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conductor

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  1. P

    Main Earthing conductor size.

    I have a TNC-S System (PME) , with a 100A fuse, the main Earthing conductor is 10mm, terminated in an earth block, with main bonding conductors of 10mm. Tails to consumer unit are 25mm with 16mm earth. The Ze of main Earthing conductor is good. British gas put an isolator last year and at the...
  2. L

    Use of cpc as a live conductor - EICR Coding

    Fella's I'm just writing up an EICR from last month, one of the findings was a lighting circuit on the non RCD side of the board where the cpc was used as a strapper in 2 way light switching, Ive marked it as C2 for two reasons, one being that there is no longer a cpc in the cable and also that...
  3. S

    earthing conductor size

    Just tested a job where the supply to the house is 3phase via a 240mm 4core swa on a 160a 60947 MCCB, the Zs is 0.16. The earth is a 70mm seperate under ground and the armour of the cable is connected also, just trying to work out if this is acceptable? any thoughts?
  4. N

    Question regarding filling in the box for verification of Main bonding Conductor.

    Hi I am trying g to fill in the Electrical Installation Condition Report, section J. my question is regarding checking the boxes in the section Main protective Conductors. If I have a high value for main protective conductors say to incoming water. What happens to the box Connection /...
  5. Tuttle

    Minimum protective conductor size

    CU replacement ... existing ring mains (on 30A 3036 fuses) are wired in 2.5mm T&E with a 1.0mm cpc :sad_smile: I'm looking at Table B7 in the OSG which seems to say to me that the minimum protective conductor size is 1.5mm for a fault level up to 3kA on a class 3, 32A breaker. I've got a max...
  6. R

    Bonding issue upon upgrading fusebox.

    Was at a 3rd floor flat today on a TNC-S system fed from a communal intake using 16mm t&e. The job was to replace a light and wire in a fan to the bathroom. Carrying out the tests required to complete a MEIC i found the main switch at the fuse board was burnt out with some minor damage to the...
  7. G

    95 volts in an Earthing Conductor

    To make things worse the voltage is entering a shared Main Earthing Terminal from a separate premises with occupiers that don't seem to be that bothered about the situation. Things don't get better. In the section of the building which doesn't contribute to the voltage to the MET they've...
  8. richardg

    Earth doubling up as neutral conductor

    Good morning all, I was called out to diagnose a fault with some 2d robus light fittings. After some research it turned out the installers had programmed the PIR with the wrong time sequence (5mins) the tube and ballast were both being damaged as min run time should be 15mins. What stumped me is...
  9. D

    EICR in a church

    Well lads some advice if you please Looked for Quoting to do an EICR in a church with the following items from a PIR done 14 months ago. 1) Lightning conductor box on PIR cert was ✓ N/A. (It has a lightning conductor) my question is does the lightning conductor require connection to the MET...
  10. S

    Meter tails upgrade for assessment

    I will registering with elecsa soon and going to change c.u in my flat for assessment. Line conductor is 10mm,Earthing conductor is 10mm and bonding conductor is 6mm . I don't know cut out fuse size as it is sealed. The c.u. only has 6 circuits. O.S.G says these are minimum required. Do I need...
  11. O

    csa of protective conductor for swa cable

    Hi Guys, Just looking for some advice. I'm currently installing power to a workshop via a 16mm swa 3 core cable. The question is, what size protective conductor should i use for the swa at the supply end. The length of the run is approx 40 metres. Cheers,
  12. O

    Sizing of a Generators Earthing Conductor

    I’m goingto be installing some quite large Generators (1000 Amps plus on each phase) in the next few days will I need to size the EC to Table 54.7 or 54.8? I’m leaningto 54.7 as I think that would be safer, but am I correct or just wasting copper?
  13. M

    main earthing conductor

    Hi all I come across main earthing conductor coming out of fuse carrier which is 16mm earthing into henley block then 10mm out of henley block to main earth terminal in cu, ive been writing down 10mm as main earthing on test paper, would like to know what every1 else puts in this...
  14. spark-ticus

    200v on the earth conductor of my lighting circuit

    Hi folks, I have put a new light circuit in a domestic property and am finding 200v on the earth conductor which is tripping rcd as soon as l switch the breaker on. With the circuit in question dead with all 3 cores out of the cu I test between L+E and N+E but am getting no continuity as soon as...
  15. G

    Which paperwork?

    Hi again Getting certs together for my first Elecsa assesment. My project was a CU change at my brother's flat. Notified building control as advised and completed, tested, energised and filled out the certs. All good. Building control came and inspected the work and advised on some further...
  16. R

    How to size earth conductor of three phase generator

    75kva 3phase Maxcurrent per phase 108A Outgoing feeders from genset 4C 35mmsq cable + 16mmsq CPC Earth conductor from genset earth point to earth electrode = 50mmsq Question: why 50mmsq? Isnt 16mmsq sufficient since cpcs are sized at S/2 half of phase conductors. Are earth conductors to earth...
  17. P

    0.05 Max Impedance for Main Bonding Conductor

    Got massively ribbed on another post for not knowing that max impedance for a main bonding conductor is 0.05 ohms, so I expect some more for this post!....... I'm going to assume there is a very simple answer for this, but despite me going blind reading GN8 I can't for the life of me work out...
  18. B

    Bodging a touch current and protective conductor current test with a MFT

    Hello I have been asked to do a bunch of pat testing and I have a couple of questions that hopefully someone has an idea about. I have a Fluke MFT and a clamp meter and have built myself a socket lead which allows me to plug an appliance directly in to my tester. This allows me to do IR with...
  19. S

    Earthing conductor size for replacement DB

    Hi all, Got my part p assessment coming up with elecsa so decided to change an early 80s db in a 2 bed bungalow. It has a pme arrangement and a 10mm main earth and 25mm tails. Forgive my ignorance but will I be required to upgrade the earth to 16mm and if so can I connect it to a seperate met...
  20. M

    Main Bonding Conductor and other stuff

    I'm following, to do some maintenance at a works, where acontact electrician who is completing the re-wiring of the office area. The following came to my attention and wonder if the regs change so fast that Icannot remember which was the latest edition or amendment or whether everyelectrician is...

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