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  1. rich3009
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    rich3009 EF Member

    Location:
    Lincolnshire
    When doing mock exams 17th edition the questions that always have me stumped are about general characteristics, I had a question with maximum demand and max current in choices, both seemed feasible answers
     
  2. dmxtothemax
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    dmxtothemax Regular EF Member

    Location:
    Australia
    Business Name:
    David Haddock Electronic Repairs
    you need to read the question carefully !
    What exactly are they asking
    not your interpretation
    what are "they" asking - "exactly"
    makes all the difference !
     
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  3. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    Maximum demand is generally the figure you obtain after diversity is applied to the maximum current. For example if you have three 32A ring final circuits their maximum current demand could theoretically be 96A but in reality this is not likely to happen so you apply diversity to come up with a maximum demand figure.
     
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  4. rich3009
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    rich3009 EF Member

    Location:
    Lincolnshire
    Right so what they are looking for is a design figure not an absolute, but in characteristic of design max current would be a consideration to arrive at max demand
     
  5. rich3009
    Offline

    rich3009 EF Member

    Location:
    Lincolnshire
    Heres another strange one
    7 o/c 4 - Which of the following items does not offer ‘basic’ protection:
    a a circuit protective conductor.
    b a socket outlet.
    c a lampholder.
    d equipotential bonding conductors
     
  6. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    Have you looked up the meaning of basic protection.
     
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  7. rich3009
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    rich3009 EF Member

    Location:
    Lincolnshire
    Yes a few of those are nothing to do with basic protection, the lampholder is the obvious one, but other answers would be correct a. And d . are for automatic
     
  8. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    Have a look through Reg 416 of BS7671.
     
  9. rich3009
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    rich3009 EF Member

    Location:
    Lincolnshire
    What does bonding and cpc have to do with fault free conditions
     
  10. rich3009
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    rich3009 EF Member

    Location:
    Lincolnshire
    Three of those answers do not offer basic protection
     
  11. Andy78
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    Andy78 Trusted Advisor

    Location:
    Kingston upon Hull
    Basic protection is protection against contact with live parts. Of those answers how many are concerned with live parts ? And of those, which offer basic protection and which don't ?
     
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    • Agree Agree x 1
  12. rich3009
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    rich3009 EF Member

    Location:
    Lincolnshire
    It's a fair point unless you interpret the question as checking your knowledge of the difference between fault and basic protection
     
  13. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    It is posing the question to see if you understand the meaning. Reg 416 will help you.
     
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  14. rich3009
    Offline

    rich3009 EF Member

    Location:
    Lincolnshire
    If a fault occurs in the HV system and a magnitude of fault voltage of 430v occurs between exposed conductive parts and earth on the LV installation, what is the maximum tolerable duration of the fault
     
  15. rich3009
    Offline

    rich3009 EF Member

    Location:
    Lincolnshire
    What part of the regs is this
     
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