Fault Finding Testing for Insulation Resistance. Low Reading Insulation Resistance Fault
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- เผยแพร่เมื่อ 24 ต.ค. 2020
- How to test for insulation resistance inside a consumer unit. Marcus is carrying out an electrical inspection and testing when he come across a fault giving him a low reading during the insulation resistance test. These videos will help with AM2, AM2S, AM2E and your apprenticeship end point assessments. The testing and fault finding is carried out with a Megger MFT tester in controlled conditions at Tresham College.
Electrical fault finding
Videos are training aids for City and Guilds (C and G) and EAL courses Level 1, 2, 3 plus AM2, AM2S and AM2E.
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im in my 2nd year now of my apprenticeship, and you are truly dedicated to teaching to the highest standard. my teachers are okay but i really wish you were teaching at my college. very good videos thanks. i probably learn more from these than i do at work and college :'D
Keep working hard it has its rewards 🦾. All the best and thanks for commenting. Gaz
@@GSHElectrical definitely. A week on Friday I have my 18th edition exam so fingers crossed 😄
Great help and refresh thanks, especially with my lvl3 live/dead testing and fault finding assessment tomorrow (having been waiting, and out of the loop, since April).
Fantastic demonstration guy’s.
It’s always good to keep learning and refresh your memory and keep on top of how we do things like testing and so on.
Fantastic video guy’s as always 👍👍👍❤️
Excellent video guys I really enjoy the testing elements as they get your mind working. 👍
Not just "some help" you're being a great help! Thanks a lot from SE London
Thanks 🦾
Brilliant video and very informative. Easy to understand and gives you the confidence to investigate step by step
I'm not a electrician but mess with electronics, these videos always show how to test for fault finding and I've learned alot from watching these great videos on TH-cam.
Thanks for all you trademarks who show your skills to others because I've learned watching someone showing there trade rather than reading a trade
Thanks for the kind words Colin 👍🏻
mate these testing videos are absolutely brilliant, so helpful! Thank you guys :)
Thanks for watching and the support 👍🏻
Thanks for the informative videos much love from 🇺🇬
All videos are in great and professional detail. Very recommend to anybody in this trade.
Thanks I totally appreciate your support 👍
excellent stuff, thanks for the help
Great video again! All testing videos would be helpful. Thanks.
Checkout my playlists for many more testing videos 🦾. Thanks Gaz
Excellent video, thanks guys 👍
Love these fault finders :)
Really delighted Iwatched it. very educative
Great keep them coming 👍👍👍
Good effort lads
excellent video Marcus since you are doing a run of fault finding videos may be you could done some thing on Erroneous connections .
Thank You
If it is lighting and as you say split the circuit mid point and the leg coming from the board is clear i connect back up then youv got lighting to some of the property while you find the fault on the other leg, usefull if its getting dark at least theyl be light coming in same on a Ring main lets say split mid way whichever leg is clear bang back in the breaker at the board temporarily gets half the sockets on 👍 great videos these
As always good one again
i learned more here than i did in college , good teachings ,thumbs up
Massive thanks for the support 👍🏻
Thank you 🙏
Love to join ur college great video again. Keep them coming for us all ive learnt loads from ur vids 👌🏾
Thanks for the positive comment 🦾. Gaz
@@GSHElectrical thanks Gaz, love watching how well u present ur classes there so detailed .. appreciate them all .. i can say im keen watcher 👍🏽
Brilliant help, videos always very useful keep it up guys
Thanks for the support 👍
Great clear video. Thanks for uploading. Is there a way to get MFT testers at reasonable price for persons who are able to afford one?
Excellent 👍
Ottimo video e ottima spiegazione
As an adult learner anything on fault finding is a great help. Coincidentally, I've been watching JW's videos on "borrowed neutrals" so a future video on how to find one using IR would be great. Thanks again for the video.
I’m an adult learner as well. How do you find your course? I’m a bit disappointed with the lack of practical training from the course provider.
@@andreradu7348 I'm an adult learner too, you can't expect a lot of practical training if you are studying at a slow pace and in your own home, to get the experience you want you will have to find a job as an improver (provided you pass the building regs phase and get a ECS/CSCS card), find an electrician willing to take you on as an apprentice. The only way you will get practical learning sessions is if you go to college for it.
@@titmando1199 Being an apprentice at 25 with an average of 150-200 quid a week isn’t doable. Unless you live with family and all expenses paid for. I heard that certain course providers do offer workshops on a regular basis for all students regardless of levels, hence my comment. Electrician mate jobs are scarce in my area and when they do come available they get filled up quickly. College is a good alternative which I was looking into but unfortunately next term starts in mid-September 2021 😓
Thank you so much for teaching me
Thanks 👍🏻
Thank you very much
Excellent videos
Thanks 👍🏻
Good work
Thanks
How can I master the insulation resistance and loop empedence testings????
Help👏🏾
When testing across Neutral and earth. Whats the minimum reading you would expect an rcd to trip out.
Great intuitive videos as usual - keep up the good work - However, getting annoyed with all instructive/educational vids which do not allow for real life / on-site realistic approach/procedures. Does anyone else agree some vids should cover this. Example - Testing insulation resistance (Nobody removes lamps, dimmers, pirs, fluorescent lighting, batteries etc etc, it would take an age. So why not demonstrate test at 250v procedure with L/N connected together and testing them to earth ?? Opinions on this?
