paths

paths

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  1. E

    Parallel earth paths and design

    Christmas crew, hope you all enjoying yourselfs. Ive been reading a thread on another forum about parallel paths. In certain installations, namely industrial/ some commercial, where the use of metal conduit, SWA, and steel framed building prevails. In such installs there is really is no way to...
  2. A

    Main bonding and parallel earth paths

    Hi all I was wondering if anyone could shed some light on an issue I cant seem to get my head around, say we had a metal socket earthed and a water pipe with main bonding, I touched the both of them in fault condition on socket (live touching metal box) now i understand the bonding puts the pipe...
  3. J

    Zs and parallel paths...

    Hi all, easy question I’m sure, so hope someone can clear up for me. If there are parallel paths on a circuit upon which Zs is being measured, will the parallel path cause the Zs to go up or down, and could someone explain why this would be so at all? I just need a clear understanding of this...
  4. C

    Career paths

    Bit of info about me first of all im 18 on an electrical installation apprenticeship doing my level 3 this September got all distinctions in level 2 B in maths A in all sciences Just wondering once i have qualified what other qualifications should i go after and what is the highest paid...
  5. D

    Parallel paths on R1 + R2 test

    Hi there Doing some testing at moment. R1 + R2 readings coming in lower than R1 + Rn. Cpc neutral and live all disconnected. There is alot of containment on job and adaptable boxes are all fly leaded to earth. My thoughts are they are parallel earth paths but guy working with seems to think...
  6. G

    An old newbie forced to change paths

    hi guys I hope I can give you a bit of back ground then you'll all see my situation, I ve spent a long while as a motorcycle mechanic ( when I was much younger) I spent ten years as a have 1 driver and I have just spent the last nine years working in social housing, unfortunately I have been...
  7. 1

    eicr

    Hi guys R1+R2 on a eicr mates tutor on the 2395 course said no need to carry out just zs is enough and on ring just end to end readings what's everyone's thoughts on this
  8. M

    TT systems parallel earth paths

    Good Morning Gentleman i have recently been testing house all of which are overhead supplies fed and the bog standard earth rod installation however we had some serious earth path issues with a39 ohm earth rod when combined with the bonding taking it down to 0.27 ohms almost tncs then the...
  9. P

    Urgent - Earth Fault Loop Paths

    Good morning, I'm wondering if someone could help with explaining EARTH FAULT LOOP PATHS in a competent way for TT, TN-S, TN-C-S systems. I can draw them on a diagram however find it difficult to explain things. I'm currently doing a HND in Electrical Engineering and unfortunately have poor...
  10. S

    Seems quiet tonight, so...

    Given a chessboard (8 x 8 square grid) and a piece which is only allowed to move one square upwards or rightwards (it cannot move diagonally, downwards or left). The piece starts in the bottom left corner of the board and you have to move it to the top right corner. There are clearly lots of...
  11. J

    Career paths

    Hi all, just wanted some advice as to what career paths you can move into with the skills and knowledge you gain as a spark. Line access and saturation diving looks interesting, but can't find much else in regards to options. For example, could you move into aviation maintenance? What about...
  12. 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...
  13. A

    Ring Final Circuit Problem

    Hi all hope you can help had a spur to fit on an old ring final circuit today that is made up of the old 3092 and old twin and earth were it has been extended in the past the readings i got end to end L 0.16 N 0.16 E 0.32 added together 0.16+0.32/4 = 0.12 but when i carried out a figure of 8 i...
  14. S

    Fault paths question

    Hi all, I've a question about fault paths. I understand that the earth fault loop impedance is measured during testing so that it can be compared to the maximum value in the regs and adjusted to 80% to compensate for temperature under load conditions, but what if the fault is a short circuit...
  15. H

    Series and Parallel

    Hi everyone, first of all great site with some real great answers on here. I have a question which might sound silly but can't get my head around it. Series and parallel. Can anyone give me a practical real world example of the two? I've got my 2391 next month and I really don't understand what...
  16. 4

    Parallel paths headache.

    Hi guys, I've spent the last few weeks reading through the site and have got to say I'm very impressed with the patience and knowledge you all have. This topic has been discussed and i'm sorry for bringing it up again but I would still like your opinion on the way I test and record my Zs...
  17. S

    Earth fault loop paths.

    Hello all, I am looking for some very clear diagrams of the TT, TNCS, and TNS efli paths like in the BRB etc, these are for my students. i would like them without text if poss and in colour PM me for email address if you can help. I would draw them myself, but art is not my strong point...
  18. J

    method of finding R1+ R2 of circuit

    Why is Zs-Ze not a approved method of determing the R1/R2 of a circuit
  19. M

    courses & career paths?

    I have the opportunity to get additional qualifications/training paid for by an insurance claim due to the injurys I sustained in a work related accident. I have got the ball rolling and will start the 2391-20 design & verification course this week, my previous qualifications are; 16th ed...
  20. B

    RCD question

    Hi people can anyone tell me the difference between the tripping currents and the current ratings of rcds.Any help I would be thankful of

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