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Another funny from the AMD 2 draft for comment - bathrooms, arms are getting shorter.

As I peruse the AMD2  files to see what else has changed I see that the requirements for 13A sockets in a bathroom seem to have magically shrunk from 3m to 2.5m to the edge of Zone 1.

(Edit For background the 3m rule came in formally in the 17th edition - prior to that there had been a blanket ban on sockets in bathrooms since 1950, and then in the 15th edition we had a special clause added to allow sockets at 2.5m in bedrooms with an en-suite, and then part way through the 16th edition the numbered bathroom zones 0, 1,2 and 3 came in, later to be simplified to the current  0, 1, 2 and 'outside the zones'  system.)


I suspect this latest change is based on nothing very much other than the fact the rest of the planet manages them a lot closer than that and they have no issues in practice (outside zone 2, and in a location away from water and steam seems a lowest common denominator, though RCD requirements vary), rather than perhaps that hair dryers being sold with shorter cords than before, or people's ability to spread their arms is reducing  as the general population becomes more overweight.

701.512.3

..........

Except for SELV socket-outlets complying with Section 414 and shaver supply units complying with BS EN

61558-2-5, socket-outlets are prohibited within a distance of 2.5 m horizontally from the boundary of zone 1.



Personally I think this is a move in the right direction, given the small risks with RCD protection, but until it reduces to about 1.8m, it is still no use in my own bathroom ?.

Parents
  • BUT - why is the Ground Fault Interruptor working, and in one of the cases I cited the RCD didn't trip?


    Well - they are using a metal drain in the example.


    Unfortunately for the vast majority of us, we have plastic baths with plastic drains ... so in this particular case, there's no "residual current" in Class II appliances, because there's no protective earth circuit for current to travel back up ... it all returns through the Neutral, "fooling" the RCD. Very different, when you're suspended in a plastic bath with plastic pipes, to normal the Class II appliance situation, where if you touch a live conductor it flows through your feet or anything else you're touching.


    The L-N current through salt water may not cause operation of an overcurrent protective device due to L-N short (this was demonstrated in the YouTube video) ...  but the electric field can travel from L and N to the heart ...
Reply
  • BUT - why is the Ground Fault Interruptor working, and in one of the cases I cited the RCD didn't trip?


    Well - they are using a metal drain in the example.


    Unfortunately for the vast majority of us, we have plastic baths with plastic drains ... so in this particular case, there's no "residual current" in Class II appliances, because there's no protective earth circuit for current to travel back up ... it all returns through the Neutral, "fooling" the RCD. Very different, when you're suspended in a plastic bath with plastic pipes, to normal the Class II appliance situation, where if you touch a live conductor it flows through your feet or anything else you're touching.


    The L-N current through salt water may not cause operation of an overcurrent protective device due to L-N short (this was demonstrated in the YouTube video) ...  but the electric field can travel from L and N to the heart ...
Children
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