sub main

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  1. O

    domestic sub main question (fusing)

    Hi All, Been called to a customer property for nuisance tripping which i have resolved but when inspecting installation i have found an issue. The customer has a cabin at the back of the property with a CU inside, fed by 10mm SWA. it has 32a RM, another 32a (still locating its purpose), 16a...
  2. N

    Sub main

    Hi,, im doing a new build and the consumer unit is about 15-20mt from the meter cupboard. I’m going to use 25mm SWA 3 core, I have1 question I have to go up a long a short piece of stud work, do I need to put a box and blank on to identify the cable is there? Thanks
  3. W

    sub main breaker tripped by 20+ sub sub breakers

    I have been living in this house for five years. From time to time, the sub main breaker (bottom-right in pic1, the RCCB breaker that is tripped in the photo) for the ground floor would be tripped. This happens during the raining season (June to October). In the dry season, there is no problem...
  4. M

    UK Selectivity on concealed sub main supply

    EICR: I’ve come across 30mA RCD supplying a consumer unit via a 63A MCB and 16mm T&E. connected via an isolator to the cutout PME. (Ground floor, outside meter cab on wall) The T&E is concealed up the stairwell behind /within plaster into a 1st floor flat above a shop and into the CU so...
  5. ferg

    Sub main OCPD

    I have seen rather frequently SWA sub mains taken from Henleys protected only by DNO fuse and a stand alone RCD. I have seen it so often now that I am beginning to question my own knowledge. My understanding is that the sub main should have it's own OCPD depending on the cable it is...
  6. cliffed

    Sub main & bonding conductors

    Installing Swa 35MM 4 c,to new school block. This supply will come of a MPB,nearby,to me the supply to this MPB does not comply. Concern once again are the size of the bonding conductors realative to the the Main REC supply. The drawing we have,have no input on this, it’s a Tncs system,& earth...
  7. M

    Sub main earthing/CPC

    Hi all, Trying to get my head around an external install to a garden shed. I've run a 4mm H07 cable for the distribution circuit radial from the house. The 4mm is appropriate for VD over the distance. The cable is protected by RCD at the main consumer unit and a 20A MCB and travels up the...
  8. KeenPensioner

    No RCD in sub main

    Hi, as I've said I'm not an electrician but studying C&G in my own time and have worked as a mate. I've just had a qualified sparky upgrade my CU to a split board 10 way dual RCD. He has run a 4mm2 cable (from a 40A MCB protected by one of the RCDs) to my hut and will be coming back to wire up...
  9. B

    25mm split con sub main eicr code?

    Just done an EICR on a domestic, the sub main running from origin to cu is 25mm split con. Hard to know if its more than 50mm deep in walls etc without intrusive investigation. So could run with FI, but obv that doesn't deliver a satisfactory report. Bit of a tricky one as it would have complied...
  10. P

    sub main cable

    Im currently having an extension built and have arranged to have my meter and supply moved to exterior wall. I will have to install a new supply cable from meter to existing consumer unit , the distance is approx. 10mts I have the option of running the cable underground through the new concrete...
  11. A032701

    Sub main Off a Sub main????

    i have been asked to run power to a timberframe outbuilding (6mtr x 10mtr). there is a garage cu which is a submain of the main cu, which would be easier and more practical to run the power from. i havent actually been to the site yet, but assuming suitable CSA feed to the garage cu, can i then...
  12. P

    Sub Main Design Calculations

    Hi all, new to here. Just designing a sub main, very long time since I have done this so just wanted some thoughts. Its to a summerhouse sort of set up that will be at the bottom of a very long garden at a later date (sockets, lighting and hot tub planned from the board). Patio is getting done...
  13. G

    Loft conversion sub main & diversity

    Hi all, I am currently having a loft conversion completed and want to put in its own board in the loft. The main reason for this is if in the future, I want to let it out as a self contained unit, it will be much easier. The conversion will initially have a ring main 32 amp and a lighting...
  14. M

    3 phase swa sub main fuse

    Hello All Just a quick one does a three phase 25mm sub main in swa 4 meters long have to be fused even thou it comes from a bs1361 100amp services fuse then from a standard three phase isolation switch fitted from electricity company? Being swa and 25mm in size would this be acceptable? Reason...
    • mcm
    • Thread
    • 3 phase fuse fuses main main fuse phase sub main swa
    • Replies: 1
    • Forum: UK Electrical Forum
  15. M

    Sub main advice please

    First post!!! Very newly qualified so please bare that in mind!! Recently converted a garage alongside a builder friend. Garage/living annex now has been wired with RFC one lighting circuit. Havent installed yrt but electric underfloor heating and towel radiator (small shower room) Now what...
  16. S

    Rcd test on sub main

    Hey guys do i need to do a full schedule of tests after installing a supply to garage with additional board. Or do I only issue test results for the individual circuit i.e Garage. I realise I would need a 2nd schedule of tests for the 2nd DB. Also my 2nd DB has no RCD. So I presume I only...
  17. polo1

    Sub main protection, views please.

    Domestic, three phase supply, one phase to each of three consumer units. Two consumer units are local to the intake, the third CU is on the first floor. Currently the first floor CU is fed via a fused isolator at the intake. The replacement CU will be rcbos. However, we thought this submain was...
  18. T

    Extending sub main cables?

    Hi everyome We're refurbing our lower ground flat within a Victorian terraced house, and there are 2 flats above. Contractor has knocked out all relevant walls and found services running through what is to be open plan living room. So we need to relocate the service run to the flats above. Gas...
  19. C

    Block of flats EICR sub main only?

    Hello Guys I have been asked to carry out an EICR on a block of flat that share the free hold. TN-S system supplying x4 flats, i have never tested flats before so i am thinking i am only testing the sub main section as each of the flats are privately owned and the communal areas? Not carried...
  20. H

    Sub Main Issue on Condition Report!

    Hi, i have been to complete a condition report in a flat today and would appreciate a bit of advice. The db was fed via a 16mm twin and earth sub main approx. 12m run, protected by the 6o amp main fuse, tncs system. Gas bonded in 10mm at main cutout, water bonded in 10mm at db. Main earth at...

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