John Rumm wrote:

wrote:

Rewirable fuses are still fully compliant for new installation. You'd
derive very little safety benefit from adding MCBs. The reason the
fuses didnt pop is that any trip device takes a cvertain amount of i
times t to blow, and the fault, while it may have looked impressive,
didnt draw enough i x t, and the fault blew itself open circuit first.
You may have been scared by this, but safetywise its pretty much a non-
issue.

While this is true, there are two caveats worth mentioning: If the
cables are the older style PVC with only a 1mm^2 CPC (modern cable has
1.5mm^2) then it is worth moving away from rewireable fuses since the
protection will be marginal or insufficient in many cases. If the power
(i.e. socket) circuits currently have no RCD protection then again it is
worth introducing this, which realistically will also mean a CU swap.

Are any figures available that show injury and/or deaths rates are
less under the new regime (in this case an RCD CU) than the old (a
fused CU)?

A casual reading of the group suggests that there are a number
potential benefits from the technical advances in going from the
former to the other latter - but how does it work out in practice?