Do YOU Know What Happens to a Circuits Insulation Resistance When the Circuit Length is Increased? kzfaq.info/get/bejne/g9JpaLd31cnMnXU.html
@danielscullion372 Жыл бұрын
Hi GSH electrical, I'm currently studying a course online for electrical installation. I have to say I have learnt more from your videos then I have from reading from this course. Thank you for the brilliant videos 👍
@GSHElectrical Жыл бұрын
Thanks for the great message Daniel - tons more content coming this year good luck with your studying 👍🏻. Gaz
@vjaceslavprants62582 жыл бұрын
absolutely spot on, straight to the point, very clear explanation, head and shoulders above my 2391-52 course leader's explanation.
@GSHElectrical2 жыл бұрын
Massive thanks for the amazing comment 👍🏻. Gaz
@muhammedpatan84653 жыл бұрын
Thanks for your time to make our study much easier and understandable. Wish you all the best.
@GSHElectrical3 жыл бұрын
Thanks - working hard has its rewards 🦾. All the best Gaz
@Marcel_Germann5 жыл бұрын
The same way as we do it here in Germany. With the exception you'll have to test three lines, and test them against each other in addition. Three-phase power supply (3x230/400 VAC) is the standard here, even in residential buildings.
@londontrada5 жыл бұрын
Remember 500v dc is the maximum test voltage for a 230v installation. In reality 250v makes more sense, much less likely to damage sensitive equipment. I know it should be disconnected but in the real world its very easy to miss stuff.
@vikingofengland3 жыл бұрын
Very clear as always. I have just bought my self an IR tester for DIY electrical work I am doing (boo hiss!!!), and now I understand the procedure, cheers!
@davidroche69736 жыл бұрын
Hi GSH, thank you for the video. Very helpful method to allow the collection of the combined reading
@GSHElectrical6 жыл бұрын
+David Roche Thanks. Often missed in industry the testing of both live conductors together to earth. All the best and keep watching GSH Electrical
@N1ghtCrawler16 жыл бұрын
Is the old lead acceptable under GS38 as it has more of an exposed end?
@GSHElectrical6 жыл бұрын
+R P Hi. The insulation resistance test is the third DEAD test and GS38 applies to live testing probs. All the best and thanks for watching GSH Electrical
@TheDeathBonus5 жыл бұрын
Hi Gaz thanks for the excellent, clear and concise video on insulation testing. Please could you possibly do a video on board changing with tips and advice on getting it as neat as possible. Thanks.
@GSHElectrical5 жыл бұрын
Step by Step How to Connect up a 10 Way Wylex Dual RCD Consumers Unit (Fuse Box) By Luke Wichard kzfaq.info/get/bejne/qt9_nK9yutK3oIk.html This may help 👍. Thanks for watching and commenting. Gaz
@aroncells31202 жыл бұрын
Hi Gary great video again , Just a note maybe I find doing a lead check with the Megger with a short , set the voltage to s minimum is 250 v it save the battery's
@mosesdibela4491 Жыл бұрын
I enjoy all presentations more , I depend on them
@GSHElectrical Жыл бұрын
Thanks for the support and watching 👍🏻
@MrBobski135 жыл бұрын
Thank you for posting this video. Hopefully should help me to pass my AM2 next week! Liked and Subscribed!
@GSHElectrical5 жыл бұрын
Hi thanks. All the best with AM2 Gaz 👍
@bramcoteelectrical10884 жыл бұрын
Am2 is now Am2s the only difference is you now have to bend metal conduit
@caphaenaddiction6 ай бұрын
So easy on a test rig. Try it in a school or office block or factory floor with 150 luminaires connected and F.C.U.’s with neons multiple items of equipment out of reach or above false ceilings. There’s only so much you can put down as limitation.
@AlexK-bm3cr3 жыл бұрын
Great video.Great teaching skills.Appreciate your work mate.
@GSHElectrical3 жыл бұрын
Thanks 👍
@train49054 жыл бұрын
Dear sir a most brilliant tweek.keep up the great work and videos.thankyou loads.
@GSHElectrical4 жыл бұрын
Thanks for the support and watching. Gaz 👍
@NursaryOfGoodThoughts6 жыл бұрын
Really helpful. Appreciate the efforts put in to share this knowledge. Keep doing the good things.
