sub main

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  1. R

    Running a sub main to a Garage

    Hi, I have a job coming up to replace a CU. It has failed a few tests so has to be replaced. It is a large house and the board is a two tier one so will replace with similar. Whilst surveying the old board I noticed two 63 amp mcb's one supplying an extension to the house this has a ring and...
  2. P

    Fitting Sub Main in shop premises

    Hello, I have beens asked to do wiring in a new shop and there is a currently a consumer board supplying the building with all wires removed by another Electrician. I have been told that the owner of the building wants a sub main fitted with a meter to tell them what electricity is being...
    • peterl3986
    • Thread
    • building currently fitting main meter premises shop sub main
    • Replies: 11
    • Forum: Commercial Electrical Advice
  3. P

    Sub Main MCB supply cable

    Hi all, I have a sub main installation 30 metres from source on a supply that is generated from solar with a TT earthing arrangement. My question is would it be sufficient to protect the cable to the sub-main with a 40a MCB from the non RCD side of the plastic ( customer doesnt want an...
    • Pmarsh
    • Thread
    • cable main mcb sub main supply
    • Replies: 21
    • Forum: UK Electrical Forum
  4. T

    Sub main question

    Hello, ive recently been to a job where a new electricity supply is being installed. I need to run a 5 core 16mm swa 85 metres. will this be ok on a 100amp switch fuse with 80amp fuses? all the cable calculators ive used say yes and have been told on the phone, however im thinking its close and...
  5. L

    Fusing down a sub main to garage

    Afternoon all. Ive installed a sub main for a family friend in 10mm SWA (5 metres) from meter box to garage as they are converting to an office (x1 ring circuit and X1 lighting circuit) maximum demand in any case would be no more than 40amps. I am aware that the SWA does not need to be RCD...
  6. PhilCumbria

    Sub Main Supply and Earth

    I have installed a 16mm Twin and earth Sub Main Supply to CU, and realised the earth is only 6mm. Am I ok to run a 10mm alongside it to make it up to 16mm or can I run a 4mm in as 16mm only requires a 10mm Earth doesn't it?
  7. M

    Cable size sub main

    Hi all, looking for a bit of guidance/help please..... I have been asked to confirm the correct cable size on a sub main that supplies the communal area of a block of flats (4 flats in total). All that is supplied from the consumer unit under the stairs is a 2kw heater, led lights x 6, 2 x...
    • MATTMGM
    • Thread
    • cable cable size main size sub main
    • Replies: 10
    • Forum: UK Electrical Forum
  8. M

    sub main supply time delay trip 100ma 100A s keeps triping

    Hi Can anyone help ? i have a job where there is a tt supply and a swa sub main feeding a dist board with 13 final circuits , each final circuit is protected by a RCBO , all rcbos ok and not triping but the time delay trip seems very sesitive and keeps triping out , it tests ok no trip at half...
    • markbriffitt
    • Thread
    • 100ma delay keeps main sub main supply time time delay trip
    • Replies: 8
    • Forum: UK Electrical Forum
  9. J

    sub main

    Hi guys. Can't find anything in the regs and can't think of any reason why it wouldn't be acceptable but is there a reg that states a sub main cannot be supplied from another sub main inline of the origin? Thanks in advance
  10. M

    supplying sub main from a 3pole mcb?

    Gents, your opinion please. I am still finding my feet with commercial installation principles but this is ringing alarm bells ... My customer wants a small DB for 6 single phase AC units to be fed from the last spare 3pole MCB in a 12way DB - " a sub-sub main" for want of a better...
  11. C

    Reconnection of sub main

    Got a renovation to do on a ground floor flat which has been empty for a long time. The rest of the building has been renovated, pretty poorly on the electrical side! The current set up is a 16mm twin to the upper flat and a 16mm split con to the mid flat. The three phase cutout is currently in...
  12. R

    Sub main earthing arrangement

    Just after a little guidance on a sub main install as ive never installed one. my only "issue"' is how to install the earthing as in good wroking practice. rough plan being meter tails->sub main->3core swa->consumer unit. I plan to use the 3rd core as my earth (armour will be earthed too but im...
  13. H

    Sub main protection!

    Hi, been to job today to install a new bathroom light & fan in a HMO. The 1st & 2nd floors are fed via a second db on the first floor - db2. DB 2 is fed using 16mm twin, buried approx. 2m in wall, it is connected to the main tails next to db1 at the intake position, via Henley blocks, so...
  14. J

    Sub main to house

    Hi Guys, Question if I may for all the design-minded types here! I am converting a former chicken shed to a very small small, studio-type house. At the outset – four years ago – I had power brought into a garage on the site which is about 30m from the house. I fitted two meter boxes in...
  15. driverman

    ASHP via sub main

    Hope OK to post here New build project. Property having detached double garage with an all electric studio flat above. The garage will be wired via u/g SWA sub-main. The AHSP for the house will be sited by the detached garage. At this point in time I'm proposing to wire the ASHP from the...
  16. driverman

    Ahsp via sub main

    New build project still on the go. Property having detached double garage with an all electric studio flat above. The garage will be wired via u/g SWA sub-main. The AHSP for the house will be sited by the detached garage. At this point in time I'm proposing to wire the ASHP from the garage on...
  17. A

    T&E Sub Main

    Hi, I have a commercial property with several consumer units that are the old split type ie half rcd protected and half not, the boards need replacing but on some of the boards they have a breaker on the unprotected side feeding another consumer unit, ie a sub main in T&E , so when I replace...
  18. telectrix

    sub main started.

    new sub as existing 3phase board is full. this is the job that glenn's with me on. just got the first 3 single phase circuits in. waiting for location of 3 phase supply before getting cable in.
  19. K

    Volt drop at the other end of a SUB main.

    Hello people Just so i get this right i thought i would post my maths here for people to comment on. Garden lights on a sub main. Sub main is 20meters from the main CU on a 6mm armoured cable. the last light is 50 meters from the sub main. meaning end to end 70 odd meters. So my maths are...
    • Kyran
    • Thread
    • cable circuit main meters other people sub main volt drop volts
    • Replies: 8
    • Forum: UK Electrical Forum
  20. dksanders

    Armoured sub main?

    Hi All,I've just worked in a large, very old, house where the intake is in the garage, from the meter, tails go to a henley block then go through a 60A 30mA obsolete ELCB to a DP isolation switch that then feeds a twin & earth cable (looks like 16mm) which then runs 21m through the house to the...

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