Do YOU Know What Happens to a Circuits Insulation Resistance When the Circuit Length is Increased? kzbin.info/www/bejne/g52cZod8pcibo6M
@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
@vjaceslavprants62583 жыл бұрын
absolutely spot on, straight to the point, very clear explanation, head and shoulders above my 2391-52 course leader's explanation.
@GSHElectrical3 жыл бұрын
Massive thanks for the amazing comment 👍🏻. Gaz
@heiltd1286Ай бұрын
Amazing and amusing comment.
@danielscullion3722 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 👍
@GSHElectrical2 жыл бұрын
Thanks for the great message Daniel - tons more content coming this year good luck with your studying 👍🏻. Gaz
@AlexK-bm3cr4 жыл бұрын
Great video.Great teaching skills.Appreciate your work mate.
@GSHElectrical4 жыл бұрын
Thanks 👍
@davidroche69737 жыл бұрын
Hi GSH, thank you for the video. Very helpful method to allow the collection of the combined reading
@GSHElectrical7 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
@N1ghtCrawler17 жыл бұрын
Is the old lead acceptable under GS38 as it has more of an exposed end?
@GSHElectrical7 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
@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.
@train49055 жыл бұрын
Dear sir a most brilliant tweek.keep up the great work and videos.thankyou loads.
@GSHElectrical5 жыл бұрын
Thanks for the support and watching. Gaz 👍
@MrBobski136 жыл бұрын
Thank you for posting this video. Hopefully should help me to pass my AM2 next week! Liked and Subscribed!
@GSHElectrical6 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
@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 👍.
@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 kzbin.info/www/bejne/qqqymn93itGGprc This may help 👍. Thanks for watching and commenting. Gaz
@electricalservicesmaroc3 жыл бұрын
Hi GSH, thank you for the video. Very helpful
@cipriangrosu9077Ай бұрын
Hi, not sure i understand if the breakers needs to be on or off position. Guidance note 3 is saying needs to be on . Could you explain me this please?
@londontrada6 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.
@mosesdibela44912 жыл бұрын
I enjoy all presentations more , I depend on them
@GSHElectrical2 жыл бұрын
Thanks for the support and watching 👍🏻
@zadvindersingh42345 жыл бұрын
Thanks for improving knowledge
@vikingofengland4 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!
@bernardcharlesworth98603 жыл бұрын
Does not work with pme. Disconnect earth from met?
@caphaenaddiction11 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.
@NicoleBritnell3 ай бұрын
How can you do it if you don't have an old probe that you can get a link on? Would you have to remove the line conductor and connect it into the neutral bar?
@aroncells31203 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
@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.
@alanmarriott92166 ай 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?
@Mark-ij2nh8 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?
@bramcoteelectrical10884 жыл бұрын
Been a spark for ages this is good time saving idea. Bit like a gobal test but good time saving idea
@Johamo Жыл 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.
@michaelryan20342 жыл бұрын
Hi, How can you get IR on the DB supply cable from supplh meter if its live and cannot be isolated?
@huzaifahsamoon89663 жыл бұрын
Your lessons are really helpful
@feet579 ай бұрын
for lighting circuit do I need to remove strip lamps or lower the voltage ?
@chrissmith72594 жыл бұрын
This video has been some help.
@nelgchannel96612 жыл бұрын
Well done, Thank you
@GSHElectrical2 жыл бұрын
Thanks for watching and the great comment 👍🏻
@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?
@ko46584ko2 жыл бұрын
Hi. Instead of that crocodile clip. Cant U just use 3rd neutral cable? Coming out from meeger tester? I
@zamanraja95313 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 ?
@IIxVENDETTAx Жыл бұрын
If you have an MEN link between neutral and earth do you have to remove that before you run these tests
@michaelcostello69913 жыл бұрын
When you test between live and neutral you have other neutral wires also connected to the bar. How is this ok ?
@CozyHomeTech2 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?