@GSHElectrical6 жыл бұрын
Hi. Thanks for commenting and watching 👍.
@chrissmith72593 жыл бұрын
This video has been some help.
@zadvindersingh42345 жыл бұрын
Thanks for improving knowledge
@AhmedMohammadali-pn3udАй бұрын
Thank you very helpful
@GSHElectricalАй бұрын
Thanks
@electricalservicesmaroc3 жыл бұрын
Hi GSH, thank you for the video. Very helpful
@bramcoteelectrical10884 жыл бұрын
Been a spark for ages this is good time saving idea. Bit like a gobal test but good time saving idea
@nelgchannel9661 Жыл бұрын
Well done, Thank you
@GSHElectrical Жыл бұрын
Thanks for watching and the great comment 👍🏻
@alanmarriott9216Ай бұрын
What about when there’s loads of lights are connected and you haven’t time to disconnect all of them when you need to test between L-N? Not possible to do is it?
@huzaifahsamoon89663 жыл бұрын
Your lessons are really helpful
@NickToland2 жыл бұрын
Top class!
@GSHElectrical2 жыл бұрын
Thanks
@rossmurdoch78704 жыл бұрын
Liked the wee crock link Gary
@GSHElectrical4 жыл бұрын
Thanks 👍👍
@liammcgeehotmail2 жыл бұрын
I have 2 neutral wires burned at the busbar . My electrician installed the panel 15 years ago and it is only now I noticed as I was installing a new MCB for a Camera system ..... Yes yes I know I'm not supposed to be in there if I'm not qualified before all the spark heads start slatting me ! I have fair knowledge of electrical circuits and would only work at something that I'm confident in installing and straightforward. Each MCB is independent and don't have any shared neutrals. I did check the neutrals for a loose connection as arcing was my first thought. They seem all good but the busbar itself is slightly corroded .. the screws being the worst . I have now installed a new wire and bent the ends for better contact ( Original sparky had the two neutrals in one screw , not sure if that makes a difference ) Could slight corrosion cause this and if so why did the rest of them not do this ? The wire is 1.5 mm solid, Goes to the first led light and onto the next 7 lights at a distance of 30 metres ( 60 watt each ) Again I'm not a sparky ! If I have to pay for someone I will but I like learning the cause and solution of such problems !
@matthewpaling78162 жыл бұрын
Great video 👍
@GSHElectrical2 жыл бұрын
Thanks for watching 👍🏻
@Jamal_Tyrone6 жыл бұрын
Surely, if you do the test this way a dead short in either the earth or neutral will be impossible to find. Doing it the way we were taught way back in college allows you to split your results to find insulation resistance failure in 2 potentially faulty conductors out of 3.
@GSHElectrical6 жыл бұрын
Hi. The test paperwork for the IET has only two boxes for recording installation resistance between live conductors and live conductors to earth hence the video. These videos are designed to provoke discussions within my classroom as it has with you. The readings can still be carried out as you have stated but the installation resistance test between live conductors together to Earth is required to be measures and recorded according to the IET model forms. This reading will not necessarily be the same as the individual tests you have stated as you will have two parallel conductors line and neutral tested to Earth in my example the measurement if often less than L/E N/E tests. If L/E was 4M ohms and N/E was 4M ohms live conductors to earth would be 2M ohms. Thanks for watching and commenting GSH Electrical.
@GSHElectrical6 жыл бұрын
Hi. You would find the neutral earth fault when testing between live conductors (L/N) together to earth. Then the circuit would be spit down for find the faulty (low resistance) circuit(s). Thanks again GSH Electrical
@ashkeldon364 жыл бұрын
Great videos !!, best on you tube by far. Where can i get the short crocs leads you use for shorting out the the test probes?
@risurii12995 жыл бұрын
Thanks this is really help full!
@handwoundpickups65553 жыл бұрын
Great video thanks
@GSHElectrical3 жыл бұрын
Thanks for commenting 👍
@SmartCables Жыл бұрын
HI GSH, Just a question - you mention the removal of sensitive electronics. If we were at a stage where a cooker had been weird into the cooker switch would we need to remove this before the test? or would we do the test with the switch turned off?
