Do YOU Know What Happens to a Circuits Insulation Resistance When the Circuit Length is Increased? kzfaq.info/get/bejne/g9JpaLd31cnMnXU.html

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 👍

absolutely spot on, straight to the point, very clear explanation, head and shoulders above my 2391-52 course leader's explanation.

Thanks for your time to make our study much easier and understandable. Wish you all the best.

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.

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.

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!

Hi GSH, thank you for the video. Very helpful method to allow the collection of the combined reading

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.

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

I enjoy all presentations more , I depend on them

Thank you for posting this video. Hopefully should help me to pass my AM2 next week! Liked and Subscribed!

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.

Great video.Great teaching skills.Appreciate your work mate.

Dear sir a most brilliant tweek.keep up the great work and videos.thankyou loads.

Really helpful. Appreciate the efforts put in to share this knowledge. Keep doing the good things.

This video has been some help.

Thanks for improving knowledge

Thank you very helpful

Hi GSH, thank you for the video. Very helpful

Been a spark for ages this is good time saving idea. Bit like a gobal test but good time saving idea

Well done, Thank you

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?

Your lessons are really helpful

Top class!

Liked the wee crock link Gary

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 !

Great video 👍

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.

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?

Thanks this is really help full!

Great video thanks

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?

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".

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.

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?

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!

Thank you.

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?

Nice GS38 probe

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.

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

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?

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?

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.

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

for lighting circuit do I need to remove strip lamps or lower the voltage ?

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.

GS38 says 4mm max probe length - Monday's session. I'm pretty sure the "older probe" is more than 4mm...

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???

Hi. Instead of that crocodile clip. Cant U just use 3rd neutral cable? Coming out from meeger tester? I

the mega meter was readfing 999 but on the result sheet you wrote +299 ?

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

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.

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.

Excellent vid, what was the need to repeat the test for the 2 way switches??

nice sir

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?

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?

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.

Thanks GSH Sir,very helpful video,how much price insulation tester.

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?

Do you have to test every cable at every point in the circuit you are testing, or just at the distribution board?

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 ?

Im an electrician in canada and we never do this kind of testing

Hi, How can you get IR on the DB supply cable from supplh meter if its live and cannot be isolated?

Does not work with pme. Disconnect earth from met?

But this test does not detect a fault between line and neutral!!

If you have an MEN link between neutral and earth do you have to remove that before you run these tests

So performing an IR test this way is acceptable if rcbo's are present?

😊

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?

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.

When you test between live and neutral you have other neutral wires also connected to the bar. How is this ok ?

Does every installation have a double pole isolation switch for doing the IR test ?

Please electrical dead test in hindi

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?

How we can test a ring circuit for insulation resistance

What if you have led intergrate lights which you cant remove? How to perform test

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?

Easy like drink water, thanks, though

What is the main reason for this test

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.

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?

Hi

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

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

Are these probes not against the regs

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

Hi Gaz.... Could your method ( using the link wire) be used with RCBO's? I ask because of the neutral connection through the RCBO.

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

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

How would you test all live conductors to earth on a three phase installation using your method?

test on OK instalation as an exampele has no point really It should be faulty one to point what the problem could be.

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?

Hi .what values you got from the test and the values should be at least how many Megaohms?

Which brand is the IR tester? I need one like that.

Which Megger did you use?

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

Are you suggesting that by testing live conductors to earth individually as opposed to combined is wrong???