submain

  1. bigspark17

    Submain swa size check

    Just after a bit of advice from thoose of you that deal with this regularly & want to make sure i get it right. Swa submain to phone network mast 63Amp single phase supply Pme supply assumed ze of 0.35 245M run Ive been trying to calculate which size swa & cpc or 3c swa to go for, would like...
  2. T

    Shed submain SWA RCD protection

    Hi all, Went to a house on friday due to sub-main to shed not energising. This was simply due to the MCB playing up. I flicked it on and off a few times and it works fine now. However im not happy with the way the submain has been installed poorly. The sub-main is in the form of a 3 core SWA...
  3. grumpyjohn01

    Repurpose submain

    Hi All, Have been asked to provide some outside socket outlets in a retail setting for market traders / catering vans. The premises is an old industrial site comprising various historic buildings etc. There is an existing 3 phase supply to the location that used to feed a building that has been...
  4. G

    no rcd circuit on 5x5 splitload board

    HI all curently have a 6x6 split board, submain on circuit 1 to another split board, is there a way i can get this off the rcd or make it a high integraty board, need the submain off the rcd, 50mm everywhere so no isssues photo below DSC 0054 - https://ibb.co/mh6vgF cheers Grand
  5. F

    Submain Earth/Bonding question?

    Hi guys/girls Just some clarification needed. I have an house where there is sub board in the garage , and also a boiler in the garage. The water copper pipe that connects to the boiler is continuous from the house. I am aware of the exporting PME situation so plan to drop out the 3rd core of...
    • Flakey
    • Thread
    • connected garage house question submain water
    • Replies: 24
    • Forum: UK Electrical Forum
  6. W

    150m submain to multiple outbuildings earthing (PME)

    Hi there can I describe an installation and I would love to hear some opinions as to weather the earthing is up to standard. Its quite a long run so I'm concerned about the difference between true earth and system earth! Submain comes direct from meter cupboard in farmhouse through 100a main...
  7. M

    Dishwasher repair garage submain

    just had a customer in the phone saying that an engineer refused to work on her broken dishwasher because of a failed earth loop test and no rcd being present The setup is as follows Tt supply From the House consumer unit a 10mm twin and earth runs through the house buried in the wall...
  8. bigspark17

    Concentric cable used as submain?

    Situation DNO supply into garage outside meter box, submain into house approx 10M in concentric cable. Fused down by 80 swfcu . I dont know the size but it has 7 neutral strands and approx same cpc strands. Any thoughts on this.? Is it ok? I would have thought ok as same if not very similar to...
  9. T

    Main earth for a submain

    Hi everyone, apologies in advance, it's been a long day and I've not even had my lunch yet, so I'll try and keep this quick! Running a supply to a wooden summer house, coming from existing CU on a 20A MCB with 30mA RCD as the main switch. It's going to run in 4mm 3-core SWA buried under a...
  10. bigspark17

    Submain 16mm t&e cpc chopped

    EICR.. 80 switch fuse in meter cupbord, 16mm t&e to cu with 6mm cpc chopped both ends and 16mm earth ran along side submain. zdb/pefc/pscc fine. bonding from db fine. i would never do this but struggling to find a reg number aggainst it :/ opinions appreachiated
  11. G

    Earthing inside a submain panel from main swa incomer

    OK, going to keep this short. Supply is 150mm 4 core SWA, with NO supplymentary earth ( calcs done by others, ) QUESTION IS. Do you NEED to run an earth ( is it a regulation) from banjo on inside to earthing terminal inside board. Common sense and a simple ohms continuity test (0.01 ohms)...
  12. E

    TT supply shed submain

    New TT supply on unbuilt barn conversion with 8ft of 5/8 rod & reading of 48ohm with current swamp conditions. next phase is large all wood storage shed with power & lighting fed in 10.0mm 3core ,swa plan is drive another rod & link both or is it possible to export TT earth?
  13. J

    Running a submain through distribution board, right or wrong

    Hi I've been pulled today for installing an swa glancing into the top of a header trunking then taking it through the db, saying its against the regs saying a once a main sw is off the whole db has to be dead, I can't find a reference to it, normally I would always gland it in the bottom of the...
  14. frontier219

    Split Concentric as a submain

    Hi All, Having a little discussion with my old man over a job. The job is a domestic property, the CU is around 7 metres in cable length from the meter. There is a switch fuse around 4m from the meter, in a cellar. However, the tails are run very shoddily in an old bit of water pipe and then...
  15. V

    30mA rcd trips at 17mA when submain connected mcb is on...ok when submain mcb is off

    Hi all Ok...been to a job today with a random tripping 30mA rcd its a bit of a full on install...at a undertakers.... 3p cutout feeds 3 main switches...1 for a workshop db...for a flat over the undertakers...1 for the undertakers.... from the undertakers mainswitch...we have a swa submain to a...
  16. J

    submain to new build flat

    installing a sub main to 5 x new flats but the service heads and meters will be about 50meters away Ive worked out the design current to 74 amps due to it being electric heating and immersion ect (no gas) The cable are to be brought in same duct and around 30c temp. I worked out that 25mm...
    • Jimmyb
    • Thread
    • build flat new new build submain
    • Replies: 22
    • Forum: UK Electrical Forum
  17. T

    30ma for existing 16mm T+E submain ??

    Hello all! I am working in a property with 3 old rewirable fuseboards, each fed from mcb's in a modern consumer unit at the incoming supply. We want to change the 3 fuseboards to 17th ed RCD etc. However, as the 16mm T+E is less than 50mm in the wall I wonder whether I should protect each...
  18. B

    Additinal protection to TT submain

    Feeding two outbuildings by overhead cable from TNCSsupply. Building one, steel framed barn,earth floor etc. Building two, stableblock, concrete floor/block walls and steel roof frames. Approx 20 and 30m respectively from supply. For all obvious reasons going to TT each building and...
  19. P

    Outbuilding Submain

    An outbuilding is fed from a separate single way board in the house and has a 2c 4mm SWA to the building of 7m. Its a TNS. This outbuilding has its own water main (albeit in plastic) which comes directly from the water meter not through the house. Testing between copper pipes below the sink and...
  20. loplug

    Submain

    Is it ok to run a swa submain in a trench with the dno supply cable or do they need to be separated?
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