@GSHElectrical2 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
@GSHElectrical2 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
@matthewpaling78163 жыл бұрын
Great video 👍
@GSHElectrical3 жыл бұрын
Thanks for watching 👍🏻
@MaxEpsom4 жыл бұрын
How we can test a ring circuit for insulation resistance
@GSHElectrical4 жыл бұрын
The same way you do any other final circuit 👍
@faithful54754 жыл бұрын
What if you have led intergrate lights which you cant remove? How to perform test
@GSHElectrical4 жыл бұрын
Test between line and neutral together to Earth (only) 👍
@salehfarman90543 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?
@NickToland3 жыл бұрын
Top class!
@GSHElectrical3 жыл бұрын
Thanks
@risurii12996 жыл бұрын
Thanks this is really help full!
@michaelcostello69913 жыл бұрын
Does every installation have a double pole isolation switch for doing the IR test ?
@handwoundpickups65553 жыл бұрын
Great video thanks
@GSHElectrical3 жыл бұрын
Thanks for commenting 👍
@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
@AhmedMohammadali-pn3ud6 ай бұрын
Thank you very helpful
@GSHElectrical6 ай бұрын
Thanks
@CozyHomeTech 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 👇🏻 kzbin.info/www/bejne/g52cZod8pcibo6M
@CozyHomeTech Жыл бұрын
@@GSHElectrical Thank you very much - That other video was definitely worth the watch!!
@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?
@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? kzbin.info/www/bejne/g52cZod8pcibo6M
@daletilley68135 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
@travelwithmems282 жыл бұрын
What is the main reason for this test
@GSHElectrical2 жыл бұрын
To check the conductor insulation isn’t breaking down 👍🏻
@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 😊
@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.
@gd-bq7em6 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
@londontrada6 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
@omarcaruana3 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
@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?
@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.
@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.
@Jay3694 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.
@duckman56424 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😊
@yoyoyotooo3 жыл бұрын
Are these probes not against the regs
@GSHElectrical3 жыл бұрын
It’s not a live test… no requirements for GS38 probes during dead testing👍🏻
@rondj19656 жыл бұрын
It requires a 'comboined' test? 2:36
@GSHElectrical6 жыл бұрын
Hi. The schedule of test results in BS7671 only has two boxes for insulation resistance between live conductors and live conductors to earth. I did the video to show away that could be used to link live conductors and then test to earth. I couldn’t find any guidance on how this test could be preformed other than testing from the tails (not possible). All the best and thanks for watching GSH Electrical
@tconners17586 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
@GSHElectrical6 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
@tconners17586 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?
@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
@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....
@RFB19886 жыл бұрын
Thank you.
@mrrooneygeorgee65244 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.
@GSHElectrical4 жыл бұрын
Thanks for the kind words... yes you can 🦾. Gaz
@mrrooneygeorgee65244 жыл бұрын
@@GSHElectrical legend 💪🏻
@notthedroneyouarelookingfo74584 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.
@lukeporter15613 жыл бұрын
Do you have to test every cable at every point in the circuit you are testing, or just at the distribution board?
@MsTommyknocker4 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?
@huzaifahsamoon89663 жыл бұрын
Which brand is the IR tester? I need one like that.
@mwbg3 жыл бұрын
Meggar
@seankerr46494 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!
@go16664 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
@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
@rauljr.montesclaros22306 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 !!!
@459HAMED3 жыл бұрын
@@bramcoteelectrical1088 would you then leave L-L test blank on the certificate
@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
@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
@amitmallick93316 жыл бұрын
Thanks GSH Sir,very helpful video,how much price insulation tester.
@GSHElectrical6 жыл бұрын
Hi. They range in price but about £600-800 thanks for watching Gaz
@amitmallick93316 жыл бұрын
Sir i am INDIAN ,wher are you from☺
@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
@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
@sibusisokhanyile30684 жыл бұрын
Which Megger did you use?
