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sub main

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  1. 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...
  2. 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...
  3. T

    Can you install a sub main in a meter box

    Just a quick question as title says are you aloud to install a sub main for a house inside the outside meter box, they are meant to be waterproof ?? Thanks
  4. NDG Elecs

    Sub main cable type

    Hello Good Folks! * I am a humble domestic spark that is not the most experienced (although not a Electrical Trainee!). I tend to do board changes and smaller stuff. An existing customer has asked me to rewire a couple of flats, one of the flats already has a new sub main ran in by the builder. The cable...
  5. B

    sub main to outbuilding

    hi guys new to this so sorry if revisiting old stuff. I need to run a sub main 200M from the service head to a log cabin Super eco all LED etc, so 40A 9Kw max demand if i use the cable calculators i get 185mm cable we all know power networks cover huge distance with 35mm cable on 100A supply...
  6. S

    Garage Sub Main BS1361

    I am planning to run 6mm SWA from a main DB which is protected by a 40A fused switch. The SWA runs to a garage and is connected to a BS1361 40A, it then goes into an RCBO protected sub main board. Is the BS161 necessary at the sub main when there is 40A protection at the source? Any advice...
  7. S

    Feeding a sub main

    Hi all, I have been asked by a friend to quote for a new consumer unit and additional sockets in his home, all pretty bog standard. However, he is having the original brick built sheds to the outside of his house turned into an bathroom and passage way. He wants sockets and lights inside the...
  8. A

    Feeding a Sub Main

    Hi all, im a recently qualified electrician who is looking for a bit of advice. A friend of mine (also an electrician) has asked for my help on one of his jobs. The job is feeding a sub main distribution board which is located in the porch area. It is only feeding two circuits, one being a 32a...
  9. G

    RCD Protecting Twin & Earth Sub Main

    Hi first post here, did have a search around but couldn't find previous posts that answered exactly what im after. Had a look at a friends electrical wiring this eve and trying to advise them, as they are now unsure of the "future proofing" they have done would be compliant. (Im not a sparky...
  10. T

    extending a sub main

    hi guys, I have a job in a flat where a wall is being removed to make it open plan, the wall contains a 10mm T&E sub main that feeds the DB for the flat. In order to re-route the sub main, I will have to extend it very slightly (2m max), I'm unable to run a whole new sub main due to...
  11. M

    2 core SWA sub main in domestic flats

    Hi all, so what would be your plan of attack..... Gone to have a quick look at some remedial/maintenance on a domestic flat within listed building. Mixed occupancy of rented and owned. Owner not present but another person lets me in. Im told metering equipment and incomer is in basement but...
  12. J

    SEB sub main

    Hi guys, went to view a rewire today, a house split into 2 flats. At some point southern electric have put an extra supply in downstairs. So 2 meters from the upstairs meter they have run another cable upstairs to a second cut out fuse both 100a. The tails are then directly out of fuse into...
  13. T

    Testing 2 new circuits on a sub main - Confusion over test sheets

    Hello! I am going to be testing 2 new radial circuits later this week. I have just printed out some test sheets and have been reading through them and ive got a little confused! (It doesn't take much) The circuits are on a new single phase board, fed from a three phase db. It is on a farm...
  14. N

    Sub board from sub main

    Hi, I have quoted up a job and would like to know if anyone can see anything wrong with my design. From the 100A main cut out the tails go to an 80A switch fuse and out of there to consumer unit. I need to run a sub main to provide another consumer unit upstairs,whiere there is a possibility of...
  15. S

    Sub Main and seperate earth

    If I'm running two core 25mm SWA as the submain with a 16mm (non-armoured) earth seperately then will the earth require its own mechanical protection? Also as regards earthing the armour wire - will 6mm (from the tag to the earth block) be sufficient as it now counts as extraneous metalwork?
  16. S

    Sub main for garage 80 meters away

    Hi guys iv been asked to put a sub main in 80 meters away! It will need to have 1 x 32amp with 8sockets on 3 x 10amp with heater on each mcb 1 x 6amp with 8 lights on Please give me your thoughts on cable size thanks guys
  17. M

    TT system sub main design

    Hi all, a little stuck with a couple of things. house on a TT system with a 16mm main earth and a 100A main cut-out. the board has a 30mA 2 pole RCD main switch and all the circuits are 60898 protected. One of the circuits supply's the garage with a 6mm 70 degree SWA. The garage, however is...
  18. E

    Sub main protection???????

    Ok so western power have put in a new supply 100a cut out fuse and a 100A isolater for me to connect into. Im running a 10mtr 25mm 3 core swa into a loft space and down to a consumer unit. my question is do i need to protect the submain with a switch fuse or can it go straight into the 100a...
  19. R

    testing a sub main.

    Hi could someone help me please. I'm at college doing 2330 level 3. I'm currently doing inspection and testing. I need to know where I find my (r1+r2) on my sub main. Which is powering a double socket and a light. Thanks
  20. K

    Running of SWA, sub main

    Hi guys, I am just trying to price a job up, which I am a bit unsure of. It is at a commercial premises, the supply I have got is 300a three phase, with ruffley 150a - 200a per phase already being used. The customer has asked me to run a supply, 300m (buried) for a 50kw load. It will supply...

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