tn-s | Page 2

tn-s

Recent contents View information Top users
  1. R

    TN-S ZE 1.27 Ohms, previous cert shows 0.15

    Just arrived at a job where a new consumer unit was installed by a previous electrician in 2010 Ive finished some garden lighting and started testing supply and I'm getting a reading of 2.7Ohms Ze and 1.08PFC this is a TN-S earthing system Previous test sheet on the consumer unit was 0.15 Ze...
  2. B

    TNS system or not what do you think?

    Hi guys Shouldn’t this have an earth? I’ve tried to add a picture but to be honest I’ve no idea how lol Thanks
  3. J

    Possible problem with supply earth connection on TN-S system

    Long time reader, first time poster. We moved house about a year ago and had an EICR carried out before purchasing. Everything checked out fine but with a some C3 recommendations for improvement. The power supply to the house comes up through the floor in the cupboard under the stairs...
  4. C

    Old TN-S supply too cautions??

    Hello guys Turned up to a job today and carried out the usual checks on the earthing system before i began work and found the supply authorities earthing conductor had been a piece of 1.5mm bare cable wrapped around the outside of the SWA, it looked like a real bodge job. I said to the client...
  5. 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...
  6. L

    Standby Generator Earthing (TT or TN-S)

    Hi Everyone The utility supply for an installation is of TT system. The Generator start point is connected to the its frame and earthed to an electrode. Thus, the installation has its own earthing electrode. I would like to know whether the installation is a TT or TN-S system when the standby...
  7. A

    RCCB 100a type s on a TN-S

    i come across this today and it does not sit well with me. so im after a little advice. its a TN-S system Ze 0.12 and Zsdb 0.16 there a type S 100A rccb as a main switch with no RCD's up stream, This does not sound right to me and all the MCB's are C type. all my I.R were greater than 2k except...
  8. S

    High EFLI on TN-S, DNO won't fix

    Hi all Firstly, I'm not an electrician but have found these forums extremely helpful reading over the last couple of weeks due to a running battle I've been having with UK Power Networks. Hoping some of the experts on here might be able to shed some light on the below... I recently arranged...
  9. D

    No MET at TN-S supply?

    Been asked to carry out a fuseboard change and various other remedial works in a house that is to be rented out. Everything seems pretty straight forward however there is not a main earth terminal to speak of, just 3 earth cables conected to the SWA - see pic. Is this a common occurrence in...
  10. Golden Graeme

    Earth requirements for TN-S with RCD 30ma main switch

    Hi, I am newly qualified and didn't really cover this scenario. I am a little unsure, so some advice would be great. I have an old installation that has a 6mm earth cable from the DNO TN-S to the consumer unit earth bar. The consumer unit main switch is a combined 100A and 30mA switch. This...
  11. stummish

    TN-S Main Earth

    Hi, I have just completed an EICR on a house my In-laws have just bought (I actually get on very well with them, so I'd like them to be safe) The EICR was an Unsatisfactory for various other reasons, some of which I will be solving with a CU swap. my main problem is with the Main Earth. I'm...
  12. charlie76

    TN-S No Main Earth Terminal

    Evening All. I am about to carry out a domestic rewire to a property which has TNS earthing. The DNO has recently done a bit of work installing a new isolator, smart meter, contractor for Econ 7 switching etc and tidied up their end of things a bit. There is no MET at present and everything...
  13. Z

    Earthing arrangement when moving consumer unit far away from TN-S supply?

    I've been doing a lot of research, and am hearing a lot of conflicting information on this subject. Currently working on an important job and want to get this perfect, and the time is coming soon to connect the new consumer unit up to the supply, so would be interested to get some more feedback...
  14. T

    TN-S (and one of those garage questions you love - this time for an EV chargepoint)

    Hi, Welcome to my domestic supply, the product of many electricians some qualified, some employed by builders over the years undoubtedly less so! - can somebody please confirm if this is TN-S please (lead incoming cable) Also, although I dont make a habit of looking at it - is this the...
  15. S

    TN-S Earthing

    Hi all, Just a quick one. Forgive me as I am not a domestic electrician so do not see many household TN-S cut outs. Is it or was it normal practice to group a portion of the SWA of the incoming cable straight into the m.e.t. It's just the total CSA of the SWA looks significantly smaller...
  16. HappyHippyDad

    TN-S with a BS951 clamp and black tar covering supply cable?

    Afternoon all.. I have just completed an EICR and came across the following : 1. Is the black tarry substance Pitch? The homeowner is unsure how long it has been there, however it is not completely solid and is slightly sticky to touch indicating that it is still getting too hot at times and...
  17. G

    TN-S Earthing

    Are earth rods or earth electrodes required for TN-S supply?
  18. J

    meter tails for TN-S system

    I am currently pricing up a job which only have 16mm2 meter tails which need upgrading to 25mm2 but I've been told the earthing conductor can be 16mm2 but i always thought it had to be 25mm2 can anyone clarify what size is needed!:49:
  19. D

    TN-S or TNC-S or both??

    Hi guys, weve been having trouble identifying the supply supply type at a building were we are carrying out the installation of EV charge points and it's obviously important we get it right as it will derermine wether we have to install earth electrodes for the charge points. it is a large...
  20. R

    Ze result on a TN-S strangely higher than normal.

    Attended a 1st floor flat in a council block today and found a supply head inside a mantel cabinet where the earth was connected around the outside of a conduit housing the main supply cables before going into the cutout. Also coming out of the bottom of the cutout was another 6mm2 earth which...

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Electrical Goods - Electrical Tools - Brand Names Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc

YOUR Unread Posts

This website was designed, optimised and is hosted by untold.media Operating under the name Untold Media since 2001.
Back
Top