I would like to upgrade my consumer unit so that I have a few more fuseways and RCD protection on some circuits. The main electricity company fuse is a 60 amp one, and the current CU is rated at 60A. A quick perusal of the Screwfix catalogue does not reveal anything suitable rated at less than 80A. Am I OK in using an 80A CU without having the whole supply upgraded?
Thinking about this I presume that the fuse is there partly to protect the CU, so having an underrated fuse is OK in that the fuse will blow before the CU bursts into flames, please tell me if this is faulty logic.
I have a fair bit of DIY experience in wiring in new sockets and lighting circuits - is replacing the CU a suitable DIY task, would you say? The wiring doesn't look like rocket science to me, but is there post-installation testing which should be done (in which case I'll just call in a pro).
Many thanks,
Martin