![Electrical Student](/img/default-banner.jpg)
- 52
- 69 524
Electrical Student
Приєднався 20 лип 2023
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.
Visit www.electricalstudent.co.uk to find plenty more learning resources, formula pages and 1000's of mock test questions
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.
Visit www.electricalstudent.co.uk to find plenty more learning resources, formula pages and 1000's of mock test questions
Illuminance (part 2) formula explained and transposed
Lay out your revision page on illuminance formula exactly like this. Formula needed to calculate illuminance questions, explained, transposed all ways, what each letter stands for and each SI unit of measure given.
For formula sheets and detailed guides, look in the shop at
www.electricalstudent.co.uk/category/all-products
BS7671 18th Edition amendment 2
amzn.to/44pCl0a
On - Site Guide 18th Edition amendment 2
amzn.to/3YOnGKQ
Casio Scientific Calculator
amzn.to/47NJNFe
Multi coloured pen
amzn.to/3EcKWbT
15cm ruler
amzn.to/44v0rXg
30cm ruler
amzn.to/44q8ox1
Folding ruler
amzn.to/45qJ7UP
Black writing pens
amzn.to/3EdnxqI
For formula sheets and detailed guides, look in the shop at
www.electricalstudent.co.uk/category/all-products
BS7671 18th Edition amendment 2
amzn.to/44pCl0a
On - Site Guide 18th Edition amendment 2
amzn.to/3YOnGKQ
Casio Scientific Calculator
amzn.to/47NJNFe
Multi coloured pen
amzn.to/3EcKWbT
15cm ruler
amzn.to/44v0rXg
30cm ruler
amzn.to/44q8ox1
Folding ruler
amzn.to/45qJ7UP
Black writing pens
amzn.to/3EdnxqI
Переглядів: 222
Відео
Illuminance formula explained and transposed
Переглядів 2236 місяців тому
Lay out your revision page on illuminance formula exactly like this. Formula needed to calculate illuminance questions, explained, transposed all ways, what each letter stands for and each SI unit of measure given. For formula sheets and detailed guides, look in the shop at www.electricalstudent.co.uk/category/all-products BS7671 18th Edition amendment 2 amzn.to/44pCl0a On - Site Guide 18th Edi...
Neutral cable current formula explained and transposed
Переглядів 2146 місяців тому
Lay out your revision page on calculating current in the neutral cable formula exactly like this. Formula needed to calculate current in the neutral cable questions, explained, transposed all ways, what each letter stands for and each SI unit of measure given. For formula sheets and detailed guides, look in the shop at www.electricalstudent.co.uk/category/all-products BS7671 18th Edition amendm...
Power triangles explained
Переглядів 2317 місяців тому
Lay out your revision page on power triangles exactly like this. For formula sheets and detailed guides, look in the shop at www.electricalstudent.co.uk/category/all-products BS7671 18th Edition amendment 2 amzn.to/44pCl0a On - Site Guide 18th Edition amendment 2 amzn.to/3YOnGKQ Casio Scientific Calculator amzn.to/47NJNFe Multi coloured pen amzn.to/3EcKWbT 15cm ruler amzn.to/44v0rXg 30cm ruler ...
Apparent power formula's explained and transposed
Переглядів 1577 місяців тому
Lay out your revision page on all of the apparent power formula exactly like this. Formula's are needed to calculate apparent, true and reactive power questions, explained, transposed all ways, what each letter stands for and each SI unit of measure given. For formula sheets and detailed guides, look in the shop at www.electricalstudent.co.uk/category/all-products BS7671 18th Edition amendment ...
Reactive power formula's explained and transposed
Переглядів 1227 місяців тому
Lay out your revision page on all of the reactive power formula exactly like this. Formula's are needed to calculate apparent, true and reactive power questions, explained, transposed all ways, what each letter stands for and each SI unit of measure given. For formula sheets and detailed guides, look in the shop at www.electricalstudent.co.uk/category/all-products BS7671 18th Edition amendment ...
True power formula's explained and transposed
Переглядів 1507 місяців тому
Lay out your revision page on all of the true power formula exactly like this. Formula's are needed to calculate apparent, true and reactive power questions, explained, transposed all ways, what each letter stands for and each SI unit of measure given. For formula sheets and detailed guides, look in the shop at www.electricalstudent.co.uk/category/all-products BS7671 18th Edition amendment 2 am...
