earthing

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  1. LmarshallSparks

    Electrical Safety Solutions for a Property Without CPCs

    Hello All, I have a slightly different question today, I have a customer who has multiple lights without CPCs terminated, the cables completely lack a CPC, however in some rooms they have a CPC and in other rooms they do not, so yes a CPC leaves the board, but does not run to all light...
  2. HappyHippyDad

    What is this earthing arrangement?

    As in the title? I can see the earth running up by the side of the supply cable from the ground (see picture), but with TNCS this earth would go directly to the CU, or perhaps be in a MET. This earth appears to go down, rather than towards all the other earths of the flats. In the picture...
  3. P

    Is guidance note 8 earthing and bonding worth buying?

    Helloo, Im looking to constantly improve my knowledge in this field and I feel like earthing/bonding is an area I want to touch on but im just wondering how much can guidance note 8 offer me. I know guidance note 3 was definitely helpful and the way it’s worded it’s much more easier to...
  4. T

    Solution for earthing SWA cable whose armour strands have been cut too short

    Hey everyone, got a bit of a dilemma here, I installed an isolator in a meter cupboard, unfortunately, I really did not measure things up and trimmed the SWA steel strands a bit too short, an EICR was conducted and this was flagged up. I don't think I can get a gland in anymore so wondering if...
  5. L

    Size of earthing lead for 10mm 3 core SWA

    I am installing 3 core SWA using a piranha nut. What size of earthing lead to connect the piranha nut to earth terminal do I need? Does it also need to be 10mm or I can get away with 6mm?
  6. S

    Hi I’m looking for the maximum permissible resistance reading of earthing rods

    Hi could anyone point me in the right direction for the maximum permissible resistance reading for earthing rods?
  7. 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...
  8. T

    Earthing, Metals and different voltages during faults

    forum erroneous post removed
    • The Tile Association
    • Thread
    • different during earthing faults voltages
    • Replies: 5
    • Forum: UK Electrical Forum
  9. H

    earthing switches

    Is it acceptable to put plastic screws in switches when there is no earthing to them to satisfy eicr?
  10. 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...
  11. 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...
  12. 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...
  13. S

    Earthing roof beams and roofing sheets on an attached garage.

    My friend has a conundrum regarding earthing the metal parts of his garage. It's an extension to his home which is on a TT supply, It's of concrete block construction with a metal roof, attached to timbers but touching 3 RSJ's which supports the whole roof. None of which is bonded. There are...
  14. 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...
  15. 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...
  16. 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...
  17. 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...
  18. 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...
  19. A

    Cable sizing earthing conductor

    Hi all, Hope you're keeping well I'm currently wiring a small commercial premises. 3 phas incoming supply, 16sq cables As it is in an urban area with a busy pedestrian street on both sides of the building I had to drive the earth rod just inside the door of the premises. However it is located...
  20. 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...
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