I havent done a lot of testing, but I’m pretty sure I was taught when doing an IR test on an individual circuit, that you have to disconnect the neutral conductor out the neutral bar, and the CPC out the earth bar for that particular circuit? Because you’re testing that particular circuit? For example you’d disconnect the neutral and cpc out the fuse board and then put your crocodile clips on to those conductors and your probe into the outgoing side of the MCB??
@LP92LEO It's actually either or really. The OSG shows both, GN3 shows to leave them in. As its a kind of pressure test and way of locating criss connections, if we test our circuit and part of another at the same time, its irrelevant. Our circuit has passed that test. The time to start removing the cables would be if a faulty reading was given. This would aid you in pin pointing the faulty circuit. Although there other ways of pin pointing a faulty insulation resistance test.
Amendment Two requires for initial verification first fix we test at 500v second fix when accessory’s are installed and for periodic inspection we test at 250v and sensitive equipment can not be removed we tested line and neutral combined and test to earth . Also A 500v ir test will not damage electronic devices but you will get doggie readings. I have test the ring main in my house at 500vDC with the TV plugs in on on and the digital twenty four hour timer switch for my fish tank LED light plugged in and guess what they still work perfectly fine
Probably the best video on RUclips on this test with the use of onsite guide. My recommendation would be if you can, redo the video again with better quality. Other than that you have gained a subscriber.
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
@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
Because RCD's are deemed voltage sensitive equipment so care must be taken. They need checking as to whether they will be damaged. Check the manufacturers data sheets, or, they should be disconnected so they are not included in the 500V insulation resistance test. Page 68 in Guidance Notes 3 details this
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
@@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
@ElectricalStudentsUK thank you I just need to clear that up and be 100% certain. I live in south africa and just wanted to make sure you feed your mains into the top of the breaker as well . I've worked on other sites where they feed the mains from the bottom of the breaker . Anyways good video , good to refresh again .
Amendment 2 tells you to complete test at 500V. Only test at 250V on 230V installation if the 500V test would damage equipment that you are unable to remove prior to the test
Please improve the quality of your videos, two the supply voltage in the UK is 240v AC , we only use 230v for our calculations . Otherwise a good demonstration and explanation.
@@Dog-whisperer7494 hi there, I'm trying to figure out how to improve the quality when I show the OSG. I'll do better on my next set of videos. Not that I want to disagree with you good sir, but nominal voltage dropped to 230V in 1995. Allowing for national grid to supply us with voltages as low as 216V with their -6% tolerance. And thank you for your support and appreciation. I will do better for you next time
@@ElectricalStudentsUK yes but they didn’t physically drop the voltage, they couldn’t do it as lower voltage would result in more usage and that would put a massive strain on the grid. What they did was lower the calculation voltage from 240 to 230 and that allowed the +-tolerance ie the supply voltage can be +-6% giving us a voltage as low as 218 v and as high as 258v it was all to do with unification with the rest of Europe . As I said we only use 230 instead 240 for our calculations . Put a voltmeter on the incoming side of your main switch and I bet you get 238-242/3 volts. I was being tort about back in the late eighties when I did my electrical course at college. Unification was also the reason we changed from Red and Black to Brown and Blue black for mains cables single phase, and from Red yellow blue to Brown black grey and blue for three phase.
Please improve the quality of your videos, two the supply voltage in the UK is 240v AC , we only use 230v for our calculations . Otherwise a good demonstration and explanation.
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
Connecting L and N and testing between that and E is how you complete the test with sensitive equipment that you can't remove. The neon in a cooker switch will give false, low readings, but doing the test as described will work, without the need to disconnect the neon. Not many people actually know/do this! Completing the test this way also means you must note it in the remarks column on the test sheet. Page 118 to 120 in the OSG shows completing the insulation test as I have done in the video. That way you can complete the test sheet correctly. Column 23 wants the test between L and N and column 24 between L and E
Best video for this test on the internet. Subscribed!
I havent done a lot of testing, but I’m pretty sure I was taught when doing an IR test on an individual circuit, that you have to disconnect the neutral conductor out the neutral bar, and the CPC out the earth bar for that particular circuit? Because you’re testing that particular circuit? For example you’d disconnect the neutral and cpc out the fuse board and then put your crocodile clips on to those conductors and your probe into the outgoing side of the MCB??
@LP92LEO It's actually either or really. The OSG shows both, GN3 shows to leave them in. As its a kind of pressure test and way of locating criss connections, if we test our circuit and part of another at the same time, its irrelevant. Our circuit has passed that test. The time to start removing the cables would be if a faulty reading was given. This would aid you in pin pointing the faulty circuit. Although there other ways of pin pointing a faulty insulation resistance test.
