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Hi there, Client want to install a tesla wall charger inside the garage in a location that backs onto the outdoor meter box. The MSB is located inside the garage as well but on a different wall some 8 meters away. There is no room on the MSB to put in a Type B RCCB without upgrading the size of the switchboard. (currently a DBF30). Is there any rules that stop me from installing a 32A MCB at the MSB and then installing the RCCB inside the meter box? I will then be able to drill through the back of the meter box through to the wall charger inside the garage. Understand that if the RCCB trips, the client will need to go outside to reset it. Also, is the 32A MCB at the MSB satisfactory to be the lockable isolator? Thanks

Just read the standard and looks like the RCD must be installed at the Origin of the final subcircuit.

While you're designing the swbd upgrade; think about the mains as well.
EV charging is counted as 100% towards maximum demand of the installation, so effectively you'll be adding a significant amount to the overall MD, and the existing mains may not be able to cope.