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resistance

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  1. 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...
  2. 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)?
  3. E

    Winding resistance tolerances in three phase motors

    Hi guys, Is there a standard tolerance percentage that should be followed when checking the winding resistance of each coil on a three phase electrical motor? The general rule of thumb I followed when measuring winding resistance was that each phase winding had to be identical or close to...
  4. P

    Insulation resistance of Pink Fibre

    Hi there, Does any one know what kind of insulation resistance to expect for pink fibre wall/ceiling insulation? I'm trying to figure out if the cheap insulation meter I have is actually giving me a reasonable answer. here's a bit of background: I have a GFCI mounted in an electrical panel...
  5. D

    How do you disconnect neon lights in sockets while doing insulation resistance test.

    Hello everyone, I was just wondering how do you disconnect neon lights from socket outlets when doing insulation resistance test, as this will effect the readings, thanks.
  6. dokkan1080

    Main Earthing conductor max resistance?

    I know main bonding to water and gas need to be 0.05 ohms But what about the main earthing conductor? Does it have a maximum resistance value from MET to the CU?
  7. C

    Parallel Arc Fault Resistance Found to be 0.03 Ohms

    Page 337 cites UL testing, where arc resistance was found to be only 30 milliohms: https://www.nfpa.org/assets/files/AboutTheCodes/70/70_A2022_NEC_P02_FD_PIReport_1of2_rev.pdf (You may need to sign in to view, its free) Anyway, here is the value and equation as dervied from UL: The...
  8. E

    Resistance loads

    I’m having a mind blank. If there is no load in a circuit e.g L-N was bridged at a light. Then there would be a high fault current. What if there is only one light or load on a circuit with a low resistance. Is there a minimum load resistance needed in a circuit?
  9. B

    UK Insulation resistance whole board.

    Hi all. Changing a CU in an ex-council flat, pme system, no RCD's, and initially tried to IR test whole board L/N joined to earth, got a reading of 0.28 Ohms. Then did each circuit individually (2 X RFC, 2 X lights, 1 X cooker), L/N joined to the circuit's CPC, and got between 0.25 and 0.30...
  10. H

    how would i calculate resistance using Vcc, input impedance and logic-high threshold?

  11. KeenPensioner

    Insulation Resistance zero Ohms

    Hi all. As I've said before, I'm not an electrician but an adult learner. I have a second hand Fluke 1653B MFT which is out of calibration but I use a CalCard to see how far out it is and it's not too bad. I've watched a thousand videos on EICRs etc and just want to increase my knowledge - if...
  12. timhoward

    Insulation resistance difference both ends of ring final cct

    Initial fault was RCD tripping, narrowed down to a ring final cct. IR tests on that cct with all loads removed were showing almost zero between neutral and cpc. So I broke the ring apart and eventually found the nail through a cable, and got that all sorted. Now its testing ok in as much as...
  13. J

    Insulation Resistance query

    When doing domestic testing, I spend quite a bit of time removing loads & vulnerable equipment prior to carrying out IR tests- allowing me to test between L - N without risk to vulnerable equipment or getting inaccurate readings. I’ve spoken to a number of sparks who go straight to testing L&N...
  14. cliffed

    Short circuit protection on high resistance on live conductors

    Thoughts on this scenario,obviously a short circuit fault situation
  15. K

    Low Insulation resistance test on smoke detectors

    Hi Everyone Just a question bothering me as you cannot do Insulation resistance test on smoke detectors as they can become damaged so obviously smoke detectors are sensitive but they are also installed on lighting circuit so if perform low insulation resistance test 250V between Live and...
  16. D

    Insulation Resistance - Low Reading on Ring

    Newbie Testing Question: I am getting a very low IR reading between L&N on a kitchen ring (0.01M). The ring was working fine with no tripping before testing. Can anyone shed any light on what may be causing this low reading? Thanks
  17. J

    Insulation resistance on new installation

    I have recently completed a rewire as part of a complete back to brick renovation in a pretty standard domestic property. Upon carrying out initial verification I uncovered a few strange IR readings. Multiple circuits with low(ish) readings of around 150-200Mohm. However they all tended to rise...
  18. D

    Is it ok to do insulation resistance test on RCBO at 500v?

    I know you are not supposed to do a insulation test on circuits that are protected by an RCD at 500v because it may damage the electronic components inside the RCD so that's why you switch the RCD off before you test the individual circuits, however, what if the circuits are all protected by...
  19. Q

    Insulation resistance query old style hager rcbos

    When carrying out insulation resistance testing on old style rcbos (hager) I understand you are supposed to disconnect both line and neutral aswell as both the neutral and functional earth fly leads.....however does this in theory mean you need to disconnect the above for all rcbos at the same...
  20. C

    A coil of inductance 0.1 H and resistance 40 Ω is connected to a 230 V 50 Hz supply. Determine

    A coil of inductance 0.1 H and resistance 40 Ω is connected to a 230 V 50 Hz supply. Determine, showing all calculations, the impedance of the circuit. Anyone help me I don’t want the answer just a guide

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