readings

  1. N

    Insulation resistance - strange readings

    Im getting some strange reading on a new circuit(ring main) ive installed and i was wondering if anyone else had experienced the following. insulation resistance at 500v on L-N is >500mQ (which is fine) then insulation resistance between N-E starts at 400 then climbs to 500mQ then insulation...
  2. P

    Socket voltage readings

    Hi all, Never seen this before. I am getting a red LED appearing on my socket tester without the socket being switched on, and then a 'No earth' from one socket tester but 'Live Neutral reverse' from another socket tester. I am also getting the following voltages at one of the sockets: Line to...
  3. B

    Multimeter false readings

    Friend had a multimeter, not a very dear one just £30, was testing an outside light and said he tested the whole light inside belled everything out and tested the ballast which has built in ignitor and came to use his multimeter and it’s coming up with weird readings could this be why?
  4. Jamie'

    What to do with high n-n continuity readings

    Hi guys, I'm currently in my last year of my apprenticeship and I think my boss has set me a challenge! I was at a house and got moved a few things around in the kitchen for a new kitchen to be fitted and also upgraded the fuse board so it had RCD protection. Now on one of the rings (ground...
  5. 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...
  6. 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...
  7. 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...
    • Gemma
    • Thread
    • readings through upstairs windows wiring
    • Replies: 88
    • Forum: UK Electrical Forum
  8. 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...
  9. 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
  10. 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...
  11. 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...
  12. 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...
    • Dave the spark
    • Thread
    • circuits earth high zs reading readings
    • Replies: 16
    • Forum: UK Electrical Forum
  13. 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...
  14. 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...
    • Joseph Lewis
    • Thread
    • circuit disconnect insulation insulation resistance insulation resistance testing lighting lighting circuit neutral neutrals readings resistance testing
    • Replies: 7
    • Forum: Commercial Electrical Advice
  15. 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 ??
  16. 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...
  17. 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...
    • Mattyi26
    • Thread
    • circuit readings result testing water
    • Replies: 10
    • Forum: UK Electrical Forum
  18. 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...
  19. 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...
  20. 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...
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