@GSHElectrical Жыл бұрын
Ideally you would remove the load and have the switch ON so you test the full length of the cable in circuit 👍🏻. Gaz
@GSHElectrical Жыл бұрын
Ideally you would remove the load and have the switch ON so you test the full length of the cable in circuit 👍🏻. Gaz
@pauljohncross6 жыл бұрын
Great video. Would you be able to explain the best way to test both individual circuits and the whole installation where there are ONLY single pole RCBOs (neutral fly-lead, no earth fly-lead) installed where the manufacturers instructions state that "all connections to the device must be removed prior to conducting insulation resistance tests".
@GSHElectrical6 жыл бұрын
Hi. Thanks for the great massage I will add your video request to my list 👍 all the best GSH Electrical
@robthwaite68194 жыл бұрын
Easy on a test board, how about showing us how to do it with 50+ led fixed lights, neon FCU and inaccessible white goods etc.
@Jay3693 жыл бұрын
To do the tests at maximum efficiency you would disconnect all led lights. (Either live or neutral at each light and join them in a connector), remove all lamps from other lights. As for the white goods, pull the machines out and disconnect, any neons have to be removed from the circuit (disconnect switch spur and join cables to complete circuit to the end of line etc etc) Theres no quick fix. Painstaking: Yes Time consuming: Yes Always possible: No Bill accordingly: Most definitely You sign your name to something, you better be sure you've covered your ass.
@duckman56423 жыл бұрын
Put something down in the limitations 😂. Real world. No like in this video 👍
@digitaria3 жыл бұрын
Then charge £80 for the EICR
@jorgebentley95832 жыл бұрын
It’s for college students lad
@jayAsparks Жыл бұрын
@@Jay369😊
@FixItWithJon Жыл бұрын
Hi, great video, thank you for sharing 🙏 If there are fused spurs, should the appliance (eg washing machine) be disconnected before applying test or should the spur switch be switched off or fuse removed?
@seankerr46493 жыл бұрын
Hi there, only just watched this video now as I have my AM2 in 2 weeks time, would they say anything if I was to do the same with the crocodile clip whilst testing? Doesn’t seem right 🤣great way of testing tho! Makes things so much easier! Really helping me these videos!
@go16663 жыл бұрын
How’d u get on with your AM2 mate and u got any tips? Got mine sometime this year not to sure wen tho cos of COVID lol
@RFB19886 жыл бұрын
Thank you.
@Mark-ij2nh3 ай бұрын
I was taught in college to test each wire of the live to mcb and just clamp.it to the neutral bar without a strapper then the earth to neutral and then the earth to live. What's the difference now ? Is it because of split boards?
@skiv366 жыл бұрын
Nice GS38 probe
@markbruce81452 жыл бұрын
I get the unplug and leave switched on etc but what about fused spurs. Ie say a washing machine. What do I need to do for them. Leave switches off or pull fuse or take front off and physical disconnect.
@TuanDo-im1ex2 жыл бұрын
Thank you for the video. Very clear instructions. Just wondering if i do IR testing in real house for c20 power circuit. Do i have to unplug all the equipment for that circuit inside the house in order to do Ir testing 500v? Wouldn’t it be too much time? Any quick way you can suggest would be great? Thank you
@sparky56755 жыл бұрын
Great video, very informative and helpful. If you are testing a normal house say and the lighting downstairs is one circuit ,do you remove every downlight lamp from the fitting in order to get a true reading?
@GSHElectrical5 жыл бұрын
Hi you should do however on an EICR often the insulation resistance isn’t carry out between Line and Neutral as all loads cannot be removed. On a new installation the loads wouldn’t be fitted so this test can be carried out. Thanks for commenting and watching. Gaz
@MrSJT4 жыл бұрын
Hi Gaz, you said the minimum resistance of the whole installation must be at least 1Megohm, if less than 2Megohm should be further investigated. Correct me if I'm wrong but the latter, shouldn't that be any circuit that is less than 2Megohm should be investigated rather than the whole installation that is less than 2megohms?
@GSHElectrical4 жыл бұрын
Steve Tang agreed. Thanks for the message. Gaz
@bramcoteelectrical10884 жыл бұрын
Alot of low readings are due to lead cable or water on conductors or a common one is forgetting to take lamps out lol done that....
