Outdoor Sockets - Wiring Question

vaio

zax47 wrote: »

……………There is little point adding another RCD in there - you can't have two of the same 30mA rating on the same circuit anyway - which would trip first? This means he would have to change the supply side RCD to a 100mA one and be sure it ONLY supplied that hot tub circuit - a waste of time, money and effort.

You can’t guarantee discrimination between 30 & 100mA devices, with a fault over 100mA they’ll both trip. You could use a time delayed one upstream which will ignore the fault for 100mS which gives the downstream device chance to clear the fault.