Impedance formula (part 2) explained and transposed
Переглядів 1757 місяців тому
Lay out your revision page on impedance formula exactly like this. Formula needed to calculate impedance questions, explained, transposed all ways, what each letter stands for and each SI unit of measure given. For formula sheets and detailed guides, look in the shop at www.electricalstudent.co.uk/category/all-products BS7671 18th Edition amendment 2 amzn.to/44pCl0a On - Site Guide 18th Edition...
Impedance formula (part 1) explained and transposed
Переглядів 3057 місяців тому
Lay out your revision page on impedance formula exactly like this. Formula needed to calculate impedance questions, explained, transposed all ways, what each letter stands for and each SI unit of measure given. For formula sheets and detailed guides, look in the shop at www.electricalstudent.co.uk/category/all-products BS7671 18th Edition amendment 2 amzn.to/44pCl0a On - Site Guide 18th Edition...
Inductance and inductive reactance explained and transposed
Переглядів 3098 місяців тому
Lay out your revision page on the delta formula exactly like this. Inductance and inductive reactance formula, explained, transposed all ways, what each letter stands for and each SI unit of measure given. BS7671 18th Edition amendment 2 amzn.to/44pCl0a On - Site Guide 18th Edition amendment 2 amzn.to/3YOnGKQ Casio Scientific Calculator amzn.to/47NJNFe Multi coloured pen amzn.to/3EcKWbT 15cm ru...
CIVIL - reactance, leading or lagging
Переглядів 3088 місяців тому
Lay out your revision page on the CIVIL exactly like this. Using the mnemonic CIVIL to learn if the inductive reactive or capacitive reactance has a leading or lagging current. BS7671 18th Edition amendment 2 amzn.to/44pCl0a On - Site Guide 18th Edition amendment 2 amzn.to/3YOnGKQ Casio Scientific Calculator amzn.to/47NJNFe Multi coloured pen amzn.to/3EcKWbT 15cm ruler amzn.to/44v0rXg 30cm rule...
Capacitance and capacitive reactance explained and transposed
Переглядів 2969 місяців тому
Lay out your revision page on the delta formula exactly like this. Capacitance and capacitive reactance formula, explained, transposed all ways, what each letter stands for and each SI unit of measure given. BS7671 18th Edition amendment 2 amzn.to/44pCl0a On - Site Guide 18th Edition amendment 2 amzn.to/3YOnGKQ Casio Scientific Calculator amzn.to/47NJNFe Multi coloured pen amzn.to/3EcKWbT 15cm ...
Energy in a capacitor formula explained and transposed
Переглядів 1319 місяців тому
Lay out your revision page on the delta formula exactly like this. Energy in a capacitor formula, explained, transposed all ways, what each letter stands for and each SI unit of measure given. BS7671 18th Edition amendment 2 amzn.to/44pCl0a On - Site Guide 18th Edition amendment 2 amzn.to/3YOnGKQ Casio Scientific Calculator amzn.to/47NJNFe Multi coloured pen amzn.to/3EcKWbT 15cm ruler amzn.to/4...
Energy in an inductor formula explained and transposed
Переглядів 1599 місяців тому
Lay out your revision page on the delta formula exactly like this. Energy in an inductor formula, explained, transposed all ways, what each letter stands for and each SI unit of measure given. BS7671 18th Edition amendment 2 amzn.to/44pCl0a On - Site Guide 18th Edition amendment 2 amzn.to/3YOnGKQ Casio Scientific Calculator amzn.to/47NJNFe Multi coloured pen amzn.to/3EcKWbT 15cm ruler amzn.to/4...
Star formula explained and transposed
Переглядів 2019 місяців тому
Lay out your revision page on the delta formula exactly like this. Star formula, explained, transposed all ways, what each letter stands for and each SI unit of measure given. BS7671 18th Edition amendment 2 amzn.to/44pCl0a On - Site Guide 18th Edition amendment 2 amzn.to/3YOnGKQ Casio Scientific Calculator amzn.to/47NJNFe Multi coloured pen amzn.to/3EcKWbT 15cm ruler amzn.to/44v0rXg 30cm ruler...
Delta formula explained and transposed
Переглядів 24810 місяців тому
Delta formula explained and transposed
How to use and transpose the transformer equation
Переглядів 55410 місяців тому
How to use and transpose the transformer equation
Transformer power formula explained and transposed
Переглядів 28310 місяців тому
Transformer power formula explained and transposed
Transformer formula - Transformer formula explained
Переглядів 57410 місяців тому
Transformer formula - Transformer formula explained
Cable calculation. Calculating the live cable size from BS 7671
Переглядів 12 тис.10 місяців тому
Cable calculation. Calculating the live cable size from BS 7671
Guide to completing an R1 + R2 test on a radial circuit and how to complete the test sheet.
