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  1. R

    Automatic disconnection of supply

    I know it's not true but based on that reg alone it states : Basic Protection Persons and livestock shall be protected against dangers that may arise from contact with live parts of the installation. This protection can be achieved by one of the following methods: Preventing a current...
  2. R

    Automatic disconnection of supply

    Can the above method alone be classed as basic protection according to 131.2.1 it can. Based on that regulation you can leave live terminals exposed if supplied by a 30mA RCD
  3. R

    When can an RCD be omitted from a domestic cable run

    If not protected by earthed metal sheath trunking or conduit at less than 50mm RCD required then
  4. R

    When can an RCD be omitted from a domestic cable run

    What requirements need to be met to not require an RCD for a cable run in safe zones
  5. R

    Finding the correct cable table

    Typical sarcastic electricians nothing changes
  6. R

    Finding the correct cable table

    On and off
  7. R

    Finding the correct cable table

    A lot of these mock exam questions are not specific about armoured or non armoured multicore cables, flat twin or not etc, the correct table to use can be a bit of trial and error until you get the correct answer for Volt drop for example.
  8. R

    551.4.4.2 Generating sets

    Why does this regulation refer you to regulation 415.1 rather than just stating 30mA RCD, this is one bit about the regs that confuses me, sometimes it's direct and consise, and other times it refers to another reg. why?
  9. R

    And another mad question ("minimum current")

    Ohhh I see so by minimum they are talking what's the minimum that will do the job, the wording is bad it should say calculate the minimum required capacity live conductor current for the circuit.
  10. R

    And another mad question ("minimum current")

    Good stuff find device rating divide by factors, look up increased calculated current against correct table and check install method column choose nearest highest value. Then worry about volt drop
  11. R

    And another mad question ("minimum current")

    in that case its volt drop which you would check by length having selected cable
  12. R

    And another mad question ("minimum current")

    why minimum and not maximum
  13. R

    And another mad question ("minimum current")

    28. Which one of the following is not considered when calculating the minimum current carrying capacity of live conductors of a cable? a Ambient temperature. b Grouping. c Type of protective device. d The maximum permitted volt drop.
  14. R

    Struggled with this one

    I concur
  15. R

    Struggled with this one

    Is as though they're trying to be clever would be better to ask what other methods could be included, but the way I read it is you have an RCD at the board and they are now asking how do you create fault protection for your circuit, which you have no idea about location of or what it's for
  16. R

    Struggled with this one

    Totally understand that, just seems a very weird question
  17. R

    Struggled with this one

    all told it's another bloody awful question, plus the answer refers to 411.1 as the source.
  18. R

    Struggled with this one

    Then you would be in breach of 411.1 in answer to previous post above
  19. R

    Coordination between conductor and oveload devices

    A good memory trick for exam conditions for coordination Ib In Iz (Alphabet) the earlier letters are always lower in value than the earlier ones, saves remembering Ib < In In < Iz Ib < Iz
  20. R

    Struggled with this one

    You are getting mixed up with placing out of reach, separation means via a transformer (electrical separation)

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