When installing the likes of 32A supply for an outdoor spa, a certain electrical contractors association recommends installing a rotary switch that provides a TT earth for the spa via an earth electrode wired directly into the switch (so divorcing the spa from an installations TN- supply).
An outdoor 2.8kW spa is to be supplied by an IP66 13A socket (from its own type A 16A RCBO) (the spa comes with a supply lead that incorporates a 13A plug and 10mA PRCD moulded into the lead). So, as with a rotary switch being TT earthed, do you see a problem with the socket being TT earthed also (via a Condudisc) (Installation has TN-S supply, but worry is DNO can convert it to TN-C-S)?
Thanks