tt earth
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tt earth

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  1. B

    Regarding TT earth system

    Hi How do i access the earth rod to service it, where abouts will it be located and does a tt system have upfront rcds which will be probably in another enclosure? cheers B
  2. T

    SWA Sub Main advice/comments

    Hi all, looking for a bit of advice and confirmation on my proposed plans for a SWA sub main to a ISO metal storage container. I've calculated the max demand in the ISO will be about 20A (300w of led lighting and 2 double sockets for chargers etc) It will be fed from a 3ph DB in another...
  3. M

    TT earth rod cable

    Hello, A friend of mine has a garage which is powered from an FCU on a ring final from his house, the garage is a little way from the house and is a TT earthing arrangement (the house PME earth is terminated in a plastic wiska box (where the SWA cable is terminated) and isolated from the...
  4. S

    UK Electric supply to new shed.. The main property is TT earth system.

    I propose to use a redundant shower supply that terminates in the attic. This will be connected to swa 4mm 3 core cable and run 45m to a new shed with a separate consumer unit with rcd and 1 6a and 1 20a breaker. I'm not proposing to have any high consumption equipment in the shed. My questions...
  5. Andy C

    TT earth, Dual RCD or RCBO and Main Switch

    I have a replacement consumer unit coming upon which is currently off a TT system with a nice low reading on the earth. There is no chance of the DNO converting to TNCS. No SPD or AFDD as per client. I intend fitting a new Dual RCD consumer unit. I have researched this site and there was talk...
  6. Diver233

    TT earth cable small and god knows where the rod is

    Just started to test a TT system, so found the earth and thought that cannot be it for the size of the house. (See pic). So tested the Ze and got 94 so less than a 100 but I thought I’d check the connections to the earth rod. Cannot find it anywhere. I can see a new main electric feed has been...
  7. Prytaneion

    TT Earth system tester

    I have to install a TT Earth Rod on a rural new installation. Can some kind sparky please point me in the direct of a hire company that will hire out a tester? My old megger 1502 won't do this and as there is no power on site at the moment, I need a battery powered tester for Ze.
  8. B

    TT earth results

    Hi I've been testing a garage installation and the house is quite remote and has a tt supply. The supply to the garage is swa supplied via a 32a mcb on a 30mA rcd main switch. The earth spike resistance is 21ohms. The earth fault loop impediance at the main switch is 22.1ohms. At the garage it...
  9. G

    TT earth electrode

    What is the max resistance at the time of installation permitted on customer earth rods in a TT supply?
  10. S

    dual rcd consumer unit on tt earth.

    Am I right in saying a duel rcd(plastic at present)cu can be used on a tt system without an upfront type S rcd incommer? Thanks for any replies,sw.
  11. D

    TT earth rod to shed or non connected garage..advice please

    Hi i have been trying to find in either the osg or regs book where it states that a shed or garage not connected to the house must use a TT earthing system instead of using the house PME, i have been told from a Niceic that it must be TT and also been told by elecsa that a PME is ok to use, so i...
  12. Simon-0116

    agricultural tt earth

    Just been to look at a job subing to grain drying firm to help then installing cables, lighting etc. The mains is 3ph in house, across newly tarmac to a small out house were it goes to db, then off to variouse sub dbs. The main swa from house is 16mm 4 core, swa as earth. ( No 300 / 500ma...
  13. Energetic

    Does a TT Earth 0.13Ohms require a 100mA incomer?

    Had an interesting one this week, customer assures me he's on TT, DNO days the same but i'm getting 0.13Ohms on the Ze, never seen it that low befor. There's no 100mA RCD on the supply and it doesn't look as if there's ever been one, so with that reading i'd assumed it was a TN system... so my...
  14. M

    tt earth voltage

    Hi If I disconnect earthing conductor and put a voltmeter between the earthing conductor and the earth rod how many volts should I expect? None I would have thought. However I get 60V with nothing plugged in and 110V with computer plugged in. Caravan on tt system fed from tncs property - ( no...
  15. C

    TT earth rod question

    Is it sufficient to just use a decent terminal cover on an earth rod or must it be protected by a proper inspection box?
  16. C

    TT Earth cable sizing

    Hi al, Just need a bit of a refresh regarding the sizing of the earth cable for a domestic installation with an earth spike. I believe 10mm for the gas & water bonding, but seem to recall that the main earth cable can also be 10mm?
  17. S

    Pointers on installing TT Earth Electrode on a construction site

    Hi, I've got to install an earth electrode on a construction site. It's just a house, and there is a PME supply, but no meter yet, EDF want the electrode installed. I've tried putting the electrode in the ground and then did an EFC test and got 64.8 ohm reading. Should the this reading be...
  18. O

    TT earth rod need to be visually verified?

    Hi all, just did my first PIR on a TT system and found an earthing conductor heading from the MET, under the floorboards and into the ground away from the ccu towards the house. Ze gave me 3.9 ohms. Question is: do i need to visually verify connection to a rod (if there is one!)...
  19. V

    TT Earth connection question

    Hi, need some advice on a TT earth path. House has CU in hall and a smaller CU in garage which is supplied with 6mm T&E from a 32A MCB in the house, the earth rod is connected into the garage CU then the cpc from the 6mm routes this into the house CU, is this OK or should I get the rod...
  20. U

    earth cable supplying tt earth spike

    I have looked at table 4.2 on page 29 OSG regarding cable conductor sizes supplying earth rod, but what size generally do u use for this purpose? i.e do u just run a 16mm everytime??:confused:

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