tn-c-s

  1. C

    Earthing Arrangement (TN-S or TN-C-S or a Frankenstein Creation?)

    Evening Chaps As can be seen in the attached photo , the incoming supply cable has a Earth soldered to the outer sheath of the cable suggesting an TN-S Earthing Arrangement, however a Main Earthing Conductor can be seen coming from the supply head to the MET suggesting a TN-C-S Earthing...
  2. M

    Is this TN-C-S or TN-C, also earth bonding size.

    I've tried to understand one way or another but this seems to be connected to the DNO fuse/cutout, and then loops down (out of sight) and comes back up to connect to the outer sheath. The bonding looks like 6mm^2. And the connection point looks like that's the max it will take. As I understand...
  3. O

    EV chargers and TN-C-S supply earthing general hassle

    Trying to understand why car chargers attract this earthing ballache. from what I learnt it's all about the rare times a Neutral / PEN conductor gets broken in a TN-C-S or thesedays most TN-S supplies. 1) If the PEN gets disconnected in the street, N and CPC become live making the car >70v...
  4. UnderstandingElectrics

    TN-C-S supply, shocks from earthed sink, latest test from landlord 200Mohm resistance between E/N

    TN-C-S supply, shocks/tingles from earthed sink. Latest NICEIC test (2017) from landlord shows 200Mohm resistance between E and N As above, do I have a floating neutral, is this causing a leak from N, via bonding on sink to true earth (solid kitchen floor)?
  5. P

    Safe isolation in the TN-C-S world

    While reading the IET articles there was one on the open PEN risk and now the DNOs are adding another step to "safe isolation" where they clamp the earth bond to check if there is diverted neutral current present before disconnecting anything related to that. The youtube video for this: TL;DR...
  6. B

    TN-C-S (PEN) RCBOs Discussion

    I'm currently planning for a CU upgrade on the domestic premises, and following previous advice on this forum, I was told that I should consider upgrading to a Type A RCBO CU. I have been doing a bit of reading and came across some confusing information, stating that an RCD would not work on a...
  7. M

    BS1363 Socket for 10A EV Charger on TN-C-S

    No doubt been done to death..Ive steered clear of EV charging to date..but.. scenario is block paved drive, TN-C-S, customer just wants an outside socket to plug the lead from his soon to be delivered hybrid. Undertood to be a 10A slow charger. Doesn't want the expense of a dedicated charging...
  8. M

    DNO UK power networks changed incoming overhead and now have PME TN-C-S but ccu connection to TT

    Hi all. I'm currently training as an electrician so would like your views on this for clarity and if I need to get someone in? I have just moved in to a new (very old) house and on inspection of the CCU I noticed the incoming service cable from the overhead was chard at the top of the dno head...
  9. snipersmith87

    Hot tub - TN-C-S

    Im after some advice regarding the earthing of a 32Amp hottub. I've yet to install one and am dubious about the risks associated. The supply is T-N-C-S. My plan is to put a seperate supply direct from origin via henleys to a 50amp MCB. 10mm 3c SWA approx 25m to a small wooden workshop. Within...
  10. P

    When TN-S is TN-C-S

    On another thread there was chat about the N-E voltage to be expected, so I decided to measure my flat out of curiosity as it appears to be TN-S. A brief history - my flat is a Victorian built 4+4 arrangement and when I moved in many years ago each flat was fed by MICC cables. Something like a...
  11. M

    TN-C-S with Ze higher than 0.35 ohms

    Hello! Where do I start to troubleshooting with issue of higher reading of Ze 0.45ohms with TN-C-S earthing arrangement. Thank you!
  12. C

    Earth Rods in TN-C-S and TN-S

    Why aren't earth rods required on a TN-C-S or TN-S supply? In the US earth rods are mandatory for both. Two earth rods if the first one is over 25 ohms. Here is how its typically done: View: https://youtu.be/4vxYXzNtE9A?t=3459 #6 copper (13.3mm2) is run from the neutral bar of the first...
  13. KeenPensioner

    Open PEN in TN-C-S

    I posted this in the DIY section and got little response which is unusual so I'm posting it here. Hope that's OK. I'm still learning so be gentle. I'm trying to understand the consequences of a broken PEN conductor downstream of the DNO service head. If I'm correct, this will cause all...
  14. KeenPensioner

    Broken PEN in TN-C-S

    I'm learning so be gentle. I'm trying to understand the consequences of a broken PEN conductor downstream of the DNO service head. If I'm correct, this will cause all exposed conductive parts to potentially rise to mains voltage but this voltage will be reduced by any parallel paths created by...
  15. EalingBadger

    The hoary old topic of PME, TN-C-S and earthing rods (not TT)

    Somewhere along the line I picked up a suggestion from a forum posting or two that the DNO does not like you to connect an earthing rod to his "earth" - even though it is effectively just creating yet another, local to your installation, earthing point for the multiple ones already assumed to...
  16. 1

    Max Zs @ 80% TN-C-S System

    Morning all, I'm currently finishing off my Lvl 3 C+G and I just need to finish off my design spreadsheet then I'll have completed it. I've one last column to fill in "Max Zs @80%" the design is based on a hotel using a TN-C-S supply. I'm just wanting to know where I can find this information...
  17. M

    Ze of 0.50 ohms on a TN-C-S system

    Hi. I’ve just tested a friends DB and it recorded a Ze of 0.50 ohms on a TN-C-S with an 80amp fuse is this ok. As the DNO state that the 0.35 ohms is for 100 amp..
  18. TonyJohnson

    TN-S or TN-C-S From this photo

    Hi, I undertsand this to be a TN-S system as the earthing arrangement comes along the SWA metal sheath surround but the Ze i got is 0.19 which falls out side the regs of 0.8. Chameleon Electrical -...
  19. p=iv

    Lost neutral and surge protectors (TN-C-S)

    Would a surge protector (on an RCD) circuit protect from a lost neutral overvoltage? I know that isn't the aim of them (transient spikes only rather than sustained overvoltage) but I am thinking it may be possible (although very alarming if there isn't a thermal fuse in the surge protector)...
  20. J

    Opinion on Supply System Type Wanted: TN-S or TN-C-S

    Hi - My first post to this forum. I am having a disagreement with another electrician on the type of the supply characteristics for a domestic installation, i.e. whether it is TN-S or TN-C-S. I have uploaded a photo of the cutout/supply head. To resolve the disagreement I suggested we ask...
    • jlrb
    • Thread
    • opinion supply system tn-c-s tn-s type wanted
    • Replies: 35
    • Forum: The Welcome Forum

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