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tn-c-s

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  1. P

    TN-C-S or TT?

    Could anybody help me with this? I'm starting a re-wire of an old property that has an overhead incoming supply. I've pulled the main fuse and there is a live & neutral supply, then the earth is taken from the neutral block (TN-C-S, right?). The problem I have is that I spoke to another...
  2. La Poste

    Protection against a lost neutral in TN-C-S

    I'm just having a little think to myself (I know it's dangerous) and have a quick question. Say for instance you lived in another country with overhead power lines, just Line and Neutral and you wanted to make a safe electrical system for your home. One method could be to put a nice big rod...
  3. W

    TN-C-S High Ze

    I recently completed a report on an exsisting Installation - TN-C-S Two 400mm SWA Supply cables with 185mm Earth and 1250A ACB Reading of Ze was 0.22 ohms. Although not over the maximum permitted it means all Zs readings for submains circuits ARE over the maximum permitted. The smallest...
  4. La Poste

    Diy TN-C-S

    Greetings all. I have been working with my electrical Boss this week and he was telling me about this guy he knew who had a habit of just joining the earth and neutral on any system that had no earth, thankfully this was quite a long time ago and the gentleman has since retired. So for...
  5. S

    Tn-c-s how the combined bit works

    I need a dummy's explanation of how the earth and neatral are combined and how they are split. Cheers
  6. Z

    Learner's question - TT supply for garage containing services from main house TN-C-S

    I wonder if anyone could help me understand how to deal with the extraneous-conductive-parts in the following (theoretical) scenario, modified from a practice question for the C&G 2391: The occupier of a domestic property has decided to have a new electrical supply to a steel framed garage...
  7. W

    Tn-c-s pme

    Visited a house last week to correct a supplier fitted RCD in the tails that they had wired incorrectly. Supply tails on wrong side of RCD. Current supply is TT but post in garden indicates that PME supply is available. Place needs a 17th board and total rewire which will be done in Nov but...
  8. S

    TN-C-S / Pyro / Outbuilding Upgrade

    Hi, bit of a job with scope creep going on. "Oooo it's so good we've found a nice electrician we can get all these things done that we've wanted for years". Client wants new outside lights on garage but existing isolation and circuit protection supplying garage is falling apart so that needs...
  9. P

    TN-C-S or TN-S?

    Hi everyone, Just wanting to confirm something, could you please let me know if these pictures are describing a TN-S or TN-C-S system? Thanks in advance
  10. E

    TN-S or TN-C-S

    Morning all, The earthling arrangements in our house have what looks like a TN-C-S distributors cut out enclosure but has no earth wire where the earth wire should be. Instead there is a small cut-out on the bottom left corner and what looks like 5 or 6 heavy strands of uninsulated copper...
  11. M

    TN-S or TN-C-S?

    Whilst having a quick nosy at my mum's supply I came across a recent installation certificate that was left when her new central heating system was fitted. Before reading the certificate, I was of the opinion it was a TN-C-S supply. However, according to the certificate, they noted it as a TN-S...
  12. S

    TN-C-S Confirmation

    Hi, [introduction in new members section] We have a CU to fit to replace a re-wireable fuse board. The incomers are pretty new and look to have been fitted fairly recently. However it looks like a tn-c-s with one major missing factor... No earth block from the incoming Neutral. There's no...
  13. ringer

    Why can you not use TN-C-S in special locations that are outdoors?

    Looking in BS7671 at Part 7, Special Locations, in those involving circuits that are typically run outdoors, TN-C-S is specifically excluded in preference of TN-S or TT. So why is TN-C-S specifically excluded? I know the ESQCR is quoted, but want to understand why the ESQCR makes this...
  14. P

    TT or TN-C-S?

    went to a property last week. main intake off a transformer on pole but when SWA enters cutout fuse line, neutral + earth supplied from supply authority. I would say TN-C-S? Am i right? any ways main question is there is a 10 way single phase board non RCD protected but they guy is...
  15. C

    Certificating distribution circuit which is TN-C-S one end and TT the other?

    Having recently installed a submain, sheath to TN-C-S earth at supply end, isolated and TT'd at the far end I'm a bit unsure on the cert. I have ticked both earthing types but am stuck on how to separate the values for each installation to put them on the same cert. Max Ze for example, should...
  16. V

    TT convert to TN-C-S yes....no....yes....no....!!!

    OK I know it's been thrashed out, still cant decide! Currently TT with overhead, DNO reports PME available. So...what I have discovered.... PME has 2 protectors for earth fault MCB & RCD, TT only has RCD - PME wins All bonding to be upgraded to 16mm for PME - TT wins DNO to maintain earth -...
  17. J

    Help needed asap regarding TN-C-S earthing

    Hopefully someone can help. Bascially my freind bought a house and its a P.M.E system coming in to the property, But there is no direct earth connection on the cut out only a earth rod. I know this is not correct for a P.M.E system but will it suffice or do you suggest running a new earth from...
  18. S

    TN-S or TN-C-S

    Have I got this correct "It is not permissible to install TN-C-S (PME) systems in petrol stations or large arenas and stadiums, for this reason and for standardisation, all new installations will be TN-S." It flies in the face of logic that a PME system is less safe than TN-S, can...
  19. K

    TN-C-S supply to contruction site

    I have been asked to provide a supply to 2 x containers on a contruction site (1 for materials 1 for tea hut) with sockets for battery chargers etc. The supply at the house to be refurbed/extended is TN-C-S. Reg 704.411.3.1 prohibits use of TN-C-S unless to a fixed building. Could...
  20. N

    TN-S vv TN-C-S

    I'm interested in collating the differences in the requirements (not the definitions) between TN-S and TN-C-S. I've aleady seen an example in another post tonight: "TN-S Ze max is 0.8", Any other quotes (with regs reference if possible)?

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