We still use Ring circuits here, albeit for use in Caravan Parks, over large areas like we have here, the circuit is run in either
4mm Single Phase or 2.5mm2 Three Phase, spread equally over the number of points on the circuit.
These Ring circuits are fed via a Selective type RCD(100mA), with 30mA Personal protection RCD's at each Trailer Park point.
Standard over here is the use of CEE 17(Blue), for connection of Caravans.
All of the wiring is run in Neutral-Screened
cable, buried direct.
Also, the minimum length for a Caravan lead is 10 metres, with no joins. [Linked Image]