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  1. S

    long sub main supply

    Right I don't really do any domestic these days but my parents house requires a new sub main. My gran owns the house where the supply comes in and parents house is fed in 16mm over heads, on a TT system. One of the poles has rotten and snapped, currently propped up. My dad wants to trench it...
  2. M

    sub main

    Hi all Need to install a sub main to a holiday annex due to mains board in house at the minute. The annex and house are joined just two separate areas. As they asked for the cu to be in the annex I was going to run a 16mm 3 core swa to new cu and connect into 63a mcb at origin with 100ma...
  3. C

    Sub Main Supply

    Hello, My boss is away and I'm trying to score a few brownie points if i can. We are currently working for a plastic fabrication company who have just purchased a new building and we are starting the electrical instatation. My question is. We have a Crabtree powerstar pannel board to feed 4...
  4. S

    Main Earth to Sub Main

    Hi all, regards the csa of the earth to a sub main in a flat, does it need to me 6mm or 10mm or larger still? There is a flat with PME and they have asked for an EICR. However, the sub main is fed via 10mm t&e and the earth is only 6mm with a 10mm supplementary bonding and 10mm to gas reliant on...
  5. C

    Earth Bondiing For Sub Main

    New to the game and it all looks different in the real world! I am about to upgrade one of the installation CU's which is CU1, CU2 is already new, but I have a quick question, I have a PME system, supply split at a Henley block to serve CU1 direct and secondly to a switch fuse isolator which...
  6. A

    CU change and sub main upgrade

    Hi there - I’m changing the CU in my two bed terraced for my ELECSA assessment and just want to make sure that I’ve got everything right. Existing:PME, 60A service head, 16mm tails to meter and 16mm to 60A BS88 isolator/switchfuse, 8metre 16mm T&E sub-main to 30 yr old Wylex 60A. Main earth is...
  7. Top Cat

    Put in a sub main today

    Well actually i put it in then took it out again. I was 1 foot short of cable and the merchants were shut!:mad2:
  8. T

    Sub main help

    been asked to supply a site containter which is going to be used as an office. the run is 125 metres long. 2 fluorescents, a few sockets and a 3k heater in the office. sockets are going to be used for computer only. the swa is going to be run on the perimeter fence clipped direct. I'm thinking...
  9. U

    sub main cable calculation?

    morning all, im putting a sub main to another db in domestic property currently fed by single insulated 10mm tails. my question is the board will be supplied by a 63 amp breaker and is a 10m run so 10mm t&e was what I was going to use, but after a rough max demand calculation would state I...
  10. W

    Sub main off 160 amp service

    Hi I've been asked to install a distribution circuit from a 160amp service (3phase). At the moment there are 35mm tails terminating into single pole Henley blocks (100amp) via the utility meter, then from the Henley blocks several other distribution circuits are connected. The total load of...
  11. W

    Sub Main Isolator.

    Hi all. I need to provide Sub Main Isolation at main DB for secondary DB in extension. I want to fit 80A Fused Main Switch at main DB then take tails from main Cu at load side of meter and fit to Fused Main Switch in then fit new tails from main switch out back into meter. Finally fit sub...
  12. J

    Correct isolation for sub main circuits

    Now, go easy its been a long tough month and I may be over-engineering my thoughts on this: I was looking at an installation today which has the following arrangement: main 3 phase service head in 1 location (assume TNS) 25sqmm 4 core swa to a 3 phase DB which then has single phase 63A cbs for...
  13. M

    Sub main board question

    Hi All. I'm finally getting to start the installation that i'd asked advice on in October. However there have been some changes i've had to make i may or may not be on the right track. The plan was to put in an 8 way cu (sub main) with 6 RCBOs' to divide up a computer suite, 25 PCs', data...
  14. M

    16mm t+e sub main

    periodic report says it's inadequate. was installed 10 years ago. 60 amp rewireable fuse protects the cable. the main supplies a small bed sit with 1 x lighting circuit, 1 x 32 amp radial socket circuit and 1 x cooker circuit that has a 3kw cooker. a new wylex consumer united was fitted 2 years...
  15. prospark

    Split con cable for sub main?

    Hi folks, interested in opinions for the use of split concentric cable BS7870 for use as sub main to garage or loft conversion within a domestic property. Also were can i find a guide to current ratings as they dont appear in the regs tables or my basic cable calc many thanks steve
  16. D

    Splitting supply for two flats, sub main question!

    There are two flats in a converted terraced house and at present there is one CU for both flats. I am rewiring the upstairs flat and then disconnecting/blanking of the original wiring. I plan to leave the downstairs wiring as is but remark up etc. Upstairs I have calculated as 16mm T/E feed...
  17. J

    Sub main RCD protection

    Hi All, Think I know the answer but just looking for other options....I have been asked to install sub main 60 amp isolation switch supplying already installed 16mm T & E under floor to RCD protected consumer unit. Approx. 2 mtr of 16mm is in wall. I understand that regs require RCD protection...
  18. La Poste

    Sub main and diversity.

    Greetings. I am wiring a large garage for a friend. The wiring will be done in singles enclosed in 25mm round conduit running all the way around the garage in the roof space with T-Pieces put in place that will allow cables to drop from the roof space in 20mm conduit to the switches and...
  19. H

    problem with 3 phase rcd feeding sub main

    Just been to look at job tonight in a commercial kitchen where they are experiencing nuisance rcd tripping. Bare with me while i explain the scenario! A separate/outside food store and prep room has approx 5 large fridges/freezers, lights, insectocutor, and a small computer printer for orders...
  20. B

    SWA Sub main in concrete floor?

    Is there any special requirements for running a 16mm swa sub main in a concrete floor?What i mean is on the floor prior to laying the concrete Any info would be appreciated

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