefore I think the is an earth fault somewhere on the circuit?
Disconnect the line and neutral at the CU. Volts test LE, LN and NE at the CU - neutral bar, earth bar, circuit breaker.and see what you get.
@@learnelectrics4402 thanks, I think for this I would need an electrician if it’s the consumer unit. Building Regs and all
I'm here again
You keep coming back Daniel. Thanks for watching.
Life is cruel, there is no name for the condition when neutral touches cpc. None of them has any pressure. people don't care about them.
Perhaps we could call it a cuddle. A neutral to Earth cuddle. Good point Sajad. Thanks for watching, Dave.
Overload is a sugar coated slow poison!
I think you forgot to mention about rodents!
Thanks for the input, appreciated, Dave.