Is supplementary earthing required nowadays in a bathroom where: (1) all devices are connected to a 30mA RCD and (2) all water outlets use copper piping with no breaks that can be traced back to an earthed pipe?
The bathroom has two central heating pipes and hot/cold pipes ( all earthed at the boiler traceable to the main incoming earth point). All circuits protected by 30mA rcd. Currently there is no supplementary bonding hence my question.
