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  1. C

    Circuit Wire For Long Run

    Disconnection times.
  2. C

    Circuit Wire For Long Run

    Reason I ask about disconnection times is that the ground around an energized lamp goes up in voltage (not my pic):
  3. C

    Circuit Wire For Long Run

    Does BS7671 allow an RCD to meet disconnection times in TN? I just can't bring myself to do it.
  4. C

    Circuit Wire For Long Run

    Your guess is as good as mine :) FWIW I'm getting a minimum size of 33.62mm2 copper Phase and Earth.
  5. C

    Circuit Wire For Long Run

    Right, but a trip and reclose from then utility would engage all of them at once I think. Do you have the ohms value for each conductor?
  6. C

    Circuit Wire For Long Run

    Thnaks, but I don't want to use an RCD for disconnection. RCDs can fail and all disconnection in TN systems must be done by the breaker (MCB) itself.
  7. C

    Circuit Wire For Long Run

    Ok, say you've got a lighting run with the last fixture being 1,280 meters away. 1,800 watts per phase 3 phase, 277/480Y volts though in this example we can use 230/400Y for the ease of discussion. My question is- what size wire do I run for each phase and earth? What disconnection time do I...
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    1617360309073.png

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  9. C

    Arc Fault Detection going global ...

    I did, he said they are likely to become mandated next amendment.
  10. C

    Arc Fault Detection going global ...

    There is no cost benefit. They are just an empty fire extinguisher. EFLI and plug fuses provide 100% parallel and earth arc fault coverage. That leaves serial events, where arcing is the end stage of joule heating assuming combustion has not already started. 90% of all electrical fires start...
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    Arc Fault Detection going global ...

    You kidding? The trojan horse emptied its contents: The goal is 7 billion people living with AFCIs.
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    1617341024006.png

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  13. C

    Zone 1, 2 and 3

    Thanks Julie and Loz2754! :)
  14. C

    Zone 1, 2 and 3

    BS7671 rules which are whole other universe compared to NFPA-70.
  15. C

    Zone 1, 2 and 3

    Where do RCDs fit into all this? Are they effected by either zone or IP rating?
  16. C

    Zone 1, 2 and 3

    Makes sense. Is there by chance a table of what combinations are allowable?
  17. C

    Zone 1, 2 and 3

    What is Zone 1, 2 and 3 in wet locations? What does class 1 mean? Can someone educate on why, what and how this applies to kitchens and bathrooms?
  18. C

    63 amp socket Table 41.1

    Sadly, not everyone follows the regs, standards or understands what they are doing.
  19. C

    63 amp socket Table 41.1

    India has one of the most beautiful electrical systems on earth, minus all the DIY of course.
  20. C

    63 amp socket Table 41.1

    My understanding is that in India, all final circuits are required to disconnect in 0.4 seconds or less. Personally I like the idea. An exception for 5 seconds is needed for sub circuits though- 60 amp life safety feeder must selectively coordinate with the final OCPDs.

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