readings

readings

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  1. A

    Marginally high CPC end to end readings

    Sure this has come up before but yesterday testing after adding a spur and end to end readings on CPC come out about 0.2ohm over expected reading (was expecting about 1ohm from LL & NN (0.65) Checked all sockets I could see (some were very old so suspect the sockets themselves might be a...
  2. J

    Insulation resistance test readings.

    Had an interesting one today, ring circuit blown the Mcb in a kitchen apparently a few times over last day or so. It has blown once when nothing was really in use in kitchen so kind of ruling out overload. When turned up and turned it back on it held for maybe 5 minutes before blowing again…...
  3. P

    What causes low IR readings?

    I’m currently at the second fix stage of a rewire and before all the flooring goes down I’ve decided to do r1+r2 readings to make sure everything is continuous and polarity is correct. I also decided to do insulation resistance tests and have got lower than expected readings. On the downstairs...
  4. M

    Voltage spike causing strange readings?

    Hi guys, Our client called us out to assess a fault in one of their buildings today, it turns out that certain circuits (those with fixed electronic equipment within them) are now acting as if there is no load and the neutral wires back at the board are now showing 230V to earth. Could a...
  5. E

    Different kw readings

    Hello, I’m testing some electric meters. As the circuits have no load on them to prove each ct I’ve plugged a hair dryer to simulate a load and put the ct around the line of the hair dryer to check measurements are the same as a calibrated meter. The Ct’s from each phase read the same Amps...
  6. A

    Megger MIT420/2 unstable continuity readings?

    Chaps - having problems with a new Megger MIT420/2 insulation/continuity tester 'oscillating' and failing to give stable resistance readings in continuity mode with some motors (although it did it once on a Cal Card!). I don't think it's a duff unit, but anyone else have one and experienced...
  7. A

    Help with Readings on circuit

    Hi Can anyone clear up or explain in a bit more detail what could potentially be causing the results I have. I have just tested a 32a ring main wired in 2.5mm twin on B32 Rcbo. There are 8 sockets on the ring and all are in plastic dado trunking in 2 offices. The readings I have are: L-L= 0.76...
  8. E

    Ze readings >2000Mohms

    Fluke MultiFunction Tester 1662 TNS Earthing system. Switchboard - 415v - 3 Phase + Neutral + Earth. MCB 1000A 3 individual Earths (185mm) connected to the Switchboards Earth Busbar via a main earth bar which is then connected to the sites Earthing Grid that is bonded with exothermic...
  9. D

    Readings from a multimeter

    Hi I am trying to do the 180 degree test on the aramature of a 240 volt electric motor, out of a blender. Youtube would sujest that the resistance readings should be about the same if there is no fault. I am getting the following- 1.4 2.6 4.9 5.4 7.0 8.0 9.0 10.5 11.8 12.4 12.1 12.7 Likewise...
  10. G

    How accurate are solar panel output readings?

    Hello Is it possible for solar panel monitoring to over state the actual power generated by the system? My friend’s 6.4kW system has generated 1280 kWh in the 82 days since its commissioning on 1/12/2022. Extrapolation of this output predicts an annual production of around 5,700 kWh which...
  11. E

    cooker element readings

    I have measured the following readings to earth on a twin oven---- Element 1... 0.149, Element 2... 0.9, Element 3... 0.88 , Element 4 0.08. These all with the merger set at 500v. they all seem low to me especially Element 4, needless to say the RCD trips randomly.
  12. L

    R1 + R2 expected readings

    Has anyone got a table of expected R1 + R2 readings that give a guide to what readings we should be getting when testing
  13. 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...
  14. J

    UK Zs readings unusually high on new installation, what is the best option to lower them?

    I've just finished an installation on a large outhouse around 50 meters from the main property, but I'm having issues with unusually high Zs readings within the new installation.. The nature of the installation is a TNCS system with 25mm tails & 16mm cpc Henley blocked from the main supply to a...
  15. alexander jackson

    UK Zs Readings seem to be a bit low.

    Gents. I did some earth loop tests on Rolec power pedestals (2x 16 amp outlets) that are harbour side, looped in and out from one another. Three months ago I got Zs readings from about 1.2 ohms to 0.50 ohms. This time round the readings are all less than 0.01 ohm. Megger MFT meter. The RCD in...
  16. Diocm7

    Two eletric meters and three readings.

    Hi there I recently moved to a new flat and it have two different eletric meters. The first one is a regular one and the second one is one for the economy 7 tariff I think sibce it have meters for low and normal. Wouldn't only the second be enough? I attached the photo. Thanks for the help
  17. R

    R1,R2,Rn versus r1,r2,rn continuity readings on EICR.

    Looking at the EICR form. GENERIC SCHEDULE OF TEST RESULTS Looking for clarification on R1,R2,Rn versus r1,r2,rn continuity values. I have reached the some conclusions. Do r1,r2 and rn only apply to ring circuits and R1,R2 and Rn (not on form) to radial? It just looks like that might be the...
  18. newfutile

    Strange IR readings on 3 phase board

    I am unable to take global IR readings on a 3 phase consumer unit, i have disconnected the neutral but when i try to measure the meter never settles and eventually times out. i have tried 2 meter/s with same results
  19. V

    Different Ze readings

    Hi, I've had an unusual result from taking a Ze at a clients house and wondered what everyones take on it would be: The property is TN-C-S A Ze reading from a disconnected Earth to Line gave a reading of 0.45 ohms A Ze reading from the Line and Neutral gave a reading of 0.33 ohms A TN-C-S...
  20. B

    Current transformer metering producing implausible readings

    Edited - please read right to the end! Grateful for any advice regarding CT metering which seems to be generating inaccurate/implausible readings. Our charity has a commercial building with 3-phase connection into a busbar chamber at one end - let’s call us ABC. The rest of the chamber...

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