Insulation Resistance Testing of 2 Way and Intermediate Switching Using Guidance Notes 3 AM2 or AM2S
The AM2 AM2S test centre at Luton indicated that they expect all tests to be carried out in accordance with Guidance Note 3. How to carry out an insulation resistance test on a 2 way and intermediate lighting circuit
Students training aid for testing insulation resistance of a lighting circuit as pre Guidance Note 3. Full demonstration using a MFT Megger tester set on the Megaohms scale. How to prove all parts of the circuit has been tested by operating the 2 way switches and intermediate one at a time and repeating the test.
== 🕐 Time Stamps - Cut to the action 🕕 ==
00:00 - Insulation resistance test on a lighting circuit
00:41 - 500 volts DC
01:31 - 2 way and intermediate switching
02:10 - For AM2 and AM2S work from Guidance Note 3
03:02 - Disconnecting electronic components
03:49 - Earthing conductor must be connected
04:49 - 1 way switch is on
05:13 - 2 way and intermediate
06:41 - Setting up the Megger MFT tester
08:09 - Insulation resistance test 1
09:56 - Insulation resistance test 2 (operate the first 2 way switch)
11:54 - Insulation resistance test 3 (operate the intermediate switch)
12:48 - Insulation resistance test 4 (operate the second 2 way switch)
14:23 - Reconnect
14:56 - Learning summary
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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Awesome video as always , as a veteran of the armed forces and now a sparky for a few years, one thing I love about being a sparks is how we always as a collective strive to achieve standards across the entire electrical industry together and care about making sure everything including testing is carried out like gun drill so everyone’s on the same page and to a standard , and we are always keen to further our knowledge Keep up the good work
Thanks for another great video. I would like to mention that the terminology as required by C&G exams etc... is Megohms... (Meg-ohms)...and not Meggerohms or Megaohms as is often mentioned to by trainees. Picky, it may be, but at least you'll be pronouncing correctly to anyone in the know. So, once again I thank you for putting the measurements up on the screen in writing, for all to see.
I love seeing how much you electricians care about your customers safety and the quality of standards. Teaching out to the internet to try and ensure safe practices are adopted by all...
Thanks great video and great advice, will be sure to review the way I test the Two way lighting circuits in future 👍, love the over view of GN3. Hope more to come as would love to follow up my studies with an AM2s in the future
Nice one Gaz and Joe, super teaching. 👍
Thumbs up as always chaps!👍🏻
This videos has been some help, thanks!
Brilliant, thanks for such an in-depth, detailed video. It’s appreciated. 👍
Hi. Thanks for the lovely comment and watching Gaz👍
Love these videos. They help me so much.. 👍👍👍👍
Thanks for the support and watching Gaz 👍
Glad to hear it Archie, stay tuned for more!
Brilliant as always👍
Hi. Thanks for the support Gaz 👍
Thanks Gavin, appreciate the kind words.
Great video very good explanation
Well done Gaz and Joe, I think this may be your best video yet. Would love to see Matt back on our screen carrying out some on-site work.
Thanks for the continued support Gaz 👍
Very informative, yall explained in a way everyone would understand 👌
Great guys for sharing all your knowledge. Thanks
Thanks for the positive comment 👍🏻
Another blinding video again Gents. Chemistry is truly authentic. 👍🏾🙏
Many thanks 👍
Thanks Lincoln, stay tuned for more!
Excellent video and very helpful, thanks guys ++++
A great video
Thnks from Moroccan electrician
Your welcome 👍🦾
Fantastic, thanks for your help guys 👍
Thanks 👍🏻
Wow help now it AM2.... Legends
Great video
Thanks 👍
Thank you best video
nice vid
Smashing video guys
Thanks
Your amazing Gaz I wish I had you Teaching me 👍🏻
Thanks for the support and watching my videos. Gaz 👍
I was told that you have to do the test 5 times on an intermediate circuit as when you operate the 2nd switch, you're turning the circuit off. The same happens on the 4th test. So 5 tests turns the circuit on 3 times
Interesting. Wonder if I'll be able to do this myself.
