This channel and its website, www.electricalstudent.co.uk are here to help students pass their Electrical Installation Level 2 and Level 3 exams. We are dedicated to helping all electrical students in explaining and showing the sometimes complicated and complex scientific theories and completing the testing procedures correctly. If you find a question you can't work out, or a formula you're unsure how to use, or if you need something explaining further, message the team and we will show you to complete the question. We will try our best to answer all questions posted.
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So im not sure why your testing pfc on the L-L L-N on the tester it should be L-PE for L to E pfc then for PSC should be L-L L-N setting both tests are 2 hi......
Hi there, I'll have a think about how to make a video as requested. I have been teaching level 2 and 3 electrical for many years and I so have a pretty good idea as to what will be asked in exams. Really it's just experience of the exams that allows me to navigate the books so well. For more formula sheets and helpful guides head to the shop at www.electricalstudent.co.uk
Any chance you can do a video on how you navigate on site guide. Like labelling it and how you understand it easily so you know what pages you have to get too. Thanks
No worries mate, glad they have helped you. For more help and guidance, including formula sheets and step by step guides check out the shop at www.electricalstudent.co.uk
Mate these collection of videos on level 3 science have saved me so much time and questions as i am currently studying for the exam, thank you, i really appreciate it.
The test you have performed is incorrect and is only testing the RCD for the DB and is not recorded on the sheet you have used. The RCD test for a circuit should be carried out at the furthest point of the circuit. This will take into account the circuit resistance R1+R2 and Rn. The test you carried out is only using the external impedance Ze at the DB and not the fault circuit as a hole. The aim of the test is to take the total resistance of the circuit, the fault path, which will determine how quick the RCD will trip under fault conditions, the higher the resistance the slower the trip time. Therefore the RCD test requires to be done on every circuit and recorded in the location you used. The test you carried out is recorded on sheet 2 under, Main switch / Switch Fuse / Circuit breaker / RCD, under "If RCD main switch". I would take this done before someone gets hurt and is traced back to your RU-vid. I am retired now but I am an Accredited Electrician.
thanks for your great video, but the question is when you try to find It, you had a look at table F6 which is for flat cables, while in the question asked for single core cable!!
It is difficult to make videos for different levels. If you're doing a cable calc from the OSG, then it's basic and you will be a level 2 student. When you start using BS7671, you'll be completing a much more indepth cable calculation, using all of the correct tables, depending on what type of cable you have. My videos are aimed at college students who are just starting out in their career. Which is another reason I'm trying to expose them to the many different C factors and reference methods. I'm glad you've found the video helpful in some way! 😊
The Green earth lead goes in the green L2 port on the back of a Megger Multifunction tester. Other testers will he different. You do not double the value for 3 phase. The earth fault current will only travel down one of the phase cables in 3 phase, to activate the protective device. Therefore even in 3 phase, the calculated Ipf will always be 230/Zs
Hello! That was really great. You explained things very well. You know when you did the test for ALL the circuits at once ? You mentioned you switched off the power and put the cable from the "load" end and the other cable to the earth/ Neutral. I was told by my teacher that an OVR can be damaged if you do this. Or does it mean you can do what you did as long as there is no digital OVR? Sorry for stupid question!!!
Your teacher is indeed correct. Some voltage sensitive devices such as an OVR and even some RCBOs can be damaged having 500V put through them. You are also correct, if your installation is a simple one, with no voltage sensitive equipment, like my small test board in the video, then it is fine to test the entire board this way. Look in Chapter 10 of your OSG and it gives pictures on performing this test
I'm confused if you're doing an RCD life test. And there are different ones when it comes to radios/ring. Which one do you do If ring s using the plug socket. And radials. Is using crocodile tips. Can anyone please explain. I thought RCD is one test.
See post above. The test you have performed is incorrect and is only testing the RCD for the DB and is not recorded on the sheet you have used. The RCD test for a circuit should be carried out at the furthest point of the circuit. This will take into account the circuit resistance R1+R2 and Rn. The test you carried out is only using the external impedance Ze at the DB and not the fault circuit as a hole. The aim of the test is to take the total resistance of the circuit, the fault path, which will determine how quick the RCD will trip under fault conditions, the higher the resistance the slower the trip time. Therefore the RCD test requires to be done on every circuit and recorded in the location you used. The test you carried out is recorded on sheet 2 under, Main switch / Switch Fuse / Circuit breaker / RCD, under "If RCD main switch". I would take this done before someone gets hurt and is traced back to your RU-vid. I am retired now but I am an Accredited Electrician.
Hi there, if you're doing the correct cross connections for the R1 + R2 test, as shown on p117 OSG. Then that reading is the correct R1 + R2 value. The test you would have done before, the end to end test for live, neutral and earth. Its those values, if you add the live and earth end to end value together, then divide by 4. You should get the same as the R1 + R2 value.
