RCD supply to the socket, earth electrode, current ratings, voltage drop, loads of things - you may have remembered them or not, from your post it is hard to tell, more data on your design please.


Is the house supply TNC-s? If it is TT or TNS, you do not need to island the caravan and can just extend the house wiring as it is.


If house is TNC-s and you are creating a TT island, then assuming power is going outside in SWA, then earth the armour at the house end, so the PME still protects the cable against damage, but at the caravan end, use a large stuffing gland and isolate the armour,  taking an earth from a local electrode into the caravan.

RCD supply to the socket, earth electrode, current ratings, voltage drop, loads of things - you may have remembered them or not, from your post it is hard to tell, more data on your design please.


Is the house supply TNC-s? If it is TT or TNS, you do not need to island the caravan and can just extend the house wiring as it is.


If house is TNC-s and you are creating a TT island, then assuming power is going outside in SWA, then earth the armour at the house end, so the PME still protects the cable against damage, but at the caravan end, use a large stuffing gland and isolate the armour,  taking an earth from a local electrode into the caravan.