Great video- quick question, and I’ll use an example... say this test was to be carried (e.i.c.r) out in a down stairs lighting circuit, and there was 2x rooms on that circuit with 10 or more fixed l.e.d downlight in each room- would it be acceptable to test the circuit on the 250v setting as it would take so long to disconnect 20+ Downlights? Or could you put it down as a limitation and not carry out the test for the e.i.c.r? What would be the best practice? TIA, John.
Great video guys as always, I find watching your videos really helps me refresh my memory while doing my level 2 domestic installers course. Quick question if you come across an garage installation for example where there's a number of sealed led 4ft fittings where the connections are behind boarding and not accessible I s it ok to be doing the installation resistants test at the reduced 250v.
garethf fox same question I had buddy. Watching for a reply. 😃
Hi guys brilliant video. Do you have any videos on other parts of the AM2 and AM2S as I’ve got mine of the 25th February? Keep up the good work
Hi. Sadly no direct videos but we will be working on some in the coming months. It’s only this year that team electrical has got the apprentices back (long story) hence little current content on AM2. Thanks for commenting and watching Gaz 👍
Thank u
What's the difference between the AM2 and AM2s. I done my AM2 last year and passed with flying colours thanks to your videos Gaz.
Hi. AM2s is about 18 months away from being rolled out but we think in the new one learners will install some of the containment. Thanks for the continued support Gaz 👍
GSH Electrical -indeed containment and there seems to be a new grading system where candidates will get marked- distinction, grade merit or pass respectively oh and fail obviously.
Loving the videos, just a quick question. On the other video you had the switches on in the CU, is that because you were isolated at the isolating switch and testing the whole board on initial verification? Cheers
Another awesome video. Just an idea could you do a video explaining how to get yourself noticed by an electrical company for an apprenticeship. That would help, thanks!
Hi. If we don’t do one in the next month message me again thanks Gaz 👍
No worries, and thanks 👍
Great Vid. When I did my AM2 last year, i had to physically disconnect the conductors from the terminals and connect directly to the conductors themselves. For my test centre, this was the preferred method. I did ask if I could test the whole 3~ installation but connecting to the bus-bar and completing the whole board, or switching individual circuits. The examiner said this is fine, but for this test, he preferred that we test individual circuits at a time.
Hi. Thanks for the feedback and watching 👍 all the best Gaz
It's all very good doing all of these tests, but how do you write it down on the form, in a way that makes sense ?
👍👍
What would you suggest if you were to do insulation on a school lighting circuit that have many lights with ballast and it would not be possible to remove every load? Thank you for your great videos
Thanks for commenting 👍🏻
Hi guys. I am following your channel for a while now and I must say it gives me a big help in passing my exams. Thank you so very much. I am preparing myself now for AM2 exam and this video is again huge help as the others. 🙏 However, I would like to ask you (if it's possible) for help in inspection and testing of S plan CH system. On which part of installation and how this inspection and testing has to be done?
Hi. Thanks for the wonderful comment. Sadly we have been planning heating systems and fault finding videos for sometime but currently with the pressures of teaching and our eFIXX website and KZhead channel these have been put on the back burner. More content coming but maybe not soon enough to help you this time. All the best 👍 Gaz
Hi Gaz. Thank you for your quick response. I understand completely what you are saying, and I wish you guys a great deal of luck and all power to your elbow! May I ask you as one of the schools which are providing training for electricians, why there is almost nothing about this topic in learning materials? This topic is part of AM2 exams, and there is something little about S plan wiring, but absolutely nothing about S plan inspection and testing and fault finding - why is that?
Is there a reason why you don't operate the switch to the left hand side of the ccu. I sit my trade test a week today so I'm trying to figure out every little detail before I go in.
