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submain

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  1. M

    Help with submain design

    Hi, just a quick one, doing a college design project and I am currently on with sizing 3 phase submains to the DB's. I am fine with the cable sizing, although something seems to stick in my head about allowing for 'future expansion of circuits'. At the moment I have sized the submain at 16mm 4...
  2. C

    Submain from next door, no earth!

    I went to replace the CU at my parents house last week (Wylex re-wireable). The live and neutral look to be about 16mm twin (not t&e) and come through the wall from next door. As they weren't home I have no idea what the earthing arrangement is there. My parents house is still earthed via the...
  3. R

    Do you have to protect submain if wired in SWA?

    Hi Guys, Sorry title should have been 'do you have to protect a submain with an rcd if wired in SWA?' Please excuse me if this has already been asked but i cant find a straight answer to question... I need to change a fuseboard for a split load board (2x 30ma 63amp RCD's). off this board there...
  4. J

    Submain voltdrop

    Hello, im after a bit of advice reguarding the cable to supply a db in a farm shed, the design current is 32a and the run is 61 meters. the vd with 25mm is 3.42 which is going to be ok but i would of liked a little less due lights need to be on 4mm but only by 1v, anyway i rang for a price for...
  5. C

    Submain ?

    Hi all. I'm new here and after some help please... I'm currently wiring an old house as complete renovation progresses. The house is to be divided into two some time in the distant future, so two separate consumer units are being fitted. But, for now, there is to be just one (existing) 100amp...
  6. dansk

    Submain help please

    Hi, Ive not had to run submain often so i just wanted some advise. Survey today - 4Kwp on outbuilding roof. The outbuilding already has a supply from the house in 2.5 SWA, i advised a fresh supply (TBC once i calculated VD) but i suspect 8mm SWA. The main CU in the house has a spare way but...
  7. M

    parallel swa submain

    Hi I am considering the possibility of using 2 unused and existing 95mm 4core aluminium cables in parallel to feed a new submain distribution board I wondered if any one else has done similar and may be able to reassure me on the practical and/or technical implications the length of run is 130m...
  8. G

    submain to garage and cabin

    hi have been asked to price to replace garage swa and new submain to log cabin and outside caravan hook up. garage is 20 mtrs and cabin 90 mtrs from that was thinking off fitting new 80a switch fuse were submain for garage is now.replacing the 63a rcd that is there and then run feed to cabin...
  9. I

    TT submain

    hi guys Need a little help, not done much work on TT supply systems. Have a job lined up to supply an outbuilding from the main house TT supply. Customer wants a seperate sub main to supply the outbuilding. plan on running the submain as per usual ( split tails via henly then into switch...
  10. E

    submain 10 mtrs away from main supply run in tails

    Exactly what the title says. The tails have been run under the floor and chased inside a wall with no protection. What should i do? Its a kitchen rewire and its nearly finished. Theres no switch fuse to isolate sub main only main cut out fuse :confused:
  11. S

    rules and info on running a pv system on a sub main board

    i have been asked to quote a pv system, the easiest board is a submain which is fed by a 16mm cable which is big enough for the pv system i want to install, but does the pv installation still work the same through a sub main, the main consumer board has no spare, and the sub main has lots of...
  12. P

    Out Building Has No Earth

    Hi guys, working on a pir yesterday, 2 buildings, readings in main building fine. 10m away there is an out building getting feed from an isolator "in main building" earth reading 50ohms. Can i supply a new earth via a earth rod for the out building and put a rcd on the main switch at the...
  13. F

    Ipfc/Ipsc measurement at 2nd distribution board

    Hi, My first post - hope someone can help. I need to test the prospective fault current at a garage consumer unit. The unit is supplied from an RCBO in the main consumer unit. I intend to carry out the test at the incoming terminals of the garage consumer unit switch with everything switched...
  14. kevyn

    Overhead submain connection

    Hi all, I have been asked to wire a small 2 bay cow shed in time for the dark nights coming in. Supply comes from a 2 wire overhead which is supplying the adjacent shed in a 2.5mm 6242Y (overhaed on bracket on my cow shed). No chance of connecting to the other shed as it is too far away. In my...
  15. R

    RCD Question!

    Hi new to the forum so Hi again. Quick background of myself, I am a time served electrican but still new only 22 I have the 17th and 2391 however my background is industrial hence havent done much with houses in the past anyway.... Im looking to put a 2 way garage RCD consumer unit into my...
  16. T

    Filling in Cert for SubMain help?

    Just a few questions on a test scenario, quite hard to explain in writing but hopefully you'll understand. If a detached building is fed from an older type fuse with SWA, then the detached building is TT'd, (Earth Rod) what details am i recording on the cert for.... Supply...
  17. M

    Submain calc

    Right, I'll try to keep this simple. I have a job coming up that involves installing a couple of storage heaters. The 2 rooms are on the 2nd floor of an old building and the DB is in the basement. They also require a ring main to give power to the 2 rooms. There is no way of running cables...
  18. L

    very low pfc on submain board

    hi all hoprfully someone here can answer this question for me: i tested a sub mains today and i only got 0.35 KA is this normal for a submains as at the main mainsboard the pfc is 3.3 KA the main fuseboard has a rcd main switch so at the submain i had to use no trip pfc not sure is this makes...
  19. G

    Best practice for submain circuit protection

    I am currently changing an old consumer unit for a new RCD protected split board. One of the circuits is a 6mm submain circuit protected by a 32A MCB that exits the house, crosses the court yard via a catenary wire, and enters the garage 4 way RCD protected board. Is it ok to put this circuit...
  20. A

    Testing for ze on a submain cable?

    hello chaps i'm going to be doing some final live tests in a block of flats were doing at the mo on monday and was trying to remember what earth cable to test on for Ze in the flats consumer unit. The flats are fed by a 16mm t+e submain with an additional 16mm earth run along with it. now do i...

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