room has a electric hand dryer, toilet, light and sink. hot and cold feeds are plastic upto the taps. what should be done for bonding? 4mm between H&C (the copper part), hand dryer and light?
Local supplementary equipotential bonding complying with Regulation 547-03 shall be provided connecting together the terminal of the protective conductor of each circuit supplying Class I and Class II equipment in zones 1, 2 or 3, and extraneous-conductive-parts in these zones including the following:
(ii) metallic central heating pipes and air conditioning systems
(iii) accessible metallic structural parts of the building; (metallic door architraves, window frames and similar parts are not considered to be extraneous-conductive-parts unless they are connected to metallic structural parts of the building)
(iv) metallic baths and metallic shower basins.
The supplementary bonding may be provided in close proximity to the location
Never really understood why you're supposed to bond the CPC of class II equipment. The CPC isn't connected to the class II item, and it won't be exposed, so I don't see the point.
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