Hi GSH lovely channel you guys have. Great to see the passion taken so far. Question though, it's off topic but is the RCBO required because of the lumaires in the circuit? I just arrived in the UK but back in sa lighting does not have rcd protection. Is this RCBO providing fault protection in this case
We use a main switch RCCB (RCD) for additional protection for this lighting circuit if the college had the money it would be an RCBO for best practice. Thanks for the support and commenting. Gaz 👍
@@GSHElectrical thanks Gaz👍we had nuisance tripping in sa so rcd on lighting was removed from the regulations. As well as having the hot water cylinder on rcd, that too was removed. Different strokes for different folks haha. Thanks again mate. I have subscribed :)
Would all combinations be tested if you did (live/neutral combined) to Earth?
That’s the preferred method Line and Neutral together to Earth and then between Line and Neutral 🙌. Thanks for commenting and watching Gaz
Hi Guys, just a quick question: If you walk out in to the installation do you need to apply any lockoff devices to the the breakers? Or do you just excercise your own judgement when you come back to the board. I'm loving the videos by the way. I'm not an electrician or in the industry but I am fascinated by the trade.
Hi. In our installation the main tails are not connected. If the installation was live and isolated at the main switch within the consumer unit then the cover would need replacing every time you walk away from it. Great question and thanks for commenting and watching Gaz 👍
Thanks Gaz. Hope you have a good week!!
Great vid. 🐵
How many prise and where it available in India.
Why don’t do you do live conductors together to earth on this video like you do on the other insulation resistance test on other video you do
Is it just both 2 way switches being operated off camera? Thanks :)
Test then operate first 2 way switch test again then operate the intermediate switch then test again then operate the last 2 way switch and test again. 👍🏻
They want you to check between CPC and neutral every time even though the intial CPC to neutral test would have covered any possible combination of switching as you're never going to be switching a neutral? What a waste of time. Good video either way.
What if the switches had neutrals in them and had been wired up wrong say as a strapper on one leg. 🤷🏼♂️
I also don't understand why signal tracers/TDR aren't used more in electrics. You would know paths and switching for sure with so much ease. Not necessarily worth it in this case but relevant in others.
Can you do continuity instead?
Continuity of CPC and Polarity of a 1 Way and a 2 Way and Intermediate Lighting Circuit (R1 + R2) kzhead.info/sun/jbWup8amsKqGlJE/bejne.html
Hi Apparently on the pre am2 I did, you have to disconnect the supply neutral because it’s a TNCS system is this true? Thanks
Thanks for that lovely up date and it makes total sense. All the best Gaz 👍
👍🏼👍🏼
For intermediate switching why do you have to repeat the test for each switch? Surely you only need to operate the two 'two way' switches at each end of the switch chain? From drawing it out there are effectively two parallel circuits between the two end points. Therefore for any amount of intermediate switches in a chain you only need to do 4 tests to garentee that all cables have been tested.
That seems right to me with the schematic in mind? Actually, only 3, but that’s marginal. On your first test, you test the line to switch one, and then one of each of the two runners, and maybe or maybe not the line to the fixture. If you then switch the last switch, you will add or remove (you don’t know) the line to the fixture. If you then switch the first switch, you switch to the other runner on both/all sets of runners, and then you actually already have all sets of cable done at least once. However… if you have an intermediate switch where one of the two positions breaks the connection onto one of the runners, and the other position *does* connect said runner, you could by accident have it in the position where it doesn’t connect, and then you fail to test both that runner and potentially the line to fixture. (I don’t know, do they deliberately introduce weird failures during exams?) So three tests are enough, *if* and only if you also know that all switches are fully functional (which you’d have to test both before and after), *and* you know which of the switches are two way and intermediate, and as long as the readings are significantly above minimum. If you get a near-breakdown of 25 on a runner and also 25 on the line to fixture, for instance, the three tests could potentially miss out the scenario where both of those are present and together would end up at 12.5. In the end, best practice and the sort of thing you’d want to show an examiner is probably still to do them all just in case.
Joe could easily be in a Peep show
100%
I don't get this thought process. Why don't you know that the two way switching is live or not based on switch position? I know sometimes people put their switches on up or down but that is also true of single switches. It's just binary. If you're smart enough to do testing you're smart enough to know which combination of switches turns a light on or not.
With 2 or more switches both up and down positions can be open or closed circuit
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