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  1. S

    2 phase consumer unit

    Three phase 4 wire supply from a three phase triple CB to that board and the Red phase going to another board
  2. S

    2 phase consumer unit

    The Switches are rated for 400V
  3. S

    2 phase consumer unit

    Hi, I am training to become and electrician, I have passed my C&G level 2 exams. I am working as an electrical improver. I came across a consumer unit today, which has two main switches and two phases L2 and L3 supplying it. Is this board to regs? Can you take 2 phases to a consumer unit?
  4. S

    Is a Radial circuit wired in parallel or series

    He said a ring final circuit is wired in parallel. It makes no sense to teach a ring final circuit is wired in parallel and a radial circuit is wired in series. The terms parallel and series have specific meanings in respect to electrical wiring. It would be confusing to say a radial circuit...
  5. S

    Is a Radial circuit wired in parallel or series

    He said a Radial circuit is wired in series. It is not, it is wired in parallel. I have left my notes at college, I was going to share all the other c**p  he taught us today but I don't have my notes to hand :(
  6. S

    Is a Radial circuit wired in parallel or series

    Our tutor told us this is how we should wire a radial circuit. With that extra earth wire???????????????????
  7. S

    Is a Radial circuit wired in parallel or series

    Thank you I can't believe our tutor told us there were wired in series, when i challenged him he said i was wrong. Unbelievable
  8. S

    Is a Radial circuit wired in parallel or series

    That could be the confusion. Not on my part though, on the tutors part. I challenged about 10 questions, I have them here with me. I think I was right on all 10 questions and they said I was wrong. I can't believe the tutor told the class a radial circuit is wired in series and then said i was...
  9. S

    Is a Radial circuit wired in parallel or series

    Hi, I am a trainee electrician. On my course today I was told a Radial circuit is wired as a serial circuit and a ring final circuit is wired as a parallel circuit. This makes no sense, surly they are both parallel circuits. Can somebody please give me a sanity check and tell me I am right...
  10. S

    RCD earth potential

    Not on TT, it was a TN-C-S system. 100 amps would trip an MCB but i don't think it would trip in 0.4 seconds. Would it not need 160A to trip in 0.4 seconds on a type B MCB. 32 x 5 = 160. The bimetallic strip would trigger the trip in a short time, not sure how long it would take the solenoid to...
  11. S

    RCD earth potential

    Thank you Doc, Thank you for taking the time to write this and for your advise. I will always check  Earth, bonding, polarity and Ze first in future on every installation I work on. Much appreciated :)
  12. S

    RCD earth potential

    One question, if a nail did bridge line and earth, would earth gain the same potential as the line?
  13. S

    RCD earth potential

    Yes I have a copy of guidance note 3, I have read it. I will re-read it again too. Maybe the electricians I am working with are not good at fault finding. They are good electricians though I am glad i joined this forum. Started me off on a good foot. I will follow the testing procedure by the...
  14. S

    RCD earth potential

    Sorry you are correct, impedance accounts for capacitance and inductance and is the correct word to use when talking about AC circuits
  15. S

    RCD earth potential

    I now see the importance of following the test sequence, and I now understand what people were trying to tell me all along. I feel very foolish. Thank you for explaining this to me in such an instructive manner
  16. S

    RCD earth potential

    Ok the external fault loop impedance. The earth conductor, the transformer and the incoming line conductor.
  17. S

    RCD earth potential

    Thinking about it if polarity is not correct you would not have a voltage when you touch the probe on the incoming line, so you could not do the test. This is not the recommended live polarity test though
  18. S

    RCD earth potential

    Ok I am sorry for saying he needs locking up then, I am new to testing, I tested for polarity using the method I outlined. I will see if my tester indicates polarity tomorrow, I had not noticed that before. I thought they were trolling me
  19. S

    RCD earth potential

    Put your multifunction tester onto volts, and hold the probes on the incoming terminals of the main switch on the consumer unit. Look to see if L and N are indicated as correct on the display  Thank you for the heads up :)
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