Переглядів 2,4 тис.10 місяців тому
Guide to completing an R1 R2 test on a radial circuit and how to complete the test sheet.
Guide to completing the prospective short circuit current and prospective earth fault current test
Переглядів 2,5 тис.10 місяців тому
Guide to completing the prospective short circuit current and prospective earth fault current test
Electrical quantity - electrical quantity formula explained and transposed
Переглядів 230Рік тому
Electrical quantity - electrical quantity formula explained and transposed
F=BIL formula - F=BIL formula explained and transposed
Переглядів 332Рік тому
F=BIL formula - F=BIL formula explained and transposed
Power formula - all three circuit power formula explained and transposed
Переглядів 269Рік тому
Power formula - all three circuit power formula explained and transposed
Efficiency - efficiency formula explained and transposed
Переглядів 205Рік тому
Efficiency - efficiency formula explained and transposed
Force formula - force formula explained and transposed
Переглядів 101Рік тому
Force formula - force formula explained and transposed
Power formula - circuit power formula explained and transposed
Переглядів 140Рік тому
Power formula - circuit power formula explained and transposed
e=Blv formula - e=Blv formula explained and transposed
Переглядів 308Рік тому
e=Blv formula - e=Blv formula explained and transposed
Ohms law formula explained and transposed
Переглядів 310Рік тому
Ohms law formula explained and transposed
Thanks Dan very helpful!
Thank you very much! very to the point and informative
This only works with all loads lamps and all equipment removed eg socket pulled out the only with load in is l,n together to ccp
What book are you referring too ??
This is the On Site Guide to BS7671
@@ElectricalStudentsUK do you have a link to purchase the book I'm starting to do more testing and I'd like to read up on more just to keep up the standard !!
@nateryan7041 Here it is from amazon. Chapter 10 is testing www.amazon.co.uk/Site-Guide-7671-Electrical-Regulations/dp/1839532270/ref=mp_s_a_1_1?crid=2KA48ABV0R3IH&dib=eyJ2IjoiMSJ9.CmFov_R1ObmOJvcm_VkNDZYKGHNeakacLk3liDRpTCjc7tAdTZmRUvefNeMO1QECUCymwNujty5pDnYYQKkbtZi7319OCD3BwzHu1k4haegDkc77HWsBt5xGrl4P8hF5W9evggftMINmsuKnyBTf1DTY_TiYOUH__6rdraw-slVH6bIUDiEEjz5hhxgAaaL-1tvucKQaTlOnqofOSreJfw.tDLEThCY61VSoLESpvyNW83cTHNo_Ra0KHC48lUAhAc&dib_tag=se&keywords=on+site+guide+electrical+2024&qid=1724526865&sprefix=on+sire+guide%2Caps%2C209&sr=8-1 For more detailed testing read Guidance Notes 3, although this is aimed at a 'test and inspection qualified electrician. www.amazon.co.uk/Guidance-Note-Inspection-Electrical-Regulations/dp/183953236X/ref=mp_s_a_1_1?crid=1QW6AMLLDOZ3N&dib=eyJ2IjoiMSJ9.EB6IxV44MWZxPOCoxiKybHE6w9Vh4Y303Y0BL2neSpaKz0p9it0Nb7TUwnF75c47q6gwByl518szeqMkz2sqL9gNLQsmLj0bOSTF_Yww_hRtMLlihbJ5kOgltcHo53rwfeMiVzBsd6j1CyF9fZreGqPUPFydiNTxDxQOKPhkYwtN13DhMiNYzehQJJOowAHSkSS27ZlwELVIPv5-3-1xbQ.kmZpGsceMHVwmNqsnJq8HjUOt9DJXE1OBiUZ3hvFBq4&dib_tag=se&keywords=guidance+notes+3&qid=1724527047&sprefix=guidance+notes+3+%2Caps%2C81&sr=8-1
Question has given the three phase existing circuit but you calculated it on 230 single phase why ? please explain?
Hi, a closer look at the picture shows a three phase supply to the board. But the final circuit to the lights is a single phase. Imagine a commercial or industrial property. Three phase supplies to the boards, but the lighting and power final circuits from those boards would be single phase
great video, for a full board do all lights switches need to be open ? also do you do any testing using a fluke ?
