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QUICKY question to resolve a dispute, haha! (a clue would be... a DSO / other near a sink)...

Tomgunn
Hiya, I know everyone's busy so this is a QUICKY!!


How far, (if any), does a DSO / SSO / Sw'd Spur etc... have to be away from a kitchen sink?


Fanks... ?


regards... 


  • 0
    ebee:

    "have to be away from a kitchen sink "


    Depends on all circumstances in the situation installed Tomm, not a fixed dimension in the regs (all of guidances are worth considering.)


    Thanks again for good advice as with all of the other replies too.


    Thanks everyone!!


    regards...


  • 0
    davezawadi (David Stone):

    You are a bit behind the times UKPN, the "bond everything" 15th edition was found to increase danger (particularly in commercial kitchens), as they became conductive environments. Why would you want to bond an otherwise unconnected conductive part anyway, why not bond the saucepans?


    Hiya, that's fair enough but, as you state more to do with 'commercial' kitchens BUT... why not earth EVERYTHING, (including the steel pans, haha)???


    WHAT, if there was a damaged cable that was touching some pipework that wasn't bonded???


    BRING BACK RYB, hahaha!!


    cheers...


  • 0
    OMS:

    Although it has to be said, that if you have say a commercial kitchen, and you re establish a zone of protection by bonding extraneous conductive parts back to the earth terminal on the kitchen DB (which is local to the kitchen) you will substantially reduce touch voltages  - the basis physics says so.


    That doesn't mean bonding the legs of moveable tables and the like, I agree - but as a principle re establishing that zone of protection is no bad thing


    Regards


    OMS


    See my other questions, further down...


    regards...


  • 0
    WHAT, if there was a damaged cable that was touching some pipework that wasn't bonded???

    Just the same as if a person was touching a damaged cable. I hope no-one's suggesting we start bonding them!  I think the emphasis these days is on keeping the cables in good condition and not running them next to pipework in the first place, let alone squeezed through the same hole in a joist and so on. The responsibility for dealing with electrical faults should be within the electrical system - rather than trying to chase them all around the house via and old bit of metalwork that other trades might or might not have supplied and may or may not alter (e.g. with plastic joints) when our backs are turned.


    Plus of course earthing/bonding everything in sight can often increase shock risk - by creating a path to earth for the victim where might not have been one before.


       - Andy.
  • 0
    There are however some domestic installations where bonding the person to ground makes sense, but I'd suggest these occur quite rarely.cf47e98137f875207dc055888e8b87ed-original-telsa.jpg


    A touch over a megavolt here at ~100KHz, but average current of less than milli-amps path completes by body capacitance to ground and from ground to underside of HV coil.

    I wonder if it would trip an AFDD ?
  • 0
    mapj1:

    There are however some domestic installations where bonding the person to ground makes sense, but I'd suggest these occur quite rarely.cf47e98137f875207dc055888e8b87ed-original-telsa.jpg


    A touch over a megavolt here at ~100KHz, but average current of less than milli-amps path completes by body capacitance to ground and from ground to underside of HV coil.

    I wonder if it would trip an AFDD ?


    I want one for my house!!!


    As per usual... lots of interesting replies, thanks!!


    regards...


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