Need to test your meter and your meter leads before and after taking Megger readings - that's quite important you know!
Amendment Two requires for initial verification first fix we test at 500v second fix when accessory’s are installed and for periodic inspection we test at 250v and sensitive equipment can not be removed we tested line and neutral combined and test to earth .
Also A 500v ir test will not damage electronic devices but you will get doggie readings. I have test the ring main in my house at 500vDC with the TV plugs in on on and the digital twenty four hour timer switch for my fish tank LED light plugged in and guess what they still work perfectly fine
I learned how to do insulation resistant for whole board
Good information video
@@JaswinderSingh-px3qw Brilliant! I am glad to have helped you
Probably the best video on RUclips on this test with the use of onsite guide.
My recommendation would be if you can, redo the video again with better quality.
Other than that you have gained a subscriber.
Thank you mate - I am glad you found the video useful.
Yep sorry about some of the quality, I'm still learning how to make videos!
Hi, what tool used for testing
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
Great job sir ❤❤❤❤
I look forward to seeing more videos from you.
Oh and no disrespect intended.
Mate none taken. Its good to have valued discussions - especially when it comes to that bloody book! BS7671
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
Why do some people say RCD's should be off? Same for SPD's as they could be damaged with 500v IR test?
Because RCD's are deemed voltage sensitive equipment so care must be taken. They need checking as to whether they will be damaged. Check the manufacturers data sheets, or, they should be disconnected so they are not included in the 500V insulation resistance test. Page 68 in Guidance Notes 3 details this
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
Fantastic Explanation !!!!
Thank you!
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
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
At 5:40 does your supply from council enter the top or bottom on the main mcb ?
@@jonerasmus9399 Mains supply goes into the top of the main switch
@ElectricalStudentsUK thank you I just need to clear that up and be 100% certain. I live in south africa and just wanted to make sure you feed your mains into the top of the breaker as well .
I've worked on other sites where they feed the mains from the bottom of the breaker .
Anyways good video , good to refresh again .
To Amend 2? Not 250V first? No reciprocal calc?
Amendment 2 tells you to complete test at 500V. Only test at 250V on 230V installation if the 500V test would damage equipment that you are unable to remove prior to the test
For initial verification it is always 500 V regardless of inconvenience.
Please improve the quality of your videos, two the supply voltage in the UK is 240v AC , we only use 230v for our calculations .
Otherwise a good demonstration and explanation.
@@Dog-whisperer7494 hi there, I'm trying to figure out how to improve the quality when I show the OSG. I'll do better on my next set of videos.
Not that I want to disagree with you good sir, but nominal voltage dropped to 230V in 1995. Allowing for national grid to supply us with voltages as low as 216V with their -6% tolerance.
And thank you for your support and appreciation. I will do better for you next time
@@ElectricalStudentsUK yes but they didn’t physically drop the voltage, they couldn’t do it as lower voltage would result in more usage and that would put a massive strain on the grid. What they did was lower the calculation voltage from 240 to 230 and that allowed the +-tolerance ie the supply voltage can be +-6% giving us a voltage as low as 218 v and as high as 258v it was all to do with unification with the rest of Europe . As I said we only use 230 instead 240 for our calculations . Put a voltmeter on the incoming side of your main switch and I bet you get 238-242/3 volts. I was being tort about back in the late eighties when I did my electrical course at college. Unification was also the reason we changed from Red and Black to Brown and Blue black for mains cables single phase, and from Red yellow blue to Brown black grey and blue for three phase.
Please improve the quality of your videos, two the supply voltage in the UK is 240v AC , we only use 230v for our calculations .
Otherwise a good demonstration and explanation.
>999 on the sheet rkid
great video. please improve video quality
Glad you liked the video. Sorry you're not impressed with the video quality. I used a 4k camera so I'm afraid that's the best I can do bud
@@ElectricalStudentsUKit’s a 480p video, if you used a 4k camera, render with a higher quality on a better rendering site to improve quality 😊
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!
Why keep Neutral in the N bar? I thought we remove both Live and Neutral and connect them and then meaure to CPC
Connecting L and N and testing between that and E is how you complete the test with sensitive equipment that you can't remove. The neon in a cooker switch will give false, low readings, but doing the test as described will work, without the need to disconnect the neon. Not many people actually know/do this!
Completing the test this way also means you must note it in the remarks column on the test sheet. Page 118 to 120 in the OSG shows completing the insulation test as I have done in the video. That way you can complete the test sheet correctly. Column 23 wants the test between L and N and column 24 between L and E