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earthing

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  1. kediss

    UK Backup 106A generator earthing arrangement questions

    5 single phases to one huge property. Backup generator which can take about 106 amps split between 2 phases - 1 phase will be wired through the 2 pole ats which has been pre installed with the earths linking through to the pme system ( think for a 32a backup generator ) and then the other...
  2. R

    Cottage supplied by 16mm SWA 300+ yards! Trying to resolve a high Ze reading

    Hi, while carrying out an EICR at a farm cottage on Friday i came up against a problem early on. Whilst measuring the Ze the reading i obtained was 0.97 Ohms and 27Amps Pfc. Now the earthing system itself is quite strange. Next to the consumer unit is an old service head holding a 60A BS 88...
  3. R

    Shed wiring- earthing

    I've wired some cable to a small 3x3 shed with 2 gpos, a 15a GPO, and a light. The shed is about 2m away from the house on a concrete slab. The 15a gpo (4mm) is run back to the house mbox location currently coiled above in the roofspace. The light (1mm) and gpos (2.5mm) are run to the house...
  4. JanaWick

    How to calculate the effect of ground Enhansing material (GEM) in Earthing

    Can anyone advice me on how to take in the effect of Ground Enhansing Material (GEM) used in Electrical Earthing to reduse the earth resistance? in all the suppliers specification they only mension the GEM reduse the soil resistance drastically? so should i consider 1/5th,ro 1/10th or 1/100th...
  5. 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...
  6. K

    Should outside earthing wire be covered?

    Hi All, I own a country Villa out in the Spain countryside. Was having problems with water pressure so local tradesmen advised to get a water tank and pump, he has installed this in the garage, and that has helped. However, the electrical circuit in the garage is an old circuit and wasn't...
  7. N

    Best practice earthing metal plates and/or back boxes - fly lead or not?

    Hello everyone, Following on from my previous post where I received advice on taking a spur off a 40a feed (thank you). I performed the work today, installing a surface fixed metal faceplate and back box. When terminating to create the spur (tight fit into terminals with both 6mm and 2.5mm!)...
  8. D

    am2 resit tommorrow swa/ sy earthing

    resitting Saturday my am2 4 sections a3/b/d/e swa and sy failed on protective conductors on both swa i under stand thats the earths i think i used a smaller fly lead from the banjo to the db/ and a earthing nut with the banjo sy think i used a 1.5mm flylead so correct me if im...
  9. O

    High integrity socket earthing

    2nd fixing some sockets in an office today and we were talking about high integrity earthing, I've not got a clue what the sockets are going to supply, I'm guessing PC's, monitors, that sort of thing. There aren't any specs for the job so we just wired them as you normally would, I was trying to...
  10. Calebp43

    What earthing system have we got here?

    Went to a house to extend a circuit and upon doing the minor works I couldn't figure the earthing system. There was no DNO cutout and L and N came from overhead powerlines. I followed the main earth cable down and it went half a foot below the consumer unit to a connector block with 3 small...
  11. J

    Help with Solar pv earthing

    Hi all - I’m new to Solar PV, builder we do work for has fitted some integrated panels on his garage roof, there is a velux window nearby. Does this require earthing?
  12. B

    What crimp for 10mm fly lead to earthing nut ?

    Hi, I have always used banjos when earthing the armour on an SWA but have now switched to earthing nuts. I am making off a 10mm fly lead to the earthing nut (using 10mm to match the line conductor size as is good practice). Can't find any ring crimps that will take 10mm cable but have a lug hole...
  13. S

    IR testing steel conduit on 1st fix?

    Hi everyone, I'm nearly on my AM2 test and really enjoy the industrial side of things so I thought I'd learn by asking. I recently came across this note about IR testing PRIOR to connection? Can someone just explain how you would test if there was steel conduit and the earthing arrangement...
  14. F

    Earthing and Bonding sizing.

    Morning All, Think I'm having a brain fart but I have a 70mm2 4 core SWA with a separate 35mm2 CPC. Earthing is TNS with main bonding requirements being 25mm2. Using table 54.7 - CPC is half of line conductor so 35mm2. Am I correct in thinking the 35mm2 conductor is adequate for both CPC and...
  15. R

    Circuits earthed on metal box/conduit: Does it need a rewire?

    I'm getting an old fuse board upgraded in an office block. The electrician has just told me that most of the circuits don't have earth cables coming directly from the fuse box. I've taken a photo of one of the light switches. (attached to post) 1. It has the earth attached to the metal switch...
  16. B

    Is the earthing system TNCS or TT

    Carrying out a EICR in a commercial setting. In the main intake room the DNO supply comes in and it states clearly this is a PME system. 5 years ago it had a 120mm earth from the head going on to the MET which then had separate earths to each isolator on the panel. Within that time a new pumping...
  17. mak

    Question about earthing the armour of SWA

    If cpc core is present i.e. it's either 5 core three phase or 3 core single phase — is a banjo connected with a brass screw into steel trunking adequate to earth the armour(provided trunking is earthed to the earth bar)? Or would you put fly leads in between then a fly lead to an earth bar? Thanks.
  18. D

    TNCS or TNS earthing arrangement?

    Please can someone explain if this is a TNCS or a TNS earthing arrangement because it looks like both to me. Old undersized main bonding conductor goes into the neutral block first then to an earth block that's connected to the incoming cables sheath. My rather unhelpful supervisor told me to...
  19. M

    UK Earthing back to neighbours in terrace?

    Been asked to do some rewiring, and have said needs upgrade of consumer unit really Main question is regarding earthing - Zs reads at 0.45 ohms (which suggests at TNS) But cannot see where earth cable goes to from old fuseboard. There is no earth to fuse carrier or cable to fuse carrier in...
  20. N

    Cat6a cabinet earthing

    Hi all. I am replacing some cat5e cable with cat6a shielded in a large building. I have noticed the cabinets are NOT earthed and the electrical maintenance team have said they can provide this but have asked can it come from the local electrical board OR the MET. Do all cabs need to be earthed...

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