conductor

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  1. P

    High Zs on SWA Armour / New Earthing Conductor

    Hi all I am after some help/Advice if possible please A SWA sub main Distribution circuit has been given a Code 2 Rating on a recent EICR due to a high Zs of 2.8 ohms. The cable is 180 metres long and runs underground in ducting. The Install is from a few years ago when a new Substation was put...
  2. D

    confirmation of earthing conductor size

    Hi Guys just a quick question but what the hell do I put in confirmation of earthing conductor size when the earth is the swa
  3. leep82

    C.P.C in T&E as a live conductor

    I know the thread title sounds bad but hear me out. I have wired an intermediate switch set up with feed at one switch, switch wire at another and twin and earth as my strappers between to an intermediate switch. My customer wishes to use lightwave switches for the three posistions mentioned...
  4. C

    protective bonding conductor size

    Hi guys, I've questioned something at my workplace and after receiving my answer I'm not overly convinced and would like some other experienced gods to chime in :) On a new install in an existing property today I went to bond the Water and noticed it was already done, clearly many moons ago...
  5. B

    Main Earthing Conductor and Earthing System question.

    Hello all, Just a quick question regarding I+T that I wanted to get some clarification on: 1. I recently went to a job where the incoming cables from the street came up through a metal conduit from the ground and then ran through some metal trunking before terminating in three sealed fuses...
  6. GBDamo

    High integrity earthing.

    i understand the need, as I see it any circuit with a likelihood of more than 10 mA earth leakage should be subject to high integrity earthing. This requirement can be achieved by many methods and I can see the sense in some. Using RFCs instead of radials gives two paths so in the event of a...
  7. R

    Coordination between conductor and oveload devices

    A good memory trick for exam conditions for coordination Ib In Iz (Alphabet) the earlier letters are always lower in value than the earlier ones, saves remembering Ib < In In < Iz Ib < Iz
  8. kingeri

    Extraneous conductive part as bonding conductor

    Been nosying about at my brother's new house this week and fixing a few bits and bobs. The electrical installation mainly dates back to the early 80's at a guess and apart from a few broken accessories and a lack of RCD protection (now fixed) it has all checked out okay. PME earthing. Today...
  9. Andy78

    EICR - Undersized earthing conductor

    Doing inspections today and found a couple of properties with under sized earthing and bonding conductors. Earthing system is TNC-S and features 6mm earthing conductor and 6mm bonding conductors. I normally code 6mm bonding conductors as C3 and am happy to do so here too, but should I be coding...
  10. Jim90

    Circuit conductor query

    Hi Guys, I have an electrical installation certificate following a periodic and under the ‘circuit conductors csa’ CPC column, someone has put ‘MW’ Unsure what this person means by this. I was thinking like a conduit earthing system etc. Other columns show MICC and SWA under CPC so I can rule...
  11. J

    Supply conductor size for 8 bedroom Victorian house

    Hi folks, I've recently visited a large 8 bedroom Victorian house. It has a three phase supply. One of the phases feeds the main house, its wired through a 100 amp main switch/ isolator. The Suppliers Side is 25mm tails but the customers side to the main house consumer unit appears to be 16mm...
  12. J

    What code? bonding conductor

    A connector block has been used to extend a 10mm water bond, what code would you recommend? Thanks
  13. Pete999

    Pete's Videos MI single conductor termination

  14. Michaelwgroves

    Can you join Main Protective bonding conductor

    I have a 6mm main protective bonding conductor from a 1981 install; adiabatic equation says this is sufficient and no signs of thermal damage. (Discussed in separate thread). Gas was not bonded, it's a big job to run new cable so I've used redundant water bonding as now all plastic to bond gas...
  15. Marcus Vaughan

    6.0mm earthing conductor to MET on TNS

    Hello. I am carrying out an inspection on a domestic TN-S system. First observation is that I can see 16.0mm earthing conductor fro CU to MET - but then is steps down to 6.0mm connecting to the supply cable. This should be 16.0mm - shouldn't it? I am going by table 54.7 in the big yellow book...
  16. HappyHippyDad

    Finding a broken line conductor in a ring?

    Hello all. I haven't been posting for a while but I have been 'lurking' as Rpa put it :). Life gets in the way of things! I rarely come across a broken ring, but I now have a broken line conductor on a ring (or rather a poor connection somewhere) R1=1000ohms, R2=0.61ohms, can't member On but...
  17. leep82

    Upgrading earthing conductor

    I am in the process of pricing a DB change for a customer and am a little unsure as to what to do with the earthing conductor. The system is TT and the earthing conductor looks to be 6mm, tails are 16mm with a Ze of 47.7ohms. The main protective bonding conductors have already been upgraded to...
  18. P

    Cables with thermosetting insulation (XLPE cables)

    I understand that XLPE cables operate at a maximum temperature of 90c compared with 70c for PVC insulation. What I don't understand is why the increased temperature permits a reduction in conductor size if XLPE insulated cables are used in preference to cables having PVC insulation. If the...
  19. cliffed

    Main bonding Conductor

    Just your thoughts on this one,recently did a bit of work at a factory unit,there are several units being used by a company. The electrics are really pretty bad,my concern is main bonding of structural metal work,can't really see any Earth conductors to these. In the one area there are steels...
  20. L

    Connecting main protective bonding conductor into MET thoughts

    Any thoughts about connecting main protective bonding conductors into the MET instead of distribution boards? Watched a spark do it the other day and never really thought about it myself. Achieves the same result so it shouldn't be an issue.

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