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  1. L

    Earthing Arrangements Explained + Photo's

    Well Dan,on your recommendation ,I decided to read this thread (all 12 pages of it). Very interesting.Feels a lot older than 10 years.It also raised a question for me ,based on the comment above from "Engineer54". He suggests that the metallic sheath of a TNS cable must be electrically isolated...
  2. L

    NIECEIC or Napit reg.

    In some European countries ,rcd,s have been mandatory since the 80,s.Other countries felt uncomfortable with the introduction of the rcd ,which delayed it's introduction (Holland and the UK for example).Why the rcd became a little controversial in some countries is a question I have no answer...
  3. L

    NIECEIC or Napit reg.

    Would that have been the norm for all sparks of your generation or were you ahead of the curve? I ask because when I first visited UK forum,s in the early naughties there was a noticeable dislike for rcd,s among British sparks.And even on this forum in more recent negative sentiments...
  4. L

    How to identify presence of an earth electrode

    No.The reg simply states that rods sank in "public areas" such as footpaths may be covered in after the initial inspection.Our understanding is that the "powers that be" are concerned about anything that might be utilised as a "trip hazard". Yes.Metal covered in concrete lasts for decades.From...
  5. L

    How to identify presence of an earth electrode

    here is where it gets interesting. You cannot ABSOLUTELY confirm that your reading confirms the presence of an earth rod.As you speculate, you could be getting a parallel reading.However ,realistically ,the only metallic services coming in to an Irish home since the 1990,s are....correct...
  6. L

    Cable sizing earthing conductor

    Just spotted this thread.Sinking earth rods is probably the average sparks least favourite pastime. There is no calculation involved .If you install a 16mm supply (in ROI) you are obliged to run a 16mm earth to the rod.10mm is more than adequate (4mm is actually more than adequate).But the...
  7. L

    How to identify presence of an earth electrode

    I have been mulling over your situation as I have recently been in the same predicament. We completed PIR,son 130 homes for a housing association all built between 2005 and 2019. Our single biggest challenge was the lack of earth inspection pits.The association insisted on "no remedial works...
  8. L

    How to identify presence of an earth electrode

    Unfortunately not.Another peculiarity of the TNC-S system is that an open PEN fault actually renders your rcd,s ineffective in protecting you should you touch any live metalwork. The rcd does,nt detect the fault current flowing through you as an imbalance.Your only protection will be in having a...
  9. L

    How to identify presence of an earth electrode

    It's to do with with reducing the "Touch voltage" under an Open PEN fault when all bonded meralwork in the home becomes live. There is a popular misconception that the rod can act as a " back up" when the DNO,s neutral breaks ,but this is not realistic with a standard single earth electrode.
  10. L

    How to identify presence of an earth electrode

    Instead of disconnecting the neutralising link I would disconnect the unknown remaining 10mm earth ,which you can be virtually certain is going to the earth electrode.Carry out an fli test on it and you will likely get a reading somewhere between 100 to 300 ohms. Though strictly speaking there...
  11. L

    Wago in-line push fit connectors

    I find this a little unhelpful that some push fit are designed to accept stranded and others are not.One standard push fit connector would be better. Undoing some pushfit connectors that have stranded cables renders the connector unusable (according to Wago,s instructions).Not helpful.Why a...
  12. L

    Bonding RSJ question.

    Yes.Perfectly fine from an electrical point of view.But your regs might require it to be a little bigger (4mm?) due to mechanical protection considerations."pc1966" is better placed than me to a swer that.
  13. L

    Bonding RSJ question.

    Correct.I always bond the metalwork to the CPC .I understood from the OP that he wondered about running a separate bonding cable to the metallic structure.
  14. L

    Bonding RSJ question.

    I would say yes,technically, as it can "introduce a potential ", if it's sitting directly on earth. But it differs from the conventional extraneous part in that it is introducing a potential to itself rather than other unrelated metalwork.It simultaneousely serves the purpose of been both...
  15. L

    Bonding RSJ question.

    Not necessarily.If there is no extraneous metalwork entering the container then in principle there is nothing to bond. It's no different from the metal sheds commonly erected nowadays.If there are no metalic services entering the shed (such as a water pipe) then there is nothing to bond.
  16. L

    A thought about fuses

    Thats a very interesting point .It would explain why these very same fans are installed all over the continent and are protected ,not by a 3 or 5 amp fuse ,but by the 16 amp circuit mcb.
  17. L

    A thought about fuses

    As far as I am aware manufacturer,s only seem to get away with this in Ireland and the UK only.In other countries manufacturers are expected to take care of this issue themselves by fusing the appliance internally
  18. L

    TN-C-S/Adiabatic help!

    Why would the distance to the PME,s electrode matter?.The general mass of earth is a conductor of negligable resistance.The usual considerations taken in to account are the resistances of each individual electrode (installation and PME,s) to the immediate ground they are sunk in to.Whether the...
  19. L

    Lucien Nunes Electrical Engineer Extraordinaire

    Amen to that brother
  20. L

    EICR & IR Testing so many cables

    With readings like that you most likely have an appliance still plugged in.Or there is a fixed appliance still in circuit . Its very difficult nowadays when carrying out EICR,s to have 100% of the circuits"clean".Invariably our low IR readings gradually improve as we isolate the "offending"...

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