@Johamo9 ай бұрын
What would be your solution when testing a 40-circuit panel feeding to various lighting and power branch circuits with dimmers, bulbs, smoke detectors, etc on the branch circuit? It can't be reasonable to hunt through the entire building looking for these devices to connect.
@omarcaruana2 жыл бұрын
Hi, I have a question about insulation resistance on ring circuuts since the focus is mostly done on radial circuits. When carrying out the insulation resistance test on a ring circuut, shall one test on only one end of the L and N cables? Or can one link the LL and NN and test across them? Thanks again
@feet574 ай бұрын
for lighting circuit do I need to remove strip lamps or lower the voltage ?
@rauljr.montesclaros22305 жыл бұрын
Great video. Very informative. Just a quick question. How do you perform the IR test on a circuit which has lighting loads connected to it.? Is there a way to still conduct the test? I watched some vids and they said that testing the insulation by linking the neutral and line to earth is the way to do it.
@bramcoteelectrical10884 жыл бұрын
Yes link live and netrual linked to earth sometimes you just cant get access because of having to get up high to the lights and access etc. Note on certifcate that you only tested L/N TO CPC On a new fresh install you would do a full test but on a periodic tou would only do the above unless client said different then you would agree that and charge accordingly !!!
@459HAMED2 жыл бұрын
@@bramcoteelectrical1088 would you then leave L-L test blank on the certificate
@grhevans5 жыл бұрын
GS38 says 4mm max probe length - Monday's session. I'm pretty sure the "older probe" is more than 4mm...
@GSHElectrical5 жыл бұрын
Hi. Max 4mm preferably 2mm preferably spring loaded as stated in GS 38 👍. Gaz
@nathanclaxton53455 жыл бұрын
Insulation resistance testing is a dead test (below the 50v limitation complying to GS38) so in this test you do not need to comply.
@seanmac23845 жыл бұрын
Nathan Claxton it actually states used to measure or deliver voltages over 50vac or 100vdc and in this case, your delivering a voltage of 500vdc so they need to apply
@DstandsforDoomed4 жыл бұрын
There’s always one wise ass know it all. Shut up @Gareth Evans
@MrSJT4 жыл бұрын
@@seanmac2384 you are correct coz it can still cause an involuntary movement from the shock of the testers 250v+ voltages
@gh0510 Жыл бұрын
Why do you connect Live and Neutral together???!! Isn't, 1. Live to Neutral, 2. Live to Earth, 3. Earth to Neutral, Enough for insulation resistance???
@GSHElectrical Жыл бұрын
This video may help 👍🏻 Do YOU Know What Happens to a Circuits Insulation Resistance When the Circuit Length is Increased? kzfaq.info/get/bejne/g9JpaLd31cnMnXU.html
@ko46584ko Жыл бұрын
Hi. Instead of that crocodile clip. Cant U just use 3rd neutral cable? Coming out from meeger tester? I
@adepttube23645 жыл бұрын
the mega meter was readfing 999 but on the result sheet you wrote +299 ?
@bramcoteelectrical10884 жыл бұрын
Depends on megger but yes if meeger tests to 999 you put greater than >999 If it's the older style megger you put >299
@linksone62876 жыл бұрын
Hi Gaz. Loving the video. 5 star mate. However, do we need to remove all load/components. I.e. washing machine, cooker etc? Or just lamps and infrareds? Links
@gedman95275 жыл бұрын
Do you have to remove. Loads. Like washers cookers
@HandyKindaGuyUK5 жыл бұрын
Of course, otherwise you'll be pushing insulation testing current directly into the appliance
@bramcoteelectrical10884 жыл бұрын
All loads if you cant do that then put a limitation and state your minky tested Live + Netrual to cpc (earth)
@mrrooneygeorgee65243 жыл бұрын
Hi gsh, thanks for the awesome video. Let’s say you can’t take out all the loads of a lighting circuit but you want to still see if IR integrity is lost between live conductors. Do you short active and neutral together and go between the pair to earth? Thanks.
@GSHElectrical3 жыл бұрын
Thanks for the kind words... yes you can 🦾. Gaz
@mrrooneygeorgee65243 жыл бұрын
@@GSHElectrical legend 💪🏻
@notthedroneyouarelookingfo74583 жыл бұрын
@@GSHElectrical I don't understand - if you short Line & Neutral together and test to Earth, how does that prove IR integrity between the Live conductors? You've shorted them together!
