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  1. John Lundrigan

    Help with reading site plans for wiring regs

    Thanks Baker 1988, that was a really helpful response.
  2. John Lundrigan

    Help with reading site plans for wiring regs

    Yes, I understand that, but the question is assessing the ability to make that guesstimate so I wanted to know if that was the correct process.
  3. John Lundrigan

    I'm confused about Type C Breaker Disconnection Times

    Hi All, When I consult Table 41.3 for a Type C Breaker rated 16A I see s max Zs of 1.37 Ohms. However this value is defined for both a 0.4s AND 5s disconnection time. This is obviously correct so I am missing something. Fig 3A5 also shows the table 0.1s to 5s. Can anyone explain please...
  4. John Lundrigan

    Help with reading site plans for wiring regs

    Hi Westward, The only vertical information I have is the heights of the structure.
  5. John Lundrigan

    Help with reading site plans for wiring regs

    Thanks Andy
  6. John Lundrigan

    Help with reading site plans for wiring regs

    Hi All, I am hoping to that someone might be able to point me in the direction of a suitable resource that will help me interpret the details of site electrical plan that will allow me to get the necessary details that I can use for cable calculations. I came across this issue when I was...
  7. John Lundrigan

    Advice on a BS 7671 exam question please

    Well said, for the examiner it is a matter of choosing distracting options that are not outrageously wrong and this question does it quite well; although recovery voltage would never exceed the normal supply.
  8. John Lundrigan

    Advice on a BS 7671 exam question please

    Any break in an electrical circuit will give rise to a change of current and this will cause an induced voltage. The larger the rate at which this collapses and the part of the cycle at which the break occurs could give a disturbances. In fact any switching will have some effect that way.
  9. John Lundrigan

    Advice on a BS 7671 exam question please

    Yes, I agree that the wording is important and I'm certainly very happy that answer (c) is the only intended correct result But circuit breakers can cause very substantial electrical disturbances. I only ask the question because I have to explain why that particular option is wrong. In most...
  10. John Lundrigan

    Advice on a BS 7671 exam question please

    It's nice to know that you concur with answer (c) as being correct. But what is your opinion of option (b)?
  11. John Lundrigan

    Advice on a BS 7671 exam question please

    Hi All, I am researching advice to give to candidates for the Regs exam. I came across the following question: 1. The fundamental principles of BS7671 state that persons and livestock shall be protected against injury as a consequence of over voltages originating from a. motors...
  12. John Lundrigan

    A free apprentice resource for 17th Edition

    Nice to hear Marti. I owe a lot to the members here. I would also appreciate you passing the word on - colleagues, friends, college etc. Jonel
  13. John Lundrigan

    A free apprentice resource for 17th Edition

    That's fantastic ashrow. It's made the timespent on the coding worthwhile because I thought the statistics would be important for confidence in taking the exam. I'd love to hear your feedback on the tutorial as well as the tests. Also, I would be grateful if you could post a message on this...
  14. John Lundrigan

    A free apprentice resource for 17th Edition

    Hi all, I am a retired engineering professional and I recently got involved in helping my grandson with his 17th Edition. Well I decided to provide some help with the aid of some software (and some assistance from members of this forum). Like most projects, what started as a simple idea just...
  15. John Lundrigan

    I am confused over the wording of Regulation 411.1

    Thank you all. Very helpful
  16. John Lundrigan

    I am confused over the wording of Regulation 411.1

    OK, I will do that. Jonel
  17. John Lundrigan

    I am confused over the wording of Regulation 411.1

    Well, to continue you analogy :- Large green chicken is a protective measure in which: (i) basic protection is provided by basic insulation of live parts or by barriers or enclosures, in accordance with Section 416, and (ii) fault protection is provided by protective earthing, protective...
  18. John Lundrigan

    I am confused over the wording of Regulation 411.1

    I understand all of what you refer to, that was not the point of my original post. Automatic disconnection is being defined by on the very first line of Regulation 411.1. If Protective Equipotential bonding is not strictly necessary then what regulation 411.1 is really saying is that Automatic...
  19. John Lundrigan

    I am confused over the wording of Regulation 411.1

    I understand but if ADS is being defined as requiring (i) and (ii) then why is the phrase ADS used again in (ii), This then becomes recursive and includes basic protection again. So, I feel that the semantics of the definition are confusing. Jonel
  20. John Lundrigan

    I am confused over the wording of Regulation 411.1

    Regulation 411.1 states that: Automatic disconnection of supply is a protective measure in which: (i) basic protection is provided by basic insulation of live parts or by barriers or enclosures, in accordance with Section 416, and (ii) fault protection is provided by protective earthing...

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