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sub main

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  1. J

    SWA sub main

    I've been asked to carry out PIR on an idustrial unit on an old farm. The unit is supplied by a sub main and privatly metered. The sub main is a 35mm 4 core swa 3 phase and neutral on a 60947-2 100A MCCB i can see that the armouring on the cable is big enough to be the cpc but is this ok on a...
  2. telectrix

    sub main feed

    job came in today. granny flat already has 32A ring and 6A lighting. cust. has had a shower room built on. will have a 9.5kW shower and 5 downlighters. no problems there, and room on house CU to fit MCB and RCD. problem is, the sub main is fed with 6mm SWA. obviously inadequate. cust is OK with...
  3. S

    sub main

    I am currently in the middle of rewiring a house and will have to run in a sub main for the consumer unit. The consumer unit has to be moved approx 10m from its current location where the electricity metre is. Am I right in asking the electricity supplier to install an isolator between the meter...
  4. Griffin

    Sub main

    Hi All, Just a quickie, On a job at the mo. A replacement c/u , rewire shower and some sockets etc. The c/u is near the kitchen fed by a 16mm t+e sub main. The sub is fed from a switch fuse in the hall way. Prior to the switch fuse is a older 100ma RCD. you know the big grey and black...
  5. sythai

    Sub main RCD or not?

    Recently had to install additional fuse board for extension. Spilt tails at source, henley blocks and installed 100A switched fuse to supply new board which is located other side of house. 25mm tails are 10m long, done calc all ok, and checked with local DNO all ok. Got the tails up the...
  6. M

    sub main help

    im going to rewire a large house. i have decided to put 1 cu in the basement next to the service head and one on landing to serve top floors. i just need to know a few bits. i know i must do ZE at the intake position, but im gona split the tails into a henley block and have a supply to both cu...
  7. B

    msall sub main

    can any body see a problem with the following a shed supply has been run 20m in 6.00mm t+e with 2.5mm earth conductor protected by a 32A breaker looking in the reg it stats that the main protective conductor should be half size of neutral conductor which for the sub main would require a 3mm...
  8. D

    Sub Main and Fusing

    Hi guys and please dont shoot me down. I qualified this time last year, but due to family commitments, I have not been active for nearly a year, so a little rusty. Just started a rewire on a new extension on an old victorian house. Easiest option was to run new 16mm tails and 16mm earth, 5m...
  9. P

    What is a sub main?

    Hi, fellas, I am in my first year at college doing 2330; just recently learning earthing & bonding. Having never worked or been involved in the industry, or not knowing anything apart from what I have learned at college, i am unfamiliar with some of the terminology. So when the lecturer started...
  10. B

    switch fuse sub main

    Hi,ive got a new garage connection to do,im going to put a switch fuse in after the meter and a henley block ,question is, does anyone know any small switch fuse units i can attach an SWA cable to.Thanks
  11. J

    Sub main question

    Hi all, been to look at a job on a farm on Friday they want a extra socket for welder, any way just wanted your opinions on this submain, the supply is fed by a c50mcb on 16mm 2c for 15m to dis board, from there it is feeds 3 sheds all about 40meters away. the thing im not to sure on is there is...
  12. M

    Kitchen Sub Main

    Using the exsisting 6mm cable as a sub main supply to kitchen which currently has 3 double sockets (which were connected to to the upstairs ring bizzzarly) Clipped Direct 6m Run Putting in a crabtree 63a cu with a 32a rcd ring for the high level sockets and a 20a radial for the cooker...
  13. T

    earth connecion for sub main

    hi Customer has had meter installed outside house in external box10 meters from consumer unit, cu is in kitchen at back of house. Soooo need to install a consumer unit 10m from the servicehead/meter. Plan to run tails from meter into house and connect to 100a isolator, then use 25mm swa from...
  14. K

    Volt drop on three phase sub main

    Can anyone tell me is the allowable volt drop for a three phase supply to a sub main 3%????? Cable length 120m 100A supply Correction factor .81 per ampere per meter 100Ax120mx.81 1000 = 9.72v 400x3%=12v so this is good ya? Keith
  15. E

    sub main

    incoming house 100amp domestic supply TNCS/PME looking to run a 63amp sub main in 25mm SWA 10m out to an outside block shed to feed a ice energy heat pump system and a couple of sockets on a radial and a couple of lights. shed has its own water supply. the spec fo the heat pump demands a 300ma...
  16. S

    sub main?

    ok so altered sub main feeding annex to commence building work for an extension. the sub main is 10mm T&E with my altered bit swa outside cleated temporarly. so gota do sub main permantely and i think best way is to run sub main again from house fuseboard. so main earth has to be 16mm, or do i...
  17. R

    sub main earth

    Ill be installing a sub main on a new build next week using 16mm twin and earth with also takin a 10mm earth from the main board. Is it possible tht i can take a 10mm from the sub main for main bonding the water. Thanks in advance.
  18. J

    Installing a Sub main

    Hi, Can anyone offer me some advice? I am installing a sub main to a barn/workshop. There will also be a classroom attached to this and a supply to a shower block. The following circuits are required... 2 lighting circuits (one for indoor and one for outdoor) 1 Ring circuit A supply to...
  19. M

    Distribution circuit to Sub Main

    Hi, I need to know what info I should enter on the periodic inspection report in regard to the distribution circuit. The form requests the size of the phase conductor and the cpc". The distribution circuit is a 4 core SWA and the armoring is used as the cpc. What should you enter as the CSA"...

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