J
josey
if there is a 30ma rcd fitted to the cu, covering the whole board, will it do any harm to fit an additional rcd to cover a circuit, i am wiring a power shower and am intending to fit a fcu in the airing cupboard to supply it ( only requires a 3A supply) and thought of fittind a H29 unit (with built in rcd protection), this will ensure the shower is protected bt an rcd, but which unit would you expect to trip first.