@Badger8169 Thanks! Have a read of page 118 OSG. You should remove lamps, test, then operate any 2 way switches, test again. This is due to possibly damaging customers lamps with a 500V test. Also the second test is to test the other cables used in two way switches. Known as the strappers. I haven't any videos with flukes. I've used flukes and find them really complicated for a first time user.
@@ElectricalStudentsUK Ive bought a fluke 1664 fc and struggling ! think i should have bought a megger as all demonstrtations seem to be with one thanks for the reply
Thanks for the amazing guide and much appreciated. However while calculating design current Ib, shouldnt power factor PF be considered? epecially in this case of water heater?
Nice video good explanation but your hand is on the way we can not see RCD tripping ❤❤❤❤
👋 😂 sorry pal. Promises it is tripping!
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......
Useless video
😢😢😊
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.
Well explained chap!
Is that the 1st time you opened that regs book or do you keep it in a safe? Mine looks like a tiger was reading 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 UA-cam. I am retired now but I am an Accredited Electrician.
I have been a qualified electrician for thirty eight years. Point one what is an accredited. There is no legal requirement or regulation requirement for any spark to be registered/accredited . Never has been. The purpose of the RCD test is to determine if it will trip within a specified time ie at 1x its rated current we expect it to trip in less than 300ms at 5x in less than 40ms . We can test at the socket or the CU . If you already know what the Ze and Zs values are and you want to know the the RCD will operate at we do a ramp test which will tell how much current it takes for the RCD to operate.
Watch the video again. He did the test correctly. He clearly tested the lighting circuit and he probed onto the outgoing side of the MCB . If he did what you are talking about then he would test at the top of the RCD ie green lead on the earth bar brown probe on the RCD line and blue probe on the RCD Neutral. .
6:38 Clipped direct: Would than not be "Single Layer on Wall or Floor" row in table F3 ?
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! 😊
I was wondering Zs is measured in Ω not time. But glad you corrected that.
Where did you input the earth lead in the back of the tester for the test? also do you double this value if its 3 phase?
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
@@ElectricalStudentsUK Thank you!
Your handwriting beautiful
Well done,excellent and clear explanation, may God bless you ,thanks
Thank you, I hope my explanations help with your learning journey
@@SpinSkins your explanation really helped me understand some things that were Ambiguous to me. Thanks 🙏
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 UA-cam. I am retired now but I am an Accredited Electrician.
Hey mate when you're doing R1 R2 for ring. Are you meant to add them up and divide it by 4?
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.
Brilliant thank you so much mate
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?????
😒 Promo SM
You are a legend, best video on cable calcs hands down.
@@SpinSkins Would you know the formula on how to work out the Iz of a 4mm ring circuit?
Thank you mate, glad my videos help you
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.
Great knowledge refresher buddy. Keep up the good work
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
Hi Daniel, on your website,are there exercises to practice with all this for formulas? Thanks
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
The RCD setting on most tester will test any type of RCD. You only need to change the mA setting that matches the mA rating of your RCD
No you are only required to test the RCD/RCBO on the Ac setting at it rated close ie 30ma regardless of what type the RCD is and you only need to test at one times half time and five times test is no longer required.you can do them if you want to but you are not required to do them.
I still couldnt understand where that 6.16 came from while i was expecting 2.5
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
Thank you@@ElectricalStudentsUK
Thank goodness I finally found someone who can explain this stuff in a way I can understand it.🙌
Minutes 13, should be written mV/A/M.
Yes well spotted! Sorry for my mistake
Thanks for your informative educational videos. 👍
No worries mate. Anything you're unsure of and want me to go over for you, let me know
🙏 the journey begins 😅
Are you doing level 2 or level 3?
@@ElectricalStudentsUK level 2 & 3 😁
@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!
@ElectricalStudentsUK Thanks mate . signed up mate Waiting for confirmation 👍
Just what I needed Thank you
No worries. Glad the video has helped you
Could you please do a video on the tabs you’ve got on your regs book, looks so much easier to navigate. 🙏
Great video. Starting my lvl 3 next week
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
Thanks for another great video..
Thank you, mate, for your time. I bought the tabs very helpful.
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
Hi am just wondering when you add up the total I got 188.8 I don't understand how u got you're answer can you please show me thank you
@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
Oh ok got that thanks
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.
Why did you use 2 Lo and not 2 hi, was this because you have an upstream RCD?
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!
Great vids but any chance you could do video explaining what high or low readings etc on test could mean please?