@digitaria3 жыл бұрын
That is why I don't do that one I simply can't see the sense.
@Robert-ts2ef3 жыл бұрын
Can I ask a couple of questions: 1. What if you have an installation with load of down lights, do you have to get step ladders and remove them all for the test? 2. One thing that I am confused by, is that, if the main neutral is ultimately connected to earth back at the supply transformer, why would you not get a zero or close to zero reading when you measure between neutral and earth in the consumer unit if you were making three tests rather than the combined neutral and live to earth test? Just for my understanding. Thanks.
@MrImATarget3 жыл бұрын
The main switch is locked in the off position so the neutral will not be making a connection to the earth unless there is a fault in the system which is what you are testing for.
@nothitler87494 жыл бұрын
Excellent vid, what was the need to repeat the test for the 2 way switches??
@bramcoteelectrical10884 жыл бұрын
To test the strappers in the 2way circuit As at the time of test you would only be testing the common and say L1 By flicking the switch your testing Common and L2 etc
@djelectricals344 жыл бұрын
nice sir
@salehfarman90542 жыл бұрын
Do we have to considered the resistance of the Test Lead, while doing IR or Earth Test or even Soil Resistance Test? Thereafter minus resistance of the Test Lead in order to get the accurate test results?
@MsTommyknocker3 жыл бұрын
Hello. Thank you for the upload. On the eurotester, you use four probes that are short circuited into an "octopus", why is that not the case here?
@andrewFJ3 жыл бұрын
Thank you very much for this informative video, can you please help to find an example of this table shown in 2.20. I really wonder how such an installation report looks like in full.
@amitmallick93315 жыл бұрын
Thanks GSH Sir,very helpful video,how much price insulation tester.
@GSHElectrical5 жыл бұрын
Hi. They range in price but about £600-800 thanks for watching Gaz
@amitmallick93315 жыл бұрын
Sir i am INDIAN ,wher are you from☺
@SmartCables Жыл бұрын
Hi Gaz, just one more question - if you was to test an old installation for insulation resistance and it was below the minimum 1megaOhm what would be the action to take?
@GSHElectrical Жыл бұрын
Further investigation. Breakdown the circuits and try and find the part(s) if the installation that are brewing down the readings Also an interesting video 👇🏻 kzfaq.info/get/bejne/g9JpaLd31cnMnXU.html
@SmartCables Жыл бұрын
@@GSHElectrical Thank you very much - That other video was definitely worth the watch!!
@lukeporter15612 жыл бұрын
Do you have to test every cable at every point in the circuit you are testing, or just at the distribution board?
@zamanraja95312 жыл бұрын
Can you please please help. I know sensitive circuits need to be tested at 250v. Would you say you do insulation resistance at 250v for garden sensors , cooker circuits, smoke alarms etc ?
@didafm5 жыл бұрын
Im an electrician in canada and we never do this kind of testing
@GSHElectrical5 жыл бұрын
Thanks for commenting and watching GSH Electrical 👍
@carlmarquardt9945 жыл бұрын
Same in Oz. Nothing like this. I have been in the UK seven years now. Gaz. Why do u have to move the Clip in the neutral bar when u tested the next circuit?? It's not a knock at all just wondering since the entire neutral terminal is one unit electrically speaking so any where on there would yield the same reading. Also does your college do test n inspection courses for àn installation sparky who wants to upgrade?? Ta
@marktownsend19824 жыл бұрын
@@carlmarquardt994 Because the RCD's are in the off position thus isolating the two neutral bars on the left from the main one.
@pz3204 жыл бұрын
@@carlmarquardt994 the neutral bar is split into 3 separate blocks if u look closer
@robjackson13194 жыл бұрын
carl marquardt This particular unit has 3 segregated neutral bars to achieve separation of circuits. Integrity. The individual circuit neutrals from the 3 split positions are electrically isolated.
@michaelryan2034 Жыл бұрын
Hi, How can you get IR on the DB supply cable from supplh meter if its live and cannot be isolated?
@bernardcharlesworth98602 жыл бұрын
Does not work with pme. Disconnect earth from met?
@heron95246 ай бұрын
But this test does not detect a fault between line and neutral!!