@GSHElectrical4 жыл бұрын
1711 thanks. Gaz 🦾
@sibusisokhanyile30684 жыл бұрын
Keep doing these videos there are very helpful
@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.
@abrahamshavuka70644 жыл бұрын
Hi .what values you got from the test and the values should be at least how many Megaohms?
@michaelthompson25732 жыл бұрын
Greater than 1Mohm
@abdulseaforth69306 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.
@GSHElectrical6 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 👍
@abdulseaforth69306 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
@rossmurdoch78705 жыл бұрын
Liked the wee crock link Gary
@GSHElectrical5 жыл бұрын
Thanks 👍👍
@sampenfold23007 жыл бұрын
How would you test all live conductors to earth on a three phase installation using your method?
@GSHElectrical7 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.?
@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.
@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-uu6dg4 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.
@RedUtopia3 жыл бұрын
@@joshstrom2791 so if I get
@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
@gedman95276 жыл бұрын
Do you have to remove. Loads. Like washers cookers
@HandyKindaGuyUK6 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)
@grhevans6 жыл бұрын
GS38 says 4mm max probe length - Monday's session. I'm pretty sure the "older probe" is more than 4mm...
@GSHElectrical6 жыл бұрын
Hi. Max 4mm preferably 2mm preferably spring loaded as stated in GS 38 👍. Gaz
@nathanclaxton53456 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.
@seanmac23846 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
@ConjuredUndead4 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
@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
@skiv366 жыл бұрын
Nice GS38 probe
@randomj61886 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
@GSHElectrical6 жыл бұрын
Hi. The video was to provoke the debate as BS7671 only has 2 boxes for installation resistance 🤔. Thanks for commenting Gaz
@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
@ashsmith30257 жыл бұрын
Are you suggesting that by testing live conductors to earth individually as opposed to combined is wrong???
@GSHElectrical7 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
@GSHElectrical7 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...
@ashsmith30257 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??
@ashsmith30257 жыл бұрын
Sorry less than
@GSHElectrical7 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
@djelectricals345 жыл бұрын
nice sir
@heron952411 ай бұрын
But this test does not detect a fault between line and neutral!!
@shaunbeard5936 жыл бұрын
Why is machine set to dc
@GSHElectrical6 жыл бұрын
Hi this may help www.quora.com/Why-is-DC-voltage-applied-in-an-insulation-resistance-test. We are measuring resistance. All the best this Sunday Gaz
@gadwalidost5 жыл бұрын
hi there what if its not greater than 999 what we need to look for?
@pauljohncross6 жыл бұрын
When testing individual circuits are you not reading the cumulative parallel insulation resistances or faults from all of the connected neutrals to their associated and other grouped CPCs? Wouldn't you need to disconnect the Neutral for the circuit being tested?
@GSHElectrical6 жыл бұрын
Hi. Thanks for commenting and watching. The insulation resistance of the whole installation must be great than 1 M ohm. If you measure individual circuits to have 200 M ohm, 100 M ohm, 50 M ohm and 2 M ohm the overall insulation resistance would be less than 2 M ohms as the circuits are in parallel. Hence you should test with all circuits connect or you would have to calculate the total insulation resistance from all the individual ones. This link might help kzbin.info/www/bejne/g323fmCFf6pjgtE All the best GSH Electrical
@pauljohncross6 жыл бұрын
Understood when testing the whole installation, but at 4:54 you're talking about testing an individual circuit and the neutral is attached... I was under the impression it had to be removed for the single circuit test.
@Bestofthebest3836 жыл бұрын
What if low voltage transformer connected to lighting circuit and it serving fan in bathroom. What voltage test to use and between which conductors ? Thanks
@GSHElectrical6 жыл бұрын
Hi if loads are still in circuit and cannot be removed test only between live conductors (line and neutral) together to earth. Thanks Gaz
@DerekHundik4 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.
@bengimanbrixton2 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.
@GSHElectrical2 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