"Owain" wrote in message
...
"Rick Hughes" wrote
| I am, wiring up a load of new ccts .....I have 2 CU's and arranged
| to provide 3 discrimination classes - no RCD protection, 30mA RCD
| protection, and 100mA protection.

Why? If you have TT earthing then *everything* should be on 100mA and
sockets on 30mA.

Supply is PME ( TN-C-S)