How to Carry out an Insulation Resistance Test of our 1 Way Lighting Circuit
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- เผยแพร่เมื่อ 26 พ.ค. 2024
- Students training aid for testing insulation resistance. Demonstration shows how to set up your Megger MFT tester and show you how to carry out an insulation resistance test for our 1 way lighting circuit. Test voltage is 500V DC and the minimum acceptable value according to BS 7671 is 1 megohms with further investigation when the reading falls below 2 megohms.
== 🕐 Time Stamps - Cut to the action 🕕 ==
00:00 - Insulation resistance test
00:16 - Earthing conductor needs to be connected
00:49 - Remove all loads, covers on and switches on
01:05 - Switch off RDC's, RCCB's and RCBO's
01:15 - Setting up my MFT tester
02:08 - Testing my leads
03:10 - Why are we testing the insulation resistance
04:08 - Removing loads
05:15 - Testing between line and neutral
05:45 - Testing between line and CPC
05:55 - Testing between CPC and neutral
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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just needed this quick refresher before my test today, thank you man honestly; you're honest, clear and precise. keep it up, Gaz is the best!
GSH definitely the best tutorial videos on you tube. Clear explanations by people who know what they’re talking about.
Massive thanks for the positive comment 👍🏻. Gaz
@@GSHElectrical Pleasure mate, I started
to retrain as spark at the age of 55 after being made redundant in my own trade once to often.
Signed up with able skills and passed level 2&3,
18th edition and PAT testing.
Nearly completed my NVQ portfolio, just one example of fault finding and testing to complete.
Your videos have been priceless. 2391-52 booked up for spring then am2 to follow.
GSH have given me so much help alongside my study just wanted to say thanks.
Very good point about checking condition of test leads, thanks!
Nearly finished my install side of my nvq and will be onto my testing section in the coming weeks , these videos are so clear and easy to understand I wish I went to your college
Thanks for watching and the great comment 👍🏻. Gaz
As an adult learner 6 weeks into a 2365 course, these videos are awesome and so helpful. I hope one day I can find someone like you to work with/for... Keep them coming... :)
Thanks Gaz very cool! 👍
Thank you so much got my exam on periodic inspection and testing and i needed to see this done to apply the theiry thats in my head.
Your video helped!
Great videos mate. some of the best I've seen on TH-cam! You should be commended. Any videos on fault finding would be another that is greatly appreciated as I find there is a lack of videos online
Hi. Team Electrical have just visited an AM2 Centre today so we will continue to build more content over the coming 12 months. Thanks for the support and watching GSH Electrical 👍
Gaz I think it would be beneficial for the students watching this to show how not removing the loads the possible problems that can acrur such as scude readings and possible damage to sensitive equipment.
== 🕐 Time Stamps - Cut to the action 🕕 ==
00:00 - Insulation resistance test
00:16 - Earthing conductor needs to be connected
00:49 - Remove all loads, covers on and switches on
01:05 - Switch off RDC's, RCCB's and RCBO's
01:15 - Setting up my MFT tester
02:08 - Testing my leads
03:10 - Why are we testing the insulation resistance
04:08 - Removing loads
05:15 - Testing between line and neutral
05:45 - Testing between line and CPC
05:55 - Testing between CPC and neutral
I have a question , how do you draw a circuit diagram of one lamp controlled by one switch the show how insulation resistance test is carried out on the circuit
hi , all wago push fit connector are designed for 450v , what will happen to those connector whan the circuit tested with 500v for insulation test?
What if there led floods on the circut (you cant remove the lamps)?
As you are doing the test on the bus bar directly and not isolating the neutral form that specific circuit, would you need to disconnect all appliances from all the other circuits so not to damage any equipment ?
Hello , was wondering if you performed this test on an installation with multiple circuits on it and clamped on to the neutral bar to perform the test for the lighting circuit, would it take in the resistance of all the other neutral conductors on the system? Cheers 🍻
th-cam.com/video/Ek1u2RjQffU/w-d-xo.html
Have a look at this... and yes to your question 👍. Thanks for commenting and watching. Gaz
thanks for the video.
why is the insulation between neutral and earth so high?
at tncs shouldn't it be a few ohms?
is it because the RCD is switched off so both the phase and neutral are disconnected?
thank you,
roy.
+rm0rgy +
Hi. The insulation resistance test requires the main earth connecting and all live conductors (line and neutral) isolated. If you have a TN-S or TN-C-S the earth and neutral are connected together on the supply side could give an insulation resistance reading of zero between them. All the best GSH Electrical
If the circuit is 230v why would we test at 500v? I understand doing 500v for three phase because it's 415v, but why 500v for a 230v circuit?
Do you have any videos on fault finding?
Would be very handy. I cannot seem to find any
you're looking at one
If we have more than a one circuit or mcb do we need to disconnect the pcp or the n from the bar and thanks gaZ for your help
Quick answer is NO 🦾👍
Why did you need to turn off the RCD as you had the CB turned off. Was it just an extra precaution or what is the theory ?
Hi Gaz on which tests do use the link between line and neutral. Thanks
Hi during fault finding and as part of a socket circuit testing. Thanks Gaz
Thank u could I send the link to the video that show it plz
I was told on my testing course that you can short the line and neutrals and not have to worry about removing any lamps or turning switches off ... and to test on 250 .... is this correct
Hi. In this video we are testing a new final circuit and not carrying out testing as if we were doing an EICR. This video is for my learners at week 7 of year one training. Thanks for commenting and watching Gaz 👍
How would you do this test on an Led gear tray please.500V would destroy the light fitting.
Connect the line and neutral together and test it against Earth or disconnect the light fitting
As the test is only for the wiring to that circuit, should not the regs call for the wiring to be disconnected to ensure that no possible faults from any external sources (such as a faulty breaker etc.) are eliminated?
Hi. You are required to have the external earth connected during the insulation resistance test. Thanks Gaz
Ok but what about the line and neutral, should they not be disconnected?
Hi. If you had a 15way consumers unit would you want to disconnect all those conductors and the torque them back up. This link is to another version of the test on my channel
th-cam.com/video/Ek1u2RjQffU/w-d-xo.html
Thanks once again Gaz
Ok I see what you are saying there and agree with you, but could you not combine this test with the test where you have the conductors disconnected for the circuit resistance tests anyway before torquing them back up? I'm not trying to be difficult, just wondering :)
Hi. Love your thinking but you still need the external earth from the supply connected during the test. Hope you like my link to the combined live conductors to earth test for installation resistance. All the best Gaz
Hi, enjoy your videos.
Just a question off topic. I did a domestic installer/17th edition course 3yrs ago and was looking for some weekend work (as I work full time) with the hope of full time work down the line.
Any websites or contacts you have for this in the London area.
Thanks
Ross
Thanks for the great question. Sadly I am from around the East Midlands but I wish you all the best in finding work all the best GSH Electrical