It's compulsary in new installation.
but not in old ones.
All new circuits will need to comply to 17th eds.
Ask your electrician if it would make more sense to either replace if possible the protective devices to RCBOs or have new CU installed.
theres no particular need to change to a new box, however, your installing spark may have difficulty installing some of the new circuits unless the whole installation is up to 17th ed standards, i.e. with a new box. it depends on your scope of works.
the regs are never applied retrospectivley, hence why people have an old rewireable fuse box still inplace. however new works must be up to the current regs which may mean a new board has to be put in.
Hi, interesting question as it depends on what is in your existing consumer unit. EG. is it covered by an RCD?
As effectively any new circuits must have RCD protection, if one not there then easiest way to comply would be a board change now.
If there is an RCD then it may not need upgrading if spare 'ways' available, until/unless you want to sell house when a PIR would 'strongly recommend' a change to multiple RCD/RCBO's.
No body can insist on an upgrade, but your leckie who is going to have to certify/register the work for building regs. Part P. may decline the work unless you do have a new board & possibly new main earth bonding.
They are only mandatory, for new installation and rewires. some boxes may date back to the 14th/15th editions but as long as they are safe and no new circuits installed would not need RCD/RCBO and would be classified as code 4 that means does not comply to 17th eds but that does not mean it is not safe or illegal.
With one RCD covering a number of circuits as your board has this could cause nuisances tripping, so i'd asume it is a split board and some circuits are not RCD protected. Think about replacing those MCBs on the non protected side with RCBOs.
This will be compliant with 17th eds
It will never be compulsory to change & there are several million installations using a single RCD, mine included.
However whilst having work done anyway it would probably be cheaper as part of other works whilst leckie on site to do it now, if only because one set of certs. not two,