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  1. T

    Pat testing - low insulation reading

    Hi all, recently pat tested abit of equipment, it contains 24v power supplies, a frequency inverter, relays and a motor, its on a 13amp plug so requires pat test, however we get a low LN to E reading unless we disconnect the inverter. Reading is 0.9Mohms, is this normal or should you still...
  2. R

    IR reading

    I was called to a tripped rcbo on a lighting circuit. Using my megger 1721 I checked continuity between N and E but noticed an induced voltage of around 15V. Same across L and E. When I did IR checks the readings fluctuated between 1 and 90M and eventually the meter showed ‘Error’ and had to be...
  3. T

    Metal back boxs and r2 reading

    Might be a dumb question, but do metal back boxs have an effect on the R2 reading I feel like they dont as when you times r1 or rn by 1.67 you get the expected r2 of the cable
  4. A

    Help with Low insulation resistance reading

    Hello everyone, Hope you're all well. I'm carrying out an overall/global insulation resistance test on a newly wired 3 phase installation we did recently. I joined all 3 phase together to neutral and tested from the busbar to earth. I'm getting a reading of 1.33MOhms, and here in Ireland, we...
  5. S

    Hi Ze Reading

    2 bedroom annex at least 100m from main supply on 16mm 2 core swa with armour as earth and Ze of 2.42. Thinking easiest option to intall earth rod to improve.
  6. S

    Why I get only one phase reading current while rest are zero

    Hi I have UPS 50KVA and the inverter output AC voltage is feeding a distribution panel 120/208 V 4 wires when I check UPS display it shows me that output current which is the distribution panel phases as followings phase one = 30A while Phase 2 = 0A and phase 3 = 0A is this a problem !? Shall...
  7. naylorpd

    EICR needed in Reading

    I need an EICR done on a house I rent out in Reading, England - 4-bed detached built in early 1980s. Would ideally like someone from this forum. Last EICR was in March 2019 following which esteemed forum member Wilko put in a new DB, did various fault finding, earth upgrades and everything else...
  8. R

    Cottage supplied by 16mm SWA 300+ yards! Trying to resolve a high Ze reading

    Hi, while carrying out an EICR at a farm cottage on Friday i came up against a problem early on. Whilst measuring the Ze the reading i obtained was 0.97 Ohms and 27Amps Pfc. Now the earthing system itself is quite strange. Next to the consumer unit is an old service head holding a 60A BS 88...
  9. C

    Advice on reduced live-neutral reading

    Hello, I'm not an electrician, more one of those 'competent DIYers', so probably the worst kind :) My electric shower broke, the shower firm came out, he was in about 2 minutes I'd say. In that time he put his meter on the terminal block, said there was only a small 60v neutral-live, 190v on...
  10. M

    High Ze reading fails EICR

    Hello there. I've been looking around here and found some conflicting information. I have a question if I may ask. I had an electrician come over to perform an EICR, and all the installations were in good nic. However, he said that the Ze measurement was 14.5 Ohms on a TNS system, so he refused...
  11. T

    no end to end reading for r1

    Hi All, Had a weird one this morning during an EICR. Testing a ring final circuit in a 2 bed flat… kitchen was on a separate ring. With only the 32A MCB on, I identified 8 sockets on the circuit. Set up for dead testing… r1 end to end - open circuit. rn - 0.35, r2 - 0.57. Opened up the 8...
  12. O

    Low insulation reading at 500V

    Slightly strange one this, replaced a few socket fronts in a dining room today, all wiring original but new plasterboard on a studded wall. Its a ring final circuit which does the rest of the house apart from the kitchen. R1 and R2 all ok etc, loop test fine but doing the insulation resistance...
  13. 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...
  14. I

    TT System with TNS reading

    Shop with no earth coming from head, overhead lines in sight everywhere - definitely no earth from the DNO. Two 10mm earths going into the DB. One going to the water and another which disappears through a wall somewhere heading towards an external area never to be seen again. Customer doesn’t...
  15. K

    voltage reading on the output AND input of the solar panel battery controller?

    any idea why do I get the same voltage reading on the output AND input of the solar panel battery controller?
  16. mattg4321

    Room thermostat reading high

    I recently fitted a Heatmiser Neostat for a customer in their hall- to control their radiators throughout the house (70’s 4 bed medium sized detached). Quite bizarrely the thermostat is reading 3 or so degrees above the actual temperature when the lounge/hall door is open. Ie stat shows 22...
  17. Q

    Max ZS - Help reading curves

    Hi All, As ever another question regarding Max ZS! I just need help reading these curves and getting my head around them. Data sheets confuse me and overload me with information. So I have a Terasaki S800-NE MCCB Here is the Datasheet...
  18. R

    False reading on analog instrument

    Hello everyone, I'm a service engineer from Malaysia and come across a simple problem. I work with instrumentation and the problem I face with is regarding a Dissolve Oxygen Sensor. The sensor is used to measure oxygen in a sewage treatment plant by means of chemical reduction in its membrane...
  19. O

    Getting strange reading when I test a recepticle

    I have moved back to my house i was born in some 60+ years ago. Most of the original house's electrical receptacles are 2 prong with the center screw that holds the cover plate on as ground. They all test, OK. My parents had an addition installed on the second floor sometime around the mid to...
  20. OnlQQker

    What does this reading mean on a multi meter -0.00

    So checking for voltage on a brake light today on a Ford Transit 2016 custom. The drivers side is ok, the passenger side came up no voltage and gave a reading of -0.00. Multi meter set to 20v DC When keys are out of ignition the reading was 0.00 without the minus in front of it. I did try the...

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