@IIxVENDETTAx Жыл бұрын
If you have an MEN link between neutral and earth do you have to remove that before you run these tests
@daletilley68134 жыл бұрын
So performing an IR test this way is acceptable if rcbo's are present?
@bramcoteelectrical10884 жыл бұрын
Guidance note 3 states tou need to do a gobal test. I failed my am2 as I didnt do a gobal test I was testing individually lol. Passed on 2nd try many moons ago .
@daletilley68134 жыл бұрын
@@bramcoteelectrical1088 yeah true although for circuits protected by sensitive devices you can do an individual IR test or link them out to complete a global test
@missdee8939 Жыл бұрын
😊
@lupascualexandru14833 жыл бұрын
If we leave something plug in into socket when testing is in progress, the test results will be the same ? Or will be something wrong with the results?
@abdulseaforth69305 жыл бұрын
So Gary, for EICRs I got into the habit of doing the test of Lines-Earth only siting my reasons. According to BS 7671 I’m supposed to fulfil both tests, the other one being Line-Line. My question is, do I have to remove all those lamps in the downlight fittings? Which is what I’ll have to do. I’m not asking the question in a negative way as I am in a pursuit of excellence, hence the reason why I watch your videos.
@GSHElectrical5 жыл бұрын
Hi. BS7671 test results page only has 2 boxes for insulation resistance testing Live/Earth and Live/Live remember live conductors are line and neutral. Napit and NIC test paperwork have 3 boxes. On an EICR you possibly won’t be able to remove all loads so a test between Live conductors cannot be carried out. Thanks for commenting and watching Gaz 👍
@abdulseaforth69305 жыл бұрын
GSH Electrical You’re on point. I actually fill out the NIC forms and haven’t looked at a BS7671 model form for an age. Having had a thought, by testing first off, Live-Live, and that being satisfactory then testing afterwards Lives-Earth and that too being satisfactory you need not test, Live-Earth and Neutral-Earth. I noticed too on the BS7671 model form that the field for the amount of points is not present. Again, you see, I’ve only been filling out the NIC forms. Question: For insulation resistance testing, what are you NOT testing when leaving the switch(es) of a socket, in the ‘off’ position?
@MrSJT4 жыл бұрын
@@abdulseaforth6930 if you leave sockets switched off you will not be testing the end contacts of the socket points hence you must leave it on
@michaelcostello69912 жыл бұрын
When you test between live and neutral you have other neutral wires also connected to the bar. How is this ok ?
@michaelcostello69912 жыл бұрын
Does every installation have a double pole isolation switch for doing the IR test ?
@mahfuzalam10724 жыл бұрын
Please electrical dead test in hindi
@MATHEUS-wr4hm5 жыл бұрын
Great explanation!! Quick question. How do you do an insulation resistance test when impractical to remove all lamps, sensors, electronic equipment ? Is it allow to perform the test only between L-E , N-E?
@GSHElectrical5 жыл бұрын
Hi. Test with Line and Neutral together to Earth... if you cannot remove the loads never test between Line and Neutral👍. Thanks for commenting and watching Gaz
@MATHEUS-wr4hm5 жыл бұрын
@@GSHElectrical Thank you very much for your prompt answer. Best regards
@joshstrom27914 жыл бұрын
just test at 250
@Chris-uu6dg3 жыл бұрын
@@GSHElectrical Hi, if you are testing Line and Neutral together to Earth does that mean the 500v DC current is not going through any loads and bypasses it and goes out through the Earth cable? If you have for example fixed downlights connected on the lighting circuit does the 500 volts not passthrough the lamp? Best regards and thanks.
@RedUtopia2 жыл бұрын
@@joshstrom2791 so if I get
@iraqviva76703 жыл бұрын
How we can test a ring circuit for insulation resistance
@GSHElectrical3 жыл бұрын
The same way you do any other final circuit 👍
@faithful54753 жыл бұрын
What if you have led intergrate lights which you cant remove? How to perform test
@GSHElectrical3 жыл бұрын
Test between line and neutral together to Earth (only) 👍
@smacznykonsek4 жыл бұрын
On the lighting circuit containing two way or two way and intermediate switches would you not need to operate switches *one at a time* as it states in GN3?
