earthing

earthing

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  1. O

    Earthing at a light switch

    My flat has been rewired, the old light switches have been replaced but the original metal box recessed into the wall and still in situ did not have an earth terminal. the electrician has renewed the wiring with twin and earth but just the earth loose with green sleeving over it. ie not...
  2. T

    Earthing, Metals and different voltages during faults

    forum erroneous post removed
  3. H

    earthing switches

    Is it acceptable to put plastic screws in switches when there is no earthing to them to satisfy eicr?
  4. N

    Earthing flexible water pipe

    Hi All, I'm not an electrician (this will soon become apparent), but I am a homeowner with an electrical query. Several years back I had a bathroom renovation done, which amongst other things, resulted in some copper pipe suppling my basin to be replaced with flexible hose. The earthing/bonding...
  5. T

    SY cable - earthing the braiding

    Hi all, we have a situation where we have a 3 phase bit of equipment thats on a 32amp commando plug 3 phase. Its wired up in sy cable and using an sy gland the braiding is earthed on the load side. There is no room in the plug (supply side) to get both the braiding pigtailed up and the conductor...
  6. MaintenanceSpark

    Earthing Armour with BS951 clamps?

    I was replacing a socket that had a cracked face and as I took said socket off I noticed the armour was earthed by using BS951 clamps. I wasn’t expecting to see any earthing of the armour as the SWA was in a conduit drop to the socket. I’ve never seen it done like that before but now I walk...
  7. J

    Generator Earthing

    We’ve recently completed the first and second fix of a barn conversion that is off grid with solar PV, batteries and a back up generator. This was always the case that it was going to be off grid however as we have little experience in working with any off grid systems we specifically said at...
  8. J

    3 phase TPN boards - earthing TT

    Hi guys, starting a new install on a job soon and having a complete mind blank. The supply at the main cut-out is a 3 phase TNCS supply. There is then a 50mm SWA running a considerable distance to a workshop where i will be installing a new TPN board as well as an earth rod to make all the...
  9. P

    Earthing SWA at lampposts with plastic fuse enclosures ?

    Hi All, Just finished testing lamp post supplies pre LED upgrade for a company where the measured Zs exceeds maximum permitted on all circuits. DB change is in the pipeline but brings its own issues with inrush current and what type of MCB to utilise due to the poor Zs readings. Current earth...
  10. Charlie_Don't_Surf

    BS 7671 Query - Earthing of line conductors

    I'm working my way through the BS 7671 handbook and the course I've bought which accompanies the exam, in preparation for the latter. I have now come across, in a couple of places, regulations which require under some circumstances, for line conductors to be earthed. for example: "411.4.2 The...
  11. P

    Earthing on wooden shed

    Hi all, just a quick one on an earthing arrangement for a radial circuit on a wooden workshop I have just had installed. I have run a 3 core 2.5mm swa from a consumer unit in a metal shed that has TT earthing in place. Does this cable need the armoured earthing as well as the CPC or just the...
  12. A

    Overhead 240V Supply - How is Earthing Provided?

    Hi, Posted here as I'm not an electrician, not because it relates to anything I'm considering "Doing Myself". My late parent's house is supplied by overhead 240V, and I was puzzling over how earthing is provided. As far as I can see following cables it goes .. Two overhead cables to the house...
  13. P

    Earth resistivity testing in wet ground

    Hi. The question is..... can saturated ground affect earth resistivity testing equipment? Some days there's an unacceptable earth reading, another day it'll be perfect. The only variable seems to be the weather - ie very wet. I've asked northern powergrid to convert to a PME system but they say...
  14. A

    What kind of earthing is this? TN-S?

  15. Dan_Brown

    Earthing Services - new to forum

    Great to be joining such a supportive and interactive forum. Should anyone have any questions about my company or the products we sell just give me a shout!
  16. Trevreg

    Correct earthing method for house?

    See attached photo of my new 3 phase supply at my house. Tails supply a Schneider 3ph board. Sparky is in two minds about the correct earthing method as the powergrid haven't supplied an earth. What's the correct method?
  17. littlespark

    Just curious (earthing)

    I’m not working on this… not yet anyway, but can someone tell me why there’s a fuse or a link on the earth here? The green wire is bonded to the metal mainswitch and the installation is metal conduit. I don’t know if the bare wire is an incoming earth off the cable, going out to a rod or...
  18. 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...
  19. 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...
  20. 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...

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