In article ,
sm_jamieson writes:
3. If I find an RCD is tripping all the time on some circuit having
installed the new CU, can you get a slot-in "normal fuse" to use
temporarily until you have time to investigate and fix ?

If you have space to mount both CU's, then you can temporarily
wire the new one from a spare high current way in the old one.
Then you can try each of the circuits on the new CU and fix any
such RCD issues. Depending on your total loading, you could
leave some or all the circuits on the new CU (might have to leave
a cooker and/or shower behind), and then have the tails moved
across when you already know all the circuits work.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]