80amp. 63amp RCD Split

[Ketley]

Can anybody supply me with the correct advice? I have a 17th edition split consumer unit with 1 x 100mA main switch, 1 x 80amp 30mA RCD and 1 x 63amp 30mA RCD. I realise that any down stream fuse cannot be larger than the RCD it follows, but is this the accumilation of MCB's after the RCD or is it just a single MCB (allowing for diversity).

ie.. If I have a 63amp RCD and place 3 x 32amp MCB's downstream would this potentially harm the RCD??

 

[sparks1234]

Can anybody supply me with the correct advice? I have a 17th edition split consumer unit with 1 x 100mA main switch, 1 x 80amp 30mA RCD and 1 x 63amp 30mA RCD. I realise that any down stream fuse cannot be larger than the RCD it follows, but is this the accumilation of MCB's after the RCD or is it just a single MCB (allowing for diversity).

ie.. If I have a 63amp RCD and place 3 x 32amp MCB's downstream would this potentially harm the RCD??

I dont suppose you are the first to install a consumer unit like that, not a probelm, don't worry about it