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Ok Back to my original idea. The 2nd CU wont need to draw more than 45A, so put a 16mm T&E (to be on the safe side) from the 2nd CU to a 45A RCBO in the Main CU. Bring all the earths to a central block then into the PME & Earth Stake. Replace the main CU with a split load box...

Cheers for the responses. I was thinking of doing as you said using a henley block, with 63A RCD's isolating each CU (Not using a DP isolator anywhere in the system). But I would have to use a 100A RCD between the henley block and the meter to stop the total max load !=> 100A (2x 63A). Is...

Hello All, We are just about to start renovation work including an extension on a 500 Year old house, and I think the electrics must have been installed when it was first built they're that bad! At the moment there is a new(ish) 100A Feed (Installed bout 6 years ago) marked "PME System". The...

Cheers Everyone! So from all of that ive concluded that the best thng to do is to swap the 32A MCB for a 20A and move it over to the non RCD protected side of the consumer unit. Im changing to 20A as these are the only two sockets on the ring that will ever be used, and my equipment should...

Hello, Quick Question, wel quite long actually I have 2 quite large UPS's at my office, each connected to one 240v 13A double socket on a ring main protected by a 32A MCB. These are the only two devices on the ring main. There is then an RCD that protectes all of the MCB's in the...