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  1. R

    Struggled with this one

    Is the fact that basic protection is not covered, but they clearly state fault 411.1 reg
  2. R

    Struggled with this one

    I answered with 3 but the answer was 4 must be an error
  3. R

    Struggled with this one

    Where the measure of automatic disconnection is employed, fault protection may be provided by 1. Protective earthing only 2. Protective equipotential bonding only 3. Protective earthing and protective equipotential bonding 4. Electrical separation
  4. R

    Any quick calcs to get a rough min Zs allowable

    I'm also guessing the new regs will lower the allowable max Ze to increase cable sales
  5. R

    Any quick calcs to get a rough min Zs allowable

    I'm also guessing the new regs will lower the allowable max Ze to increase cable sales
  6. R

    Any quick calcs to get a rough min Zs allowable

    I knew I'd seen something like this and I remember rule x10 for C and D types, anything for BS88
  7. R

    Any quick calcs to get a rough min Zs allowable

    It's a good check though
  8. R

    Any quick calcs to get a rough min Zs allowable

    yes sorry of course
  9. R

    Any quick calcs to get a rough min Zs allowable

    Any quick calcs to get a rough estimate min Zs allowable for protective devices MCB, BS-88 etc, Im thinking in an exam saves time even looking at the tables if there's a fast ball park check rule of thumb.
  10. R

    Selv fault protection

    Regulation 415.1.1 doesn't make clear if it's for both or just SELV
  11. R

    Selv fault protection

    Surely if one side goes down to earth you can pick up a residual imbalance on the primary giving fault protection 415.1.1 or is this just for PELV
  12. R

    Selv fault protection

    If a selv circuit had a fault to earth, how is the fault monitored and flagged up
  13. R

    This one beat me and I'm not sure why I'm wrong

    Nope overload current is present in a sound circuit, definitions
  14. R

    This one beat me and I'm not sure why I'm wrong

    Although it does state it's an RCD capable of the added functions, I think the question writer doesn't understand its function
  15. R

    This one beat me and I'm not sure why I'm wrong

    It's from sparky facts exam sim, this is what annoys me about the questions about the 17th, the the definition can detract from the capability of the device
  16. R

    This one beat me and I'm not sure why I'm wrong

    I know it's 4. from definitions but why doesn't 2. Apply
  17. R

    This one beat me and I'm not sure why I'm wrong

    RCBO offers protection against 1. Basic contact 2. Short circuit current and earth fault current 3. Short circuit current 4. Short circuit and overload current
  18. R

    Another exam question

    What's the easiest way to get PFC Enquiry Measurement Calcs
  19. R

    Difficult overload omissions question

    To be honest when you get to this level of design, it's normally done by an electrical engineer not a sparky
  20. R

    Difficult overload omissions question

    That was my logic

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