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  1. G

    Multi-core neutrals and earth

  2. G

    Multi-core neutrals and earth

    I found the regulation in BS7671 314.4, yellow book When an installation comprises more than one final circuit, each final circuit shall be connected to a separate way in the distribution board. The wiring of each final circuit shall be electrically separate from that of every other circuit...
  3. G

    Multi-core neutrals and earth

    I just drew this. Not sure if it makes sense or even it is correct. Any feedback would be welcome.
  4. G

    Multi-core neutrals and earth

    Good point, thank you. Glad I checked with the forum. Do you know what reg, forbids shared neutrals?
  5. G

    Multi-core neutrals and earth

    It is over complicated, I would design it different, but the person who's house it is wants all the breakers in one location.
  6. G

    Multi-core neutrals and earth

    Actually thinking about it, You are right. Exactly this situation could occur, you could leave a circuit powered then disconnect the neutral at the termination at the end of the SWA and the neutral from another circuit could become live. Sorry you are right. It could be dangerous. Thank you :)
  7. G

    Multi-core neutrals and earth

    That situation could never occur with the design I have drawn
  8. G

    Multi-core neutrals and earth

  9. G

    Multi-core neutrals and earth

    I know of configurations in which sharing a neutral can result in a dangerous voltage on the neutral. I knew this thread would go down this path. I could draw the situation, can you? If so draw it then explain how the fault relates to this design.
  10. G

    Multi-core neutrals and earth

    Apart from the shared neutral being dangerous, which I do not think it is in this configuration, is there any reason why we could not wire it as shown?
  11. G

    Multi-core neutrals and earth

    It is more of a parallel conductor design than being a shared neutral in my opinion. The person I am working for is electrically qualified and this is how he said we wire it. I am unsure that is the reason I am asking here. In this configuration it is impossible to get a dangerous voltage on...
  12. G

    Multi-core neutrals and earth

    3 Phase is unavailable
  13. G

    Multi-core neutrals and earth

    Hi, I am currently training to become an electrician. I have passed all relevant C&G level 2 exams along with C&G level 3 inspection and testing and principles of electrical science. I have been asked to help design some garden circuits but been given specific instruction on how the circuits...
  14. G

    Mirror light from lighting circuit. FCU or isolation switch needed?

    That is a great idea, thank you :)
  15. G

    Mirror light from lighting circuit. FCU or isolation switch needed?

    Thank you. That is exactly what I think.
  16. G

    Mirror light from lighting circuit. FCU or isolation switch needed?

    1.5 not i.5
  17. G

    Mirror light from lighting circuit. FCU or isolation switch needed?

    Hi everyone, Does a mirror light on a lighting circuit need to be on an isolation switch, fused spur or can it be wired directly on the lighting circuit? My thoughts are; My job is to protect my cable, there I have no issue, i.5 mm2 cable to mirror light Local isolation, the mirror does not...
  18. G

    Rear entry three phase board

    Thank you :) I will not use rear entry again. From now on 4 inch metal trunking top and bottom into glands and make off the SWA into the board. And I would insist on the customer purchasing the meter designed to go in the board.
  19. G

    Rear entry three phase board

    My question would be, say if you're PFC and PSSC are less then 18,000 Amps, why would you use a MCCB over an MCB on a main DB supplying a sub DB?
  20. G

    Rear entry three phase board

    The interrupting rating for an MCB is 18,000 amps, and up to 200,000 amps for an MCCB.
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