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  1. C

    Earthing Conductor Size- Good?

    That is unless anyone knows the 150*C impedance of the circuit? Is using a k of 226 realistic for 90*C PVC insulation?
  2. C

    Earthing Conductor Size- Good?

    Right, but how do you turn these variables into a number?
  3. C

    Earthing Conductor Size- Good?

    Seems to easy vs the NEC's equation. I'm still confused though, where are they getting 143 as K?
  4. C

    Service Cut and Reconnect

    Oh. Those er tend to be a bit to optional in the US.
  5. C

    Service Cut and Reconnect

    VDE?
  6. C

    Arc Fault Detection going global ...

    In the US a short circuit which produces sputtering of any kind (most faults do) is considered arcing per UL's definition. Paschen's law need not apply.
  7. C

    Arc Fault Detection going global ...

    Thats exactly why AFCIs were created. After it was theorized that 75 amps could be seen at the end of a really long run a 75 amp pickup breaker was created as a concept but soon realization came that certain goods would trip it.
  8. C

    Service Cut and Reconnect

    Came across this video of an overhead cut and reconnect. What do you guys think? Is it done the same way in the UK?
  9. C

    Arc Fault Detection going global ...

    I know some EU micrwaves have this circuit where as US versions do not. EU equipment seems to have much lower inrush than US equipment- in the US you can see the lights dim when a fridge starts or someone turns on a tool/appliance ect. I'd imagine not so in the UK/EU?
  10. C

    Arc Fault Detection going global ...

    That a whole other story altogether...
  11. C

    RCDs in patient care areas

    Does the UK require RCDs in patient care areas? I saw this guide for Australia and it appears that 10ma RCDs are mandated in Aus? https://electricaltestingcompany.com.au/wp/wp-content/uploads/2019/01/Body-2018-rev-C.pdf In the US GFCIs are not required, and where GFCI would be required like...
  12. C

    Arc Fault Detection going global ...

    Its alright :) Sadly AFCIs stop looking for serial currents below 5 amps. Not sure about UK AFDDs.
  13. C

    Arc Fault Detection going global ...

    Serial arcing is the end stage of joule heating, that is assuming combustion has not already ensued.
  14. C

    Arc Fault Detection going global ...

    Parallel arc faults involve very high currents, limited only by Zs in domestic installations.
  15. C

    Arc Fault Detection going global ...

    Where the above PDF lead to the 3 PDFs I've attached below. Lowering the magnetic trip value on single pole US breakers worked well, until it was theorized that in long circuit runs with a high Ze short circuit currents in US home wiring could be as low as 75 amps at the furthest point in the...
  16. C

    Arc Fault Detection going global ...

    See the attached PDF:
  17. C

    Arc Fault Detection going global ...

    Earth fault loop impedance, solenoid coils in MCBs, RCDs and fused plugs.
  18. C

    Arc Fault Detection going global ...

    Serial arcing is the end stage of joule heating, assuming combustion has not already initiated.
  19. C

    Arc Fault Detection going global ...

    AFDDs are redundant at best in the IEC market. Period. I know because thats exactly what UL and manufacturers were imitating when they created them. By their own admission EU/AS/NZ wiring practices already detect arcing faults.
  20. C

    Earthing Conductor Size- Good?

    I'm elated to know that you can see it. Not everyone can. AFCIs and GFCIs are being applied to fix a problem that the NFPA will not admit to. I'd be banned for saying it on a US forum, but the NFPA should not be writing electrical codes. 60 years of ignorance regarding basic electrical theory...

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