measured

measured

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  1. I

    Voltage measured when breaker is off

    Hi ther I'm fitting a new IKEA kitchen for my father and have insta Ed a new cooker switch. When testing with cooker breaker off I was sill seeing 9.6v on my multimeter. As I individually switched other breakers off I saw the voltage decrease witheach breaker till i switched off the main...
  2. B

    TN-S High Ze measured 3 wire no trip.

    Hi knowledgeable collective. To the chase. TN-S Megger 1553 2 wire Ze 0.09 but was getting Zs on cooker cable 1.5 metre long using No trip 3 wire got 33.4ohms So went back through system right to isolator post meter and was still getting 33 ohm reading. So 2 wire uses higher current so might...
  3. R

    The measured value of loop Impedance for a circuit is 2.4 Ohms

    Hello trainee forum thank you very much for letting me in here and as a consequence hopefully helping me to develop my skills and knowledge. I'm currently focusing on the 2391 and have enrolled myself on a course with no previous Inspection and testing experience or Knowledge so I do feel kind...
  4. Steve888

    255V measured instead of 240V

    Hello while 255V seems to be a normal voltage for low voltage networks it causes issues to my solar installation where the inverter works up to 240V. Any idea why Western Power increased the voltage?
  5. S

    Measured kA on electraform EICS

    All, evening to you. I’ve started using electraform for doing certs. Doing an EICS and in the test results part there is a column next to measured Zs marked measured kA. I might be being special, but I’m not sure what I’d put in here for each circuit. Looking at my spare manually completed...
  6. Golden Graeme

    Minor works cert

    On the report is the earth fault loop impedance internal Zs or external Ze ?
  7. Karin

    resistance testing

    afternoon all, been reading up on testing and just wondering about the different types of testers and how they work.. insulation resistance - creates a potential difference across two conductors and measures leakage current to calculate resistance in MegOhms? low resistance ohmmeter - i've...
  8. R

    High Zs on ring final circuit

    Good morning, I was recently at a job and had a discussion with another Electrician regards a high Zs reading on a ring final circuit. R1+R2 measured 1.68ohm Ze 0.18 Tncs This puts the circuit over the permitted zs. I begun seeking out the issue. However the other electrican said...
  9. B

    Can you calculate ring final conductors if you have a measured R1 + R2?

    Hello there everyone, I've dead tested some ring mains on a job recently but unfortunately I didn't do my measured end to ends. The circuits only have two spurs on each. I have my R1 + R2's, it was wired in 4mm T and E so the earth is obviously 1.5mm. For example, if one circuit measured...
  10. L

    Measured Ze, measured R1 + R2 = 'measured' Zs

    Discussion/s to be had.....If one measures Ze, then measures R1+R2 at all points on circuit, would the result be a measured Zs....... What is the point of carrying out highly inaccurate 2 lead Zs tests which do not tally with 3 lead tests carried out on the same machine...... The earth fault...
  11. V

    NICEIC Certification Scheme Niceic cert

    Hi all i have been filling in NICEIC certs now for the past two months the way our firm work is to give out what they call a site sheet we test and fill in the results and all the information and then the QS looks over it and finalises it, I was given a completed cert fully printed out from our...
  12. G

    2394-5

    Q, The earth fault loop impendence measured for a circuit is L1.1 0.61 determine showing all calculations weather it complies with Bs7671 what do I need to do
  13. R

    Measured Zs just over regs!!!

    Can anyone give me the formula with ref to Appendix 14 of the regs?? Near the bottom of that page it says accurate calculation of Zs with respect to load current and conductor temp.thanks
  14. happysteve

    IR compliance - trainee (and mentors!) quiz

    Been reading up for my 2394/5 exams next week. Learnt some interesting stuff over the last few days. Thought I'd pose a simple quiz, as this was something that I misunderstood, and I'd be interested to find out if others do too (or if it was just me!) :) Just for fun, trainees and mentors can...
  15. P

    Earth Fault Loop Impedance

    Hi all, I am hoping someone can clarify if my understanding on earth fault loop impedance testing is correct. A low efli is needed so a protective decive can operate in the required time, the lower the z the quicker it will operate. ZE= External resistance from borad to supply, board...
  16. S

    max measured earth loop impedance query

    Hi guys, Im just filling in my first ever solo EIC when I check the onsite guide and gn3 for max permitted zs (tabulated) for bs60898 type b 32A the table shows 1.16ohms but to me it didnt ring a bell, checking bs7671 table 41.3 shows max zs to be 1.44. Can anyone shed some light on why and...
  17. L

    ZS measured higher than zs calculation

    I was wondering if anyone can help me out with this conundrum. I was testing a domestic property and tested a security alarm which was a 6A MCB not supplied by any RCD. Ze was 0.12 Ohms R1+R2 was 0.10 Ohms Now using the calculation I assumed the reading would be no greater than 0.22 Ohms...
  18. L

    High measured Zs values

    I have some remedial works to do on a fairly large commercial installation. The majority of the submains from the main panels are protected by 63 and 100A MCCBs, and as a results of a high Ze (0.24), a lot of the submains Zs’s don’t meet the regs figure. Replacing the cables is not an option...
  19. K

    Earth Fault Loop Impedence question

    hello, i got this qustion and would like someone to show me the working out of it please. the measured value of loop impedance for a circuit is 0.83 ohms. if the temperature at the time of the test was 20c and the cable is 70c (factor1.2), what is the correct value. ze = 0.4 ohms
  20. D

    problems with Zs testing

    Hi! I was measuring Zs on a lighting circuit some time ago. First I did R1+R2 and it was around 1.60, pretty high but there were a few connections on the way and most of the cable was 1.0mm. Ze measured at the CU was low about 0.10 only, so Zs altogether around 1.70. When I measured it using...

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