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  1. R

    Difficult overload omissions question

    Very poor exam question
  2. R

    Difficult overload omissions question

    I'm edging towards fire Panel supplies as they have battery backup and warnings of power failure
  3. R

    Difficult overload omissions question

    As would the others
  4. R

    Difficult overload omissions question

    According to regs no 3 would present a danger if de-energised, plus the question asks which circuit is not allowed to have overload protection omitted, exciter circuits are clearly defined as being ok for Omission in 433.3.3
  5. R

    Difficult overload omissions question

    Q12 Omission for circuit protection against overload may not be given to which of the following: 1. Fire Panel supplies 2. Control circuit for fire extinguishing equipment 3. Exciter circuits for rotating machines 4.Supply circuits for lifting magnets I'm guessing it's the control circuit but...
  6. R

    Reduced low voltage?

    is it because you would get 110 to earth
  7. R

    Reduced low voltage?

    3. An a.c. voltage of 90V between conductors is classified as a. extra-low voltage b. low voltage c. safety extra-low voltage d. reduced low voltage Why cant this voltage fall into the category reduced low voltage, defined as a voltage the doesn't exceed 110v (the answer however is low.)
  8. R

    Long method de rating factors

    Having used Amtech for so long I can't remember if the de rating factors are applied to the design current or the tabulated regs current, can anyone give me a refresher example calc, I guess it has to be tabulated if it's a current reducing factor
  9. R

    Disconnection times for finals

    Old sparkies not up to date, test sheet was done yesterday
  10. R

    Disconnection times for finals

    No its interior office lighting
  11. R

    Disconnection times for finals

    I have two in front of me from different contractors both have lighting at 5 secs max is this something from the 16th edition brigade
  12. R

    Disconnection times for finals

    Lighting is a final circuit less than 32
  13. R

    Disconnection times for finals

    Just received a completed test sheet from an installer on a TN system with the max permitted disconnection time column filled in for the lighting circuit and 20A heater circuit as 5secs, surely 0.4
  14. R

    18th Edition Regulations exam study

    It's all a bloody con,
  15. R

    General characteristics

    Or is 0.1s 100ms in real money crap at decimal conversion
  16. R

    General characteristics

    Is it 10ms based on greater than 400v on a TN system and tolerated as in human heart, I thought it was cable fire. duh
  17. R

    General characteristics

    Doesn't help
  18. R

    General characteristics

    Do you know the answer and how it's derived
  19. R

    General characteristics

    25) 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 a) 10ms b) 100ms c) 200ms d) 300ms I don't know how to answer this one
  20. R

    General characteristics

    What part of the regs is this

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