Does a ring with RCB protection need a designated earth or can it terminate through the conduit?

[Radar Liam]

Hello

I am adding a couple of sockets to an old industrial installation. I am replacing the existing sockets and adding two more into the ring. The installation is earthed through the metal conduit and an RCB has been retrofitted to the circuit after the old style fuse board. Is it sufficient to terminate my earth from the sockets to the conduit or do I need to run a new designated earth back to the fuse board.

I will at some point replace the fuse board with a modern CU

Thanks

Liam

 

[westward10]

If the continuity is good then the conduit is fine as the cpc.