Ring circuit do you mean to do your L-L , N-N and CPC -CPC for step 1 And step 2 and 3 you do R1 +Rn and R1 +R2 but use the plug on the socket to step the process?????
first of all thank you for your presentation. secondly as it says in on-site guid to remove RCD, I wonder why you turned on RCD while you were doing insulation resistance test ?
Yes you remove all sensitive devices and also if you had a fault within a circuit you only did live to earth not live to neutral, good presentation but more detail needed
You should be using Your design current as this circuit can’t be overloaded. 433.1.1 says you can as long as it’s a greater value than both design & protective device rating currents. Using your way is not very practical in the real world & leads to larger & more expensive cables when they’re not really needed.
Unfortunately I have only uploaded work, explanations and questions for level 2 topics. Illuminance is covered in level 3 or years 2 and 3 of an Apprenticeship
Now that type A is the standard rcd's to be tested rather than when it used to be type AC rcd's, do i need a different function on my tester? I can't seem to find a setting on it which will change between the different types of rcd's
If you do not know the size of the cpc, then you match it to the size of the line conductor. In this instance, the live was 6mm. Looking at table I1 OSG, the milli ohm per metre value of 6mm live and 6mm earth is 6.16. This value is used to find out R1+R2 which eventually leads to the adiabatic equation of calculating S, the minimum csa size of the cpc
@Djredsielofficial Good pal, check out the website www.electricalstudent.co.uk for loads of mock test questions, all formula sheets and guide sheets to help with all of your exams!
This video will really help you, check out my level 3 formula videos when you start the maths and scientific principles module. There are formula sheets and a step by step cable calculations guide in my shop at www.electricalstudent.co.uk They will be really helpful to you
So, I just come across your video and I literally just copied my question into google and came here out of curiosity , my question is pretty much exactly like yours with the expectation of the cooker instead it is just one cooker at 10.37kW rather than yours which is 2 x 6.5Kw. I'm just wondering where did you get your question from? Mine is from Level 3 Advanced Technical Diploma in Electrical Installation Unit 303 Worksheet 11 Question 3 *2024*.
Hi pal. They are exam style questions I make up for students like you. For more exam style questions, formulae sheets and guides, check out www.electricalstudent.co.uk
@craigrod5728 you have added the first 12.43. Only add everything that has been underlined. Using diversity, you only use 75% of 12.43, which is 9.3. When totaling up the maximum demand, we only include the 9.3, not the 12.43
In short, yes. It is a test board, so there is actually fed from a board and RCD. I think the 2 cable, low test is a patent of Megger. Which prevents boards from tripping.
Thank you pal. you just save me nights trying to figure it out on my end. I am getting ready for my level 3 electrical installation test, now I feel more confident. thank you again
Glad to have helped you pal. Head over to www.electricalstudent.co.uk to find more tips and guides to help you pass your level 3 exams. Good luck in your upcoming exams!
Sir ek problem ye hai ki mere ghar ki electric bill bahut jada aara hai fir mai ne complaint kiya tho electric board wale bolte hai shyd aapki earthing problem hai ya aapke ghar ki wiring problem hai iske wajeh se aapki ghar ki electricity bill aa rahi hai ya aapke ghar ki freeze me problem hai ya aap ghr ki wiring cheak karo ya earthing proper karlo mai ne earthing cheak ki sahi hai bulb se cheak phase aur earthing acche se glow ho rahi hai abh wiring me kya cheak karna hai o batao sir aur proper earthing na hone se electric bill jada aati hai kya 400 unit aati hai har mahine plz help
WOW! You here about these truly unprofessional horror stories but I somehow think they're made up. I just wouldn't ever think there are tradesmen out there that actually do such dangerous practices! Thanks for sharing pal ❤
Observation Test to pipe ok this is prob grounded but does not prove cable is intact T over distance hidden in fabric of building , Personal view need to disconnect at bonding clamp and test continuity of 10mm back to board I’ve come across were the clamp at gas main has clamp short 10mm silicone into hall in wall going nowhere just to trick the eye , just some polite input and thank you
Thank you for doing what you do and I don't mean to be a keyboard warrior but I don't understand why you think that linking the L conductor to the E bar "tests all the other earths". The MFT sends a small current through the conductors and the only E that will be continuous is the E of the circuit you're testing?? Also at 6.31 you say that "we diconnected our L from the MCB and connected it straight into our E bar" - don't think you did that. You disconnected the E from the E bar and connected that to the L of the circit under test.
Did I..?? Sorry mate, my mistake. There is a possibility you will receive incorrect readings by leaving the earth in the earth bar. The tester will can potentially record the resistance of any and every conductive material that is connected touching the test probe at the time of testing
@@ElectricalStudentsUK Thanks for prompt reply. I hear what you say if you have several earths at the point of test, but if single radial circuit as here?
I think it's more there is a possibility. I'm not saying you definitely will, just that it is possible you would get a false reading. And for the sake of removing one cable, it's not really any additional time or effort
