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  1. G

    18th edition wiring regulations update exam in Worcestershire wanted

    Does anyone know where I can book the 18th edition wiring regulations update exam. I live in Worcestershire, I want to just sit the exam, I do not need a course as I only passed the 17th edition last year.
  2. G

    Regulation 434.5.2 - Time a conductor can withstand fault current

    So you are saying S is the PSSC Not the current at which the breaker / fuse will break the current.
  3. G

    Length of tails between meter and consumer unit

    I was discussing regulation 434.2. I was asking if a device providing protection against fault current was needed (i.e. a fuse) if the tails were longer than 3 meters. You are discussing a different regulation, concerning isolation.
  4. G

    Length of tails between meter and consumer unit

    But am I correct in saying this omission is relating to regulation 434.2 434.2 - A device providing protection against fault current shall be installed at the point where a reduction in CSA applies. So regulation 434.3 is saying the omission of devices for protection against fault current need...
  5. G

    Regulation 434.5.2 - Time a conductor can withstand fault current

    Can anyone help me clarify the formula in regulation 434.5.2, the time a conductor can withstand a fault current without sustaining damage. t=k2 x S2 / I2 The regulation states I is the effective fault current. Does effective fault current mean the prospective short circuit current/...
  6. G

    Length of tails between meter and consumer unit

    Just to verify we are on the same page. My interpretation of regulation 434.2 is that a device providing protection against fault current shall be installed at the point where a reduction in the CSA applies. Then regulation 434.2.1 goes on to state that a device for fault current may be...
  7. G

    Length of tails between meter and consumer unit

    What you are saying is a DNO policy. Does regulation 434.2.1 (i) sate this? The way I read regulation 434.2.1(i) It is saying you may put a fuse in the tails within 3 metres from the meter if you reduce the cable size?
  8. G

    Length of tails between meter and consumer unit

    so are you saying that in a situation where the consumer unit is more than 3 metres from the meter, you need another 100 amp fuse, immediately after the DNO's fuse? I don't see the point, what would that achieve?
  9. G

    Length of tails between meter and consumer unit

    Hi, I am currently studying for my 18th edition regs update exam and came across a video by SparkyNinja on you tube. I think SparkyNinja is very good and produces high quality content. However I disagree with his interpretation of regulation 434.2.1 (i) In his video he says you need a fused...
  10. G

    Multi-core neutrals and earth

  11. 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...
  12. 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.
  13. Borrowed.jpg

    Borrowed.jpg

    • Gigsy
    • Media item
    • Comments: 0
    • Category: Professional Electrician
  14. G

    Multi-core neutrals and earth

    Good point, thank you. Glad I checked with the forum. Do you know what reg, forbids shared neutrals?
  15. 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.
  16. 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 :)
  17. G

    Multi-core neutrals and earth

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

    Multi-core neutrals and earth

  19. borrowed neutral.png

    borrowed neutral.png

    • Gigsy
    • Media item
    • Comments: 0
    • Category: Professional Electrician
  20. 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.

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