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readings

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  1. B

    High ze readings. Even higher zs?

    testing a TNS installation today, found a high incoming ze of 1.14ohms, in my head putbthis down to incoming earth issue as all terminations tight, but when I test any subsequent circuit I’m getting much greater zs readings approx 4.0 ohms. I was expecting high earth loops as my incomer was high...
  2. C

    problems with test results

    Hello, Im confused as to why I'm getting a high zs value at the socket but all r1 rn r2 ze is 0.5 but zs is .98 The other problem is a had a rcd won't trip but for some reason when something is plugged in it trips the other rcd. All circuits bell out and test fine so could it be the rcd...
  3. G

    Bizarre Wiring And Readings Through Upstairs Windows

    Hi I don't know if anyone can help, but I'm very grateful to anyone who can provide input. I won't go into the full story, but my windows upstairs appear to have an electrical current running through them. It's only the windows upstairs. They also set off a radio frequency detector. Even if...
  4. L

    Head scratcher!! Strange Zs readings

    Evening all, bit of advice needed please. First time posting in this section because I don't really seem to come up against things that baffle me like this. The job is an EICR on a production plant. Main supply to the plant doesn't have a neutral so someone has installed a 3 phase to the phase...
  5. Dannyg8810

    Confused ...IR readings

    anyone shed some light? 100m run of 4mm nyy cable New cable and getting 135meg ohm when testing surely this should be >999 on martindale mft Checked cable and no damage(visual anyway) I know it's well above minimum permitted but still
  6. SparkyChick

    Interesting IR Readings - Any ideas?

    Hi all, Well, this one is interesting and I have absolutely no idea what could be causing this. Just added a PIR to a lighting circuit, very simple, disconnect the lamp and move the feed cables to feed a PIR and then onto the lamp itself. Nice straightforward. Doing my testing for the minor...
  7. Soulsurfer

    Renovated house low r2 readings !

    Just been sorting out a right mess during a house renovation and tests on newly installed ring final are r1 0.35 rn 0.35 & r2 was expecting around 0.58 but had consistently 0.00 Ohms. MFT was zeroed again from scratch and was still giving a zero resistance reading Almost all cable is new and...
  8. D

    high Zs readings

    Did an EICR in a domestic property, earthing arrangement was a TN-S with a Ze of 0.51 ohms. There are 2 ring final circuits protected by 32amp 60898 type B mcbs. Both circuits have additional protection from a 30mA RCD. My Zs readings for the circuits are 1.63 ohms and 1.89 ohms. My question...
  9. telectrix

    code query

    just done a EICR. good installation, approx. 10 years old. 16th ed.split board, lighting circuits non-RCD, on TT earthing. my query is this: the Zs readings are high, due to the high Ze, insofar as , e.g. lighting circuits on 6A MCB each have a Zs higher than the max. permissible . should I...
  10. J

    Insulation resistance testing Lighting circuit

    Hi everyone. I'm looking for advise on how to test IR on commercial lighting. There's so many lights on 1 circuit , do I have to take out all the lamps in all the lights to perform the test or can I simply test between LN -E ? Even though I have spent lots of time testing domestic installs and...
  11. PhilCumbria

    Off peak and standard

    Hi I have just changed both an off-peak CU and a normal CU. I have tested both. Can i put them both on the same cert or do they need to be on two different EIC's ??
  12. R

    what to suggest when no circuits have rcd protection

    I carried out an eicr and no circuits have RCD protection. There are 3 dbs all have federal elec type 3 mcbs in. Would you recommend changing each db and rcd only the sockets or rcbo everything as its all T&E less than 50mm. One db is lighting and power the other is convector heaters and hand...
  13. M

    IR testing result

    Hi all, I have come across an issue that i know others would have..... I done an Insulation resistance test on a lighting circuit with no selv or pelv just regular pendants circuit. Now the customer informed me they had a leak from a bathroom a few months ago and when i tested this particular...
  14. D

    EICR IR bad readings, any advice?!

    Hey, An EICR was under taken again on property. Insulation Resistance results on at 500V. All results in Mega Ohms LIGHTING L-N 34.80, L-E 2.05, N-E 33 LIGHTING L-N 2.47, L-E 2.97, N-E 2.81 UP POWER L-N 78, L-E 72, E-L 69 DOWN SOCKETS L-N 16.30, L-E 15.41 N-E...
  15. R

    Ze

    hi all, I posted about this recently and didn't manage to get back online till now. I've got a Fluke 1653b multi function meter. In the last few weeks it has stopped recording Ze and Zdb readings ( readings on L-E setting) are 0.00 and on L-N reading are0.00 and PFC is 10kA ( this only happens...
  16. P

    Zs Testing Tt

    Hi Guys Job - semi detached with a TT earthing arrangement. I used the Z loop function on my MFT to check the earth at the DB. Reading 164 ohms - ok. Same reading with earth reconnected. However if I do the same test with the Zs RCD function, I get 204 ohms. Why? Do I have a MFT fault? I need...
  17. leep82

    DB change/EICR

    Hi all, yesterday i went to a property to do an EICR in preparation for a DB change next weekend. The existing DB has six circuits, cooker, 2 x rings and 3 x lighting circuits. Bonding to gas and water is in place and adequately sized so providing everything tested out ok a relatively straight...
  18. A

    Very high earth loop readings

    Was out doing some defect repairs on a system with a few high earth loop readings. I had previously been on site and tested the circuits with the high readings. For one of the circuits I had a reading of 1.28 ohms for a C50 t/p mcb it was rather high. So the idea was to remove the mcb and...
  19. P

    Megger MFT1730 2016

    I am thinking about buying the Megger MFT1730, I have read bad reviews (before 2014) on the no trip test and z readings being off. Does anyone know what the 1730 is like now in 2016? is it worth buying? has there been any software upgrades to fix the issues? any info is appreciated
  20. H

    WANTED: Meter Calibration NE

    Best place to get meter calibrated NE (Durham/Newcastle) - any thoughts? It's Metrel if that makes any difference.

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