resistance

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  1. T

    How to measure rail-to-earth resistance and rail-to-earth potentials

    Dear forum members, Would you give please a practical tips how to measure and what measurement equipment to use (with some examples if possible) to measure the rail-to-earth (tunnel) resistance and rail-to-earth (tunnel) potentials? The measurements needed to be done in the tunnel (cast iron...
  2. Dougie Reid

    Can a glow plug has no continuity & resistance but still short a circuit?

    I have an original 250w glow plug in my 8yr old pellet boiler that's used to light the pellets during the start up phase on my boiler. The boiler has been tripping the fuse on around 50-60% of the start-up cycles. Using a bit of trial & error I think I've narrowed it down to the glow plug :)...
  3. D

    Stage 2 insulation resistance test

    I have installed a circuit for an oven and carried out all of the relevant testing so far. Apart from a neon on the double pole isolation switch, there is no current using equipment connected to the circuit yet as the property is empty. In this situation, would one just make a note on the...
  4. R

    Insulation resistance for devices

    I was checking the IR on a socket circuit and found 0.4M between neutral/earth. The reading came from a garage door motor that was plugged in. once unplugged the IR was good. Does the circuit need to be cleared of all things plugged in when testing or does this constitute as a fault. I was...
  5. R

    Do dimmers interfere with resistance testing

    I just built one of those steampunk pipe lamps. I was assembling and testing connections via resistance and a multi meter. Everything went well until I added the rotary dimmer switch. I lost all continuity. After some fussing, I loosely assembled the lamp and plugged it in. Don't worry I checked...
  6. Calebp43

    Insulation resistance confusion

    Been to a fault finding job and lights where tripping the rcbo. After further investigation we found that it was a blue strapper cable (old wiring) from one switch to another using 3 core. Let's call this cable 1. After hacking some of the cable out the wall we found that the other flat t and e...
  7. J

    Insulation resistance test

    Evening chaps, I've been asked to do a visual inspection, and an insulation resistance test on a fishing boat, which is working off 24v, this is a new ruling apparently, and without me signing it off as ok, the boat is currently docked, and not allowed to go out fishing. The visual checks...
  8. T

    Low Insulation Resistance readings N-E

    Looking for some guidance here. I'm currently shadowing a guy and we're testing a new extension on a school. 3 phase TNCS supply from the original busbar. Feeds a section board and from the section board it feeds 4 3 phase DB's. The DBs have one feed in and then split to a separate power and...
  9. K

    How does Touch voltage work without RCD protection

    Hi everyone I asked my assessor about touch voltage and he was not keen on explaining properly and gave me a rough answer which made me think probably he was not sure himself or was hiding it. basically my understanding is afcourse that how 30mA RCD works to limit touch voltage to 50V is by...
  10. Neptune

    Insulation resistance test on a damaged conductor

    I have a 2 metre T&E cable. I applied a IR test (500v) across P and N to E with the other end of the cable safely sitting on the floor and it reported the meter maximum. As expected. I then completely cut through the N conductor on the cable and repeated the test. It still reports the meter...
    • Neptune
    • Thread
    • conductor damaged insulation insulation resistance insulation resistance test resistance test
    • Replies: 21
    • Forum: UK Electrical Forum
  11. Pegasus

    Insulation Resistance Test, trying to wrap my head around it

    I am self-teaching fault-finding and testing, but I can't wrap my head around insulation resistance tests. From my understanding you send 500V for domestics down the conductors using an Multi-Function Tester, and the values should be over 1M Ohm, now my question is why should the resistance be...
  12. W

    Insulation resistance query

    Was testing a 3 phase DB for storage heating. While testing I noticed I was getting continuity between 2 of the circuits, which were on separate phases. Each storage heater has its own 20A radial, and when doing an insulation resistance test between 2 of the circuits I get a reading of 0.00...
  13. B

    Insulation resistance testing query

    Downstairs lighting is tripping rcd. Circuit has 4 chandeliers with multiple bulbs and led downlights in the bathroom. Can I just test IR on 250v setting between L,N & E and expect the same results as testing with 500v.
    • bhamoggy
    • Thread
    • insulation insulation resistance insulation resistance testing query resistance testing
    • Replies: 3
    • Forum: UK Electrical Forum
  14. O

    AM2S Assesment , Insulation Resistance

    Just done my exam, passed everything except Insulation Resistance... I can't think how I could've failed because it isn't the hardest thing on the wrold, Tester was on 500V and I tested circuits separately. Only way I could've failed was how I tested my Ring Final, I wago one leg of ring...
  15. B

    Low earth resistance continuity test

    I’ve just carried out a continuity test on a rfc. And I’m getting a lower earth resistance Reading than the reading on both the live and neutral wires. its a circuit in a house converted into two flats and the circuit is wired in 2.5/1.5 twin and earth. Live and neutral are both 0.46 earth is...
  16. HappyHippyDad

    What are the dangers of poor insulation resistance results between neutral and earth?

    What are the dangers of poor insulation resistance results (i.e <1Mohm) between neutral and earth? If all other tests are ok, what are the dangers of the above? My thoughts are it may indicate a breakdown of the insulation somewhere. However, what are the dangers of this breakdown between...
  17. J

    Global Insulation Resistance Testing at CU

    Evening all, as I’m preparing for my Inspection and Testing exam, I wonder if you might put me straight on something please? When performing a global insulation resistance test at the CU, I would link the L busbar to the N bar then afterwards to the E bar. I understand that the circuit...
    • Jenna T
    • Thread
    • insulation insulation resistance insulation resistance testing resistance testing
    • Replies: 1
    • Forum: UK Electrical Forum
  18. S

    Resistance in loom wires

    Hello. I am looking into the wiring loom of my 53 year old car and the fitness of the wires and connectors within. I have the two part loom that runs from the rear lights to the fuses under the bonnet out, and have been measuring the resistance of each line. Question is; what would be considered...
  19. J

    basic 3 core wire water resistance

    Dear Electric forum members ,Thankyou for reading this question maybe someone can help or point me in the right direction,I have been recently flooded and had water under my floor boards which covered some of the electric cables on the downstairs socket ring ,the cables were sitting in the water...
  20. UnderstandingElectrics

    TN-C-S supply, shocks from earthed sink, latest test from landlord 200Mohm resistance between E/N

    TN-C-S supply, shocks/tingles from earthed sink. Latest NICEIC test (2017) from landlord shows 200Mohm resistance between E and N As above, do I have a floating neutral, is this causing a leak from N, via bonding on sink to true earth (solid kitchen floor)?
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