Good evening
Was wondering when testing for.insulation resistance and there is vulnerable equipment in circuit but unable to disconnect, I understand that you combine the line and neutral conductors and test to earth. I am just wondering if it's ok and safe to do this at 500v as there is no...
Hi, I'm not an electrician but I'm studying the material required for the C&G 2394/5 just for the sake of it. I think I understand the theory behind insulation resistance testing (but maybe not!) and the reason the test is performed at 500V (insulation condition, fault finding) and that loads...
With regards the title is the reason for this because the circuits are all in parallel?
I am talking in relation to a L/N - E test.
If Rt = global resistance for whole CU and R1, R2, R3 = L/N - E resistance for each circuit then am I right with the following:
1/Rt = 1/R1 + 1/R2 + 1/R3
So...
Hi all,
Just installed a brand new radial circuit for the upstairs sockets with Prysmian 2.5mm T+E, around 21 metres in length. When testing the insulation resistance of the circuit upon connection to the consumer unit, I seem to repeatedly get around 49 Megohms when measuring Neutral to Earth...
Hi - I have a Warm-up underfloor heating system. And it's stopped working. I did a basic resistance check - and clearly there's a problem (shows just 18ohms when it should be nearer 200). Warmup have said they can send an engineer around to lift a tile after doing a thermo heat check...
Hi, I’d like some clarification with regards to insulation resistance results I’ve got.
Carrying out initial verification on a new ring final circuit. New cable, 9 new MK double sockets.
r1 - 0.43
rn - 0.42
r2 - 0.68
R1+R2 - 0.28.
Carried out insulation resistance test:
L-N - >2000 MOhms
L-E...
Doing new supplies for a school new Shneider 3 phase & N MCCB panel board. 50mm 4 core SWA one end made off in the board earth fly lead from banjo to earth terminal. The other end gland made off in gland (fly lead not made off yet) 3 phases and neutral just hanging there. Done installation...
Hi. I have a question about earth leakage meter usage/selection.
I see that people say one should test the live wires not the earth for reasons you guys probably understand. However earth leakage meters with large Jaws to loop around both tails are much more expensive.
Can I use a combination...
Hello,
has anyone noticed in the new GN3 that any reading below 20 Mohms now has to be investigated or is this a printing mistake as it used to be 2Mohms?
Thank you
Tom
Good afternoon, apologies if this has been covered before i've not long joined so gradually finding my way around.
I have my Part P assessment coming up on a new installation and would like to hear some opinions on how people carry out their IR tests.
In guidance note 3 it gives an example of...
I am just working through my understanding of the insulation resistance test, and I want to find out the best way to do the combined Live-Earth test where the Line and Neutral conductors are connected (joined, or however it is best described) through one probe of the tester, and the other probe...
On a new install of a shower circuit, with a neon isolater, is it better to use choc blocks to bypass neon isolater or would it be ok to just test live-earth (live being neutral and live combined) and miss the live-live test?
If testing just live-earth, would you write it down in details of...
Back in 2013 I had a Domestic Electrical Installation Condition Report done on my rented property - nothing horribly major but one thing I didn't understand...
I had a C3 code for "0 ohms readings for I.R test for sockets & lighting (unable to remove all loads sockets, lighting had electronic...
Hi,
This is my first post, although I have been browsing the forums for a little while now.
I work in BMS and have my AM2 on friday. The nature of my work means I don't get to test so there are a few things I'm unsure of and was hoping for some clarification.
I know for some people they may be...
Advice or quicker ways for doing i r tests on an eicr generally what I have been doing over the years is live to earth neutral to earth and joining live and neutral together then testing to earth job done but my pal who has recently had his annual nice i c visit said he's been shown a new...
Hi everyone
I have a customer who has a RCD that trips during the night and it resets ok the following day it is ok for a week or so then it tips again during the night.
has any one any ideas and what is the quickest way of finding out what the cause is.
also
I need to do an insulation...
Hi all.
I'm a 4th year electrician currently awaiting to finish my trade test. (FICA in Scotland) the only parts I have to pass is the testing part and fault finding.
I'm currently studying testing as this is something I have done the minimum of onsite.
Could someone tell me how I would...
Hi yesterday I sat my FICA test and during the insulation resistance test I’m not sure if I made a mistake
I measured it doing individual circuits I had the main switch at db on but forgot to turn on the mcbs
I measured between Line at MCB and earth and Neutral bar to MCB then neutral bar to...
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