Here in NZ the megger voltage is around 1000v. Do your regs call for 250v testing ? Interesting to see how regs vary form country to country. Ring ccts are illegal here too.. In order to keep our registration active we are required to do a refresher course every two tears... I mean years.. :) Last refresher I was a week late and I received an email stating I must not do prescribed electrical work even tho I have a spotless track record for the last 40 years. Another interesting fact thats way over the top IMO is if you fit a back to back power point ( or GPO) the 6inches of cable requires to be insulation tested. Insulation testing goes hand in hand with earth loop impedance tests.
Very helpful
Thanks
My driveway lights15 keep tripping my kitchen circuit but the outside driveway lights are on there own switch on the board. The light can be on for 2min or 20mins then trip. How do I find exactly what is causing the fault in the driveway lights 🤯not a sparky
Great 😎😎
Gaz, What's your opinion on EAL vs City and Guilds? I've gotten some mixed opinions vs the two. I'm currently an apprentice doing EAL as that was all my college offered. Thanks, your videos are amazing.
He is an EAL guy for full time learners and C and G for apprenticeships 👍
Good ol' Binary Chop search!
Turn the circuit on Listen and look for arcing and smell for smoke!
Then get the tester out
Any links or tips for taking my 2391 guys?
Hello. I live in a rented property and have been told that I have an insulation resistance fault that was apparently found a couple of years ago and that an electrician will need to visit me. This may be a silly question but my house is quite crowded and all my power-points are behind book shelves with extension leads plugged in. Will he need access to all power-points please? This will be a bit of a task to sort before he arrives. Thanks for anyone who can answer this 🙂
Hi please help me on this, both my live and neutral are positive.
What if you have spot light and cant remove them all? What to expect?
GREAT
Thanks
❤with that kind of fault would the circuit still if you don't have to do anything. 😊
It's like continuity Tester right?..
Could you clarify? if I was doing a global IR test, and I got a reading of below 2 Meg Ohms, say 1.5 Meg Ohms. Then I would be required to investigate further, and test the individual circuits. And if I found one particular circuit was reading say 1.8 MegOhms then all would be ok as it’s above the minimum of 1 Meg Ohm as stated in bs7671. (assuming it was an eicr and not a new install). So on the test form would I still write the 1.5MegOhms? Being the global reading across the installation as a whole. Or would you write individual circuit ir readings on the form?
It’s the overall insulation resistance of the board to be 1 MegOhm or more not individual circuits. It’s the old resistors in parallel calculation to find the overall resistance. If you had 6 circuit of 200MegOhms and one of 2MegOhms the overall insulation resistance would be less than 2MegOhms. Thanks for commenting and watching. Gaz 🦾
Would the test between neutral and earth not show zero ohms if the neutral was ultimately connected to the earth at the centre tap of the star side side of a delta/star supply transformer feeding the installation, or am I missing something?
You disconnect the earth so that doesn't happen
What happens if the lines were dropped in and out of a lighting point but not in order of distance from the board? Daisy chained all over the place? As you occasionally find in older added on installations?🤔
Dont think it matters, as long as insulation tests are done and the cable/installation is fit for purpose.
It says have all RCDs off. I assume this is the case also for RCBO's?
👍
Hey, can i please ask an electrical question...i have an old cottage, Rcd consumer unit fitted but went to change bedroom light fixture and found Red, Black and a bare wire ...does a qualified Electrician fit Blue to Red, Brown to Black and green/yellow to the bare wire? 😉 Thanks
Don’t do that your fuse will pop . Red is brown and blue is black in the UK👌
@@garethrowlands1305 Cheers!!
It's suggested you remove all lamps etc before IR testing. If there were an abundance of downlights, would you be required to disconnect all of these?
I was wondering that and what about stuff like cookers and other connected appliances?
I refer to it as the split/half method.
Nice 🦾
Hi guys,
I noticed there was no Live conductors to earth test carried out i.e. line and neutral combined to earth. Is that test not relevant. If not how would we record this on our test result. Would it have been worst of the two readings for L-E or N-E dependent which of the two had the lowest reading?
Love to know this as I always get confused.
Combined Insulation Resistance Test Line and Neutral Together to Earth & Between Live Conductors th-cam.com/video/xH5FxehSpM4/w-d-xo.html
This may help 🦾. Thanks Gaz
Let’s say it’s an old instillation And the lighting circuit was just 1 light and let’s say 20 cm away from the point of test . If the result was still just over 1megohm . I thought that would still be a pass ? I still agree there’s something sinister going on but as far as I’m aware that’s still a pass . Obviously I’m not talking About new installations. Any feedback would be great
Would you have to test for continuity before carrying out a insulation resistance test?
glad Harry Maguire has retrained... football wasn’t for him 😂
999 likes
Thanks 👍🏻
Why bother turning the outlets to the on position?
So the insulation resistance gets to the front of the socket outlets (IR test with all switches on). Thanks for commenting. Gaz 🦾
It's megohms not "megaohms"..
Love watching your videos
Much better than artisan
Good job lads
Massive thanks for the support 👍🏻
All the best mate keep up the good work .
Your really helping a lot of lads realise their dreams