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sub main

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  1. R

    Sub main

    Hi im doing an install first fix on an extremely large bungalow which has undergone a major reroof , the whole roof was taken down to accomodate a much larger loft space which in turn is going to be master bathroom with 3 bedrooms with ensuite in every room . What im planning on doing is running...
  2. L

    AC connections from PV system via sub main

    I have a potential customer who is asking if his proposed system can be connected to the grid via an external office, which has its own consumer unit fed off a sub main from the house consumer unit. Assuming cable csa's are ok for the load and volt drop does this meet the recommendations for...
  3. C

    Circuit Design question - Sub Main to kitchen DB

    Hello all. Im looking into designing an installation which involves supplying a small DB in a kitchen area. Im trying to see which is the best way of doing this. There will be a new singl phase main DB going in at the origin, which supplies a ring main, 2 13a heaters & 3 6a lighting circuits...
  4. B

    sub main to new build

    hi all, advice needed. I am quoting for a wire of a new house,much needed work. advice is about sub main to new dwelling,they want seperate meter to supply new dwelling,so in theory just one bill and calculate usage of new build. thinking of splitting existing tails and installing an isolator...
  5. R

    sub main in office.

    Hi. This may sound stupid, but when doing a sub main in the same building can you use one of the cores as an earth.(say 16mm 3core swa) or have to run a separate one? and the best way to terminate? ones before have be out houses had to put an earth rod in.
  6. C

    Kitchen sub main

    I'm on a rewire and am looking at running a sub main for the kitchen circuits because of the house layout it's easier do it this way. I'm running in 10mm t/e from a 50a RCBO to a main switch sub board. From this board I will have cooker 32a, A1 socket radial 32a, 6 amp lighting. Your thoughts...
  7. V

    Ze & Zs of sub main?? 2391

    No worries figured it, can mod please delete this thread. thanks
  8. C

    sub main cpc size?

    how do you work out the size of cpc supplying a sub main? and is it the same method for working out the main earthing conductor size? cheers in advance
  9. M

    sub main

    hi all need to run a sub main from main cut out to cu. what size swa would people use the run is about 4m max. would a 16mm be ok or would 25mm be best. thanks
  10. P

    Wiring of new sub main?

    Hi all i have a job at a shop coming up basicaly the called me in because some electrician had wire there new show cooker into a sub main board which was only fed from a 6.0mm cable on a 30a mcb which was running the above cooker and a load of lighting circuits. What i thought was obviousy run...
  11. K

    sub main from a tt supply

    Hi Guys, I am running a s.w.a. sub main to a garage c.u., the supply is TT, The s.w.a will be buried for a few meters and then clipped direct before entering the garage. The existing boured is 16th and has no free RcD ways, am i right in saying that a sub main should be protected if origin is TT...
  12. M

    Voltage drop to sub main.

    I need to feed a new board 50m away. Iv been doing clacs 16mm drops 7.2v over this distance. Is voltage drop to point of origin? Does this mean im going to end up using 25mm? Sorry if am being stupid,been there for hours and had info overload today :S Hes got 2 water supplys in his house(not...
  13. S

    sub main certificate

    I have installed 2 garage sub mains and not sure how the certificate and testing should be laid out. First Sub main in garage on 80a RCD with 16a circuit for sockets and second 6a for lights. The board is fed by 4mm swa from 32a on house board. House is TT and seperate rod at garage to make...
  14. E

    sub main

    Hi guys im doing a job that needs a sub main to a outbuilding was going to use 16swa but not sure what to do at origin with conecting in to a consumer unit size wise any ways round it or will it fitt ok
  15. S

    rules and info on running a pv system on a sub main board

    i have been asked to quote a pv system, the easiest board is a submain which is fed by a 16mm cable which is big enough for the pv system i want to install, but does the pv installation still work the same through a sub main, the main consumer board has no spare, and the sub main has lots of...
  16. G

    10mm Sub main to garage Cu

    Is it ok to run a 10mm t+e in distribution trunking from a double pole henley block to a new cu unit in a garage. cable will have to go though a brick wall very short run.
  17. S

    sub main 60m away from house, pv system to get installed on sub main roof

    we have been asked to quote for a 3.80kw pv system on a roof which is 60m away from the main distribution board, there is a sub main in the building where they want the pv system installed which has a few spare way on it, this submain is fed by a 16mm 3 core swa, do i need to take the pv...
  18. J

    CU change in apartment, sub main testing & cert questions...

    Hi, I'm replacing a cu in an apartment fed from a 60a sub main and have a few questions about the testing & certs. Ze - is that just the Ze supply side of the 60a switch fuse in this case? Zs - (Zdb?) at the board, I take it that's just Ze (as above) + (R1+R2) as usual, which I assume I can...
  19. D

    sub main

    Need to supply a sub main in a farm mechanical workshop need to work out cable size earthing isolation want to have about 40 amp supply about 5 meters run on catinary just wondered what would people do. Already have 8 way board with 30ma at end of circuit
  20. C

    3 phase sub main

    :confused:Hi All, This is probably easy-peasy for those of you that do it all the time, but I am struggling with the best or most acceptable way to carry out a 3 phase joint to run a sub main. I have in place an existing TP&N board and I need to run a sub main from this board to a new sub...

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