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resistance

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  1. J

    Acceptable TT earthing resistance for EV point

    I understand that some vehicles do a check on the earthing resistance before they allow themselves to connect to the charging point, so irrespective of whether the earth resistance is in line with the regs, it may not be 'acceptable' to some vehicles. Does anyone know what value of resistance...
  2. Q

    Insulation resistance with vulnerable equipment unable to be removed

    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...
  3. C

    How do i calculate the total resistance in a series-parallel circuit?

    Hey, I'm an electrical engineer in training and i was wondering how you could calculate the total resistance in a series-parallel circuit? I attached a picture of what it looks like. If it's to any help resistor 1 is 2, r2 is 3, r3 is 4, r4 is 5 and r5 is 6 Ohm. Thanks for any help
  4. B

    How do I calculate the resistance of a spur without phisically testing ? ..

    Boffins of the electrical world ... How can I calculate the resistance of 48m ring 2.5/1.5 .. with a 8m spur .. I can quiet easily do this without a spur in the equation but , my test papers require my doing so with an 8m spur. . how does this affect the zs tests ... Thanks v much ...
  5. C

    Rise in resistance during test video

    Why does the resistance go up during this test? View: https://youtu.be/8040r2iLqyM?t=1150 In fact it goes up several times during the video. Is this the wire charging up from capacitance? I'm clueless.
  6. KeenPensioner

    Insulation resistance with broken line conductor

    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...
  7. S

    Insulation resistance testing

    456megaohms on a 25m 3core swa is acceptable as its more than 1megaohms. Correct.
  8. HappyHippyDad

    Global Insulation resistance <1MΩ but individual circuits are all > 1MΩ

    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...
  9. P

    Low N/E insulation resistance

    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...
  10. D

    Quinetic controller ok with 500v insulation resistance test?

    Hello Everyone Hopefully the title is self explanatory. Or should I disconnect it for the test?
  11. A Basic Understanding of Voltage, Current and Resistance.

    A Basic Understanding of Voltage, Current and Resistance.

    An easy to understand lesson in Voltage, Current and Resistance for electricians. Learn about the basics of voltage, current and resistance in this video tutorial.
    • Lou
    • Media item
    • current electrical training resistance voltage
    • Comments: 0
    • Category: Trainee Electrician Videos
  12. R

    Insulation resistance check

    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...
  13. T

    Resistance in a Volt meter

    Most meters today I understand are multimeters but I am only interested in the volt meter circuitry. The reason I am asking this is because the volt meter seems to only register voltage across a load and not on a plain conductor such as the neutral circuit. In my limited experience and...
  14. SparkySy

    aemc ground resistance tester 3705

    Hi to the knowledgeable collective, I recently was given one of these clamp meters for helping a friend out, however upon researching its uses it looks like it's for testing ground spike or plate resistance. Has anyone used one of these and do you have any guidance in their use? I found the user...
  15. D

    resistance problems 2002 jaguar S type

    Hi bit of a strange one as load is put on my electrical system the resistance across body earth increases if I measure negative battery lead resistance it rises from 0.1 Ohm to about 10Ohms Any ideas how to fix Cheers Dave
  16. E

    Insulation Resistance Results

    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...
  17. W

    Body’s resistance with mcb only

    If there’s 230v and the body’s resistance is high .. Meaning the current will be very low but enough to kill you. Can we get electrocuted without having a 30ma rcd to stop this as the 6amp breaker will not have tripped ?
  18. T

    Insulation resistance test on length of SWA cable

    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...
  19. Ewi

    Current draw discrepancy

    Hey all. Im new to this forum. Seeing how limited d web is to rectifying any electrical queiries, i thought i might find this useful. I am a warranted electrical domestic licencee. (Based on IET) and possess a Higher Diploma in Electrical Engineering. I live in Malta (EU) which uses a UK...
  20. Tom Crabbe

    MINIUM INSULATION RESISTANCE READING

    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

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