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tn-s

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  1. E

    Earthing of TN-S: who should pay?

    Hi, first post here (and second time lucky posting!), hopefully after a bit of advice. We had a new consumer unit fitted and some additional work, the electrician then tested circuits and got a high earth reading. I think the reading was something in the region of 1.05 and it should be 0.8, he...
  2. E

    Earthing of TN-S: who should pay?

    Hi, first post here and after some advice hopefully. We had a new consumer unit fitted and some additional work, the electrician then tested circuits and got a high earth reading. I think the reading was something in the region of 1.05 and it should be 0.8, he said it was an issue with the...
  3. 1Justin

    Horse stable. would you TT or TN-S ?

    This is not quite “Agricultural and Horticultural”, - but has horses! DNO supply to an outbuilding (just a craft room, no animals). TN-S at head. This feeds metal clad barn containing horse(s). About 20M away. No metal floor grids, no other metal other than the cladding and local CPC's from...
  4. J

    tn-c-s and tn-s

    Earth joined to neutral at head and wire to sheaf on incoming ?
  5. R

    TN-S no earth

    hi guys, just done a EICR and am filling in the cert. I have never come across this before, I have no earth at all on the sheath clamp when carrying out Ze. Checked L to the clamp and only getting 5 volts. Im getting 12ohms Zs on all circuits obviously through the water and gas bonds. I must...
  6. J

    TN-S or TN-C-S

    Argument currently raging at work can only be settled on this forum. We are a large company who has our own 11kv transformers and switches.At each transformer,the star point of each is connected to earth.From these transformers,we are then fed a 5 wire 415v system,each wire being seperate. At...
  7. A

    TN-S high Ze

    Testing at a house today. The supply is a TN-S. Earth taken from lead incomer cable. First test with my Megger 1730 gave me Ze of 3.5 Ohms, way above the 0.8 Ohms. Cleaned up the earth clamp and tightened it up and improved the reading to 1.7 Ohms. Tested from the live in the fuseboard to the...
  8. M

    TN-S & TT on same installation what should I class it as?

    got a 16mm earthing conductor from main supply sheath goin in to the MET + an earth electrode(rod) next to the supply with a 10mm earthing conductor comin off it to the MET Should I class it as a TT system for test results and mark the EIC as TN-S & TT :nonod:
  9. rustynails

    Tn-S Earth adequacy

    Hi all, I wondered whether you think the earthing is adequate on this system, I personally don't think so. Any thoughts?
  10. R

    TT but TN-S earth clamp present

    Hi I'm fairly new to the forum and have a situation I've never came across before. I visited a customers house to quote for a new consumer unit, the existing installation is a wylex pop out MCB board metal clad with a 100 mA RCD main switch with the supply being TT. The earth rod is not visible...
  11. G

    TN-S Code Two??

    Was talking to a friend earlier about the number of installs i have been to recently with no main earth, he told me that the NICEIC are now saying any TN-S with no soldered connection (earth clamp on metal sheath etc) should be made into a TT and Code 2 it, bear in mind this is for a large...
  12. L

    TN-C-S or TN-S ???

    Came across this on a rewire, looks to me like a TN-C-S, but had SNE on the side as you can see, we thought as the sheathing was metal it could mean (seperate neutral & earth) and be a TN-S, never seen before and could just be coincidence, a point in the right direction would be handy, cheers.
  13. W

    TN-C-S? or TN-S? Can anyone help?

    Hi, a question from a learner!...In the photos attached (I hope!) you'll see an incoming domestic elec supply. I'm assuming it is TN-C-S...but can anyone explain what the green earthing cable is coming from the bottom of the box to a BS951 tag on the Lead supply pipe..is this simply part of the...
  14. HandySparks

    TN-C-S? No, TN-S.

    Thought this might interest some. Doing a CU change. Took a quick look at the supply head, saw the earth terminal on the side and assumed TN-C-S. When the chap from EDF turned up to change the meter and connect to my isolator, it turned out to be TN-S. It looks like the underground supply cable...
  15. D Skelton

    Spur to outbuilding TN-S

    I'm having a blonde moment here??? Supply is TN-S, technically, could you spur off an existing RFC in the house to provide power to an outbuilding as long as you don't export the earth??? Connecting the earth rod from the RCD SFCU in the outbuilding? If you can, this is not in a million years...
  16. I

    100mA Type S RCD on a TN-S supply

    Just wondered... Found 100mA time delayed RCD on a TN-S supply between meter and CU. Not mandatory, but there's nothing to say this should not be installed is there?
  17. R

    Tn-s 3 phase?

    Evening guys, I`m doing a small commercial job involving 2 x 3 Phase boards. The secondary board is 15 meters from first and is gonna supply up to potentially four 3 phase machines plus a ring main supplying portable single phase equipment. Help sizing the supply cable for the second DB. Not...
  18. Tuttle

    Main Protective Bonding (Domestic CU Change, TN-S supply)

    I've gone around in circles several times on this and I'm still not completely sure what the answer is ... generally speaking, when changing a domestic CU in a house that has a TN-S supply and 6mm2 main bonding (which is in good condition) is it necessary to upgrade the main bonding to 10mm2? I...
  19. G

    TN-S supply 4.2ohms, this is the solution from the DNO!

    I recorded a Ze on a TN-S supply as 4.2ohms. Consumer unit is an all insulation Wylex twin RCD unit. I spoke to the landlord of the property which was currently empty (now occupied) and told him he needs to contact the DNO with regards to the high Ze. They came to site and this was the result...
  20. ringer

    Which earthing system is this, TN-S or TN-CS?

    Came across this today. Initially thought it was TN-S then spotted the PME sticker and notice. If the green/yellow earthing conductor coming from the supply head to the MET is joined to the neutral inside the head, why have they left the original braid from the incoming sheath still attached to...

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