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Exposed 24VDC in a Bathroom

Hello IET Forum,


I'm hoping someone can point me in the direction of a suitable standard that refers to exposed 24VDC conductors not being appropriate in a bathroom. My client would like to use the two metal hinges of a bathroom cabinet mirror as the +/- conductors; I'm not comfortable with them connecting any electricity through metal hinges, let alone in a bathroom! I've consulted with BS7671:2018; it says up to 30VDC is appropriate for the zone, but that doesn't mean exposed, of course! My client wants me to provide unquestionable evidence as to why they can't do it, but I'm struggling to find anything that isn't open to interpretation. Can anyone help?


The best I can find so far is from IEC 60364-4-41, Annex A.1 “Live parts shall be completely covered with insulation which can only be removed by destruction”.


Kind Regards, Harry
Parents
  • Zoomup:

    Have there been any reports of injuries or fatalities of, say, lorry drivers when changing a blown light bulb on a 24 Volt D.C. lorry lighting system in the rain?


    Z.


    I have been told of of electrocutions on military vehicle electrics, which are more like 28V when in motion, but only in terrible circumstances, where the victim is already badly injured as to provide a low impedance subcutaneous contact, and to be honest death from blood loss was probably inevitable and  speeding it up may well have been a mercy.

    We have no compunction about having parts 28V apart exposed outside to touch at bumper height for jump starting and emergency power on big vehicles like the wolfhound or mastiff.  The centre hole in one of these will take a finger as a loose fit... I do not imagine either of these are situations that really apply to the original post.


    M.


Reply
  • Zoomup:

    Have there been any reports of injuries or fatalities of, say, lorry drivers when changing a blown light bulb on a 24 Volt D.C. lorry lighting system in the rain?


    Z.


    I have been told of of electrocutions on military vehicle electrics, which are more like 28V when in motion, but only in terrible circumstances, where the victim is already badly injured as to provide a low impedance subcutaneous contact, and to be honest death from blood loss was probably inevitable and  speeding it up may well have been a mercy.

    We have no compunction about having parts 28V apart exposed outside to touch at bumper height for jump starting and emergency power on big vehicles like the wolfhound or mastiff.  The centre hole in one of these will take a finger as a loose fit... I do not imagine either of these are situations that really apply to the original post.


    M.


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