@@GSHElectrical Thank you for your response and for the link! I must have watched this one very recently as I am currently revising for my AM2 exam tomorrow. I wanted to add my thought on the topic of the discussion that you are provoking on this video regarding the two boxes for IR on schedule of test results form. Looking at IR testsing of three-phase 4-core power cable guidance in GN3, table 2.3 says that the lowest value obtained from tests between live conductors (Test 1 to 4) is recorded as 'between live conductors' and for Test 5 and 6 again the lowest value of these tests is recorded as 'between live conductors and earth'. Maybe the same principle can be then applied to single phase circuits where the lowest value from testing L to E and N to E would be recorded as 'between live conductor and earth'? And then any reading below 20 mega ohms would be investigated as required. Just my thoughts! And yes, all of your videos I watched so far have been great help!
@smacznykonsek4 жыл бұрын
@@GSHElectrical I stand corrected. Even at the beginning of this video presentation you mention that light switches were left in "on" position ;) On a side note, I was thinking about it now and concluded that with two way or two way and intermediate switches (no matter how many) with any connection method for those we only really need to operate the first switch (nearest to the supply) and perform two tests - in that way we will have both strapper "sets" tested including the switch line going all the way to the load. Please correct me if I am wrong? And, again, this is just me sharing my thoughts.
@filywedibereka1961 Жыл бұрын
Easy like drink water, thanks, though
@travelwithmems282 жыл бұрын
What is the main reason for this test
@GSHElectrical2 жыл бұрын
To check the conductor insulation isn’t breaking down 👍🏻
@bengimanbrixton Жыл бұрын
this wouldn't work on rcbos, they would throw out the readings as would certain mcbs. also if you have a neutral to earth fault on any of the combined readings that would be your reading.
@GSHElectrical Жыл бұрын
Bring on more RCBOs with switched neutrals
@roystevenson1375 Жыл бұрын
@@GSHElectrical I actually came across some last year...I can't remember the brand but I think they were just around £16 a pop
@mrhaydon6 жыл бұрын
Would you only carry out the L+N to E test if there are loads connected. For example, an EICR where it's impractical to remove loads. L to N would cause damage to sensitive equipment right?
@GSHElectrical6 жыл бұрын
Hi. Thats correct. Thanks for the question GSH Electrical 👍
@GSHElectrical6 жыл бұрын
Hi. However the paperwork in BS7671 only has 2 boxes for insulation resistance and this was a video showing away of doing the combined test L/N to E for an initial inspection. Thanks again GSH
@owusuaikins3522 жыл бұрын
Hi
@sbmorris2k66 жыл бұрын
Can you still carry this test out if using only rcbo's? Also on the test form you talk about live - live and live - earth (being l+n+e) so would you write down the result for l+n+e in both boxes ? Thanks
@GSHElectrical6 жыл бұрын
Hi. Only ever write down results of tests you carryout as you are signing the paperwork.
@tconners17585 жыл бұрын
Hi, Can you explain how to do an IR test from somewhere other than the CCU. Like, when the ring final circuit is being split, how you test at the "halfway" point to confirm which side has the lower reading? Also, can it be done at ceiling roses/switches etc
@GSHElectrical5 жыл бұрын
Hi. Breaking circuits down is an essential part of fault finding. In your case to discover a section of a circuit with a low IR 👍. Thanks for commenting and watching GSH Electrical
@tconners17585 жыл бұрын
@@GSHElectrical Definitely. How would you complete an IR test at a socket though? Just test on the wires once removed from the socket outlet?
@yoyoyotooo2 жыл бұрын
Are these probes not against the regs
@GSHElectrical2 жыл бұрын
It’s not a live test… no requirements for GS38 probes during dead testing👍🏻
@randomj61885 жыл бұрын
Hi Gaz If you're doing an initial verification, would you need to bother testing with Line and Neutral connected together or is that more for if you're testing an older installation and its impractical to remove every single bit of kit throughout the house? Thanks in advance
@GSHElectrical5 жыл бұрын
Hi. The video was to provoke the debate as BS7671 only has 2 boxes for installation resistance 🤔. Thanks for commenting Gaz
@ningis216 жыл бұрын
Hi Gaz.... Could your method ( using the link wire) be used with RCBO's? I ask because of the neutral connection through the RCBO.
