readings

  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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.
  8. 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
  9. 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...
  10. 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...
  11. 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...
  12. 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
  13. 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...
  14. 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...
  15. 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...
  16. banny07

    UK I am getting very high zs readings

    Hi Guys. When measuring zs I get very high reading. Ze is 0.3 (tns), zdb is 0.21. r1 and rn are is 0.42. r2 is 0.72 , r1+ r2 is 0.29 . when I test zs it 8.26 ohm new to testing. I even buypassed rcbo but it stays same. Do you think my mft if faulty? Any thoughts guys? I am new to testing.
  17. T

    Battery/solar/inverter system gives inaccurate power readings

    Hi, I have purchased a battery/inverter/solar system for my home. I also have a smart meter, and an app which links into my smart meter to get the power data from the smart meter. The battery/solar/inverter system also tells me how much energy I am using. However, its readings are not accurate...
  18. P

    Low IR test readings on lighting and RFC.

    Hi,guys went to do an EICR and when doing IR test I got L-E ON RFC like 0.02 MOHM and two lighting circuits L-E AND L-N the results were like 0,14 and 0,15 MOHM.It is old wiring where all the cables live and neutrals are black put in the walls in steel conduit.My question is is it possible that...
  19. S

    Voltage readings

    Came across a weird one today… Four single black stranded 12gaTHHN running through 1/2” conduit about 40’ to first outlet box and 70’ to the last, on a branch from main panel. One 20A breaker and one 30A breaker. The homeowner asked to eliminate existing locations and reroute, no problem. I...
  20. Dartlec

    Low Zs readings on MFT1771

    My main tester is a Megger MFT1711, which I bought second hand but came with a calibration certificate. Rather than annual calibration, I have a calcard and check it monthly(ish) and keep records, which my NICEIC assessor has been quite happy with for years... I have an original MFT1552 which...

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