@GSHElectrical6 жыл бұрын
Hi. Great question. Sitting drinks wine I think you are correct... remember to have the RCBO in the off position (electronic device). Thanks for watching GSH Electrical
@salehfarman38795 жыл бұрын
What is the duration for Insulation Resistance Test. In some places where i worked, the IR Test was carried with a duration of 1 min for each circuit base on the length. Correct me if i am wrong. Thx
@bramcoteelectrical10884 жыл бұрын
Test until meter stable readings
@gd-bq7em5 жыл бұрын
I was just looking at that second board how would you run say a garage board. Would you connect it into the main board or use those Henley connection blocks inbetween the main income terminals
@londontrada5 жыл бұрын
Will depend how you design the distribution circuit.
@roystevenson1375 Жыл бұрын
4 years later......Henley block to Isolator near main DB....or connect into main board..up to you.Depends if there is room or not
@sampenfold23006 жыл бұрын
How would you test all live conductors to earth on a three phase installation using your method?
@GSHElectrical6 жыл бұрын
Hi great question. Ideally you would be linking at the disconnect tails as shown in many testing text books (as if you can do that when the supply is connected). I came up with this solution for a single phase installation as I was constantly ask by learners how to over come this issue. I will have a think but industry gives no guidance have you got a solution.?
@DerekHundik3 жыл бұрын
test on OK instalation as an exampele has no point really It should be faulty one to point what the problem could be.
@000hugohew6 жыл бұрын
when the insulation resistance values measured between the neutral terminal and the earth terminal at a consumer unit are below 0.5 Mega Ohm. How do safety precaution to do the troubleshooting?
@GSHElectrical6 жыл бұрын
Hi. You need to break the circuits down and test them individually to find the circuit(s) causing the overall insulation resistance to be blow 2Mohms. Then investigate that circuit(s)... thanks for commenting and watching GSH Electrical
@000hugohew6 жыл бұрын
GSH Electrical thank you 😊
@abrahamshavuka70644 жыл бұрын
Hi .what values you got from the test and the values should be at least how many Megaohms?
@michaelthompson2573 Жыл бұрын
Greater than 1Mohm
@huzaifahsamoon89663 жыл бұрын
Which brand is the IR tester? I need one like that.
@mwbg2 жыл бұрын
Meggar
@sibusisokhanyile30683 жыл бұрын
Which Megger did you use?
@GSHElectrical3 жыл бұрын
1711 thanks. Gaz 🦾
@sibusisokhanyile30683 жыл бұрын
Keep doing these videos there are very helpful
@nejendary11 ай бұрын
poor you man, you know, this is probably gonna be deleted because im afraid of people aand my accounts getting with people other people or people that know other people just people of people, man, your bak cracks me up in a bad way my guy blad pleaase give this man more likes for the crimes that are commoiteed it is important to superseeeeed pain its a crime is my point sir this pain on your back shall be it gone midst summer like the heat wave that has hit us recently shall it come strong come strong and leave your life little prayer there hit me up not in the fce change nejendary 1$? anybody clap yourhands
@ashsmith30256 жыл бұрын
Are you suggesting that by testing live conductors to earth individually as opposed to combined is wrong???
@GSHElectrical6 жыл бұрын
Hi. Great question. The insulation resistance test of live conductors (L and N) together to earth will give an overall insulation resistance lower than the individual L/E and N/E. The model forms for BS7671 only have two boxes for single phase insulation resistance. Hope this helps (currently shopping with the wife). Thanks GSH Electrical
@GSHElectrical6 жыл бұрын
If you had 5 Mohms L/E and 10 Mohms N/E which one would you record... because if you tested live conductors together to earth would get a reading less than 5 Mohms...
@ashsmith30256 жыл бұрын
Appreciate the reply GSK. Surely by testing between live conductors to earth combined or individually though is preference. After all if a result above 1M was found combined the next steps would be to then split them and test separately. I get for a periodic etc then combined or at 250v due to loads. Just seems like your stating it's WRONG. Am I missing something??
@ashsmith30256 жыл бұрын
Sorry less than
@GSHElectrical6 жыл бұрын
Testing between live conductors to earth will always give you a lower reading than L/E and N/E. BS7671 paperwork requires the results for between live conductors and live conductors to earth to be recorded. I understand that LIM’s will be applicable on periodic inspections. All the best GSH Electrical