On Mon, 29 Jan 2018 14:48:18 +0000, dennis@home wrote:

On 29/01/2018 14:38, jim wrote:
"dennis@home" Wrote in message:
On 29/01/2018 13:05, jim wrote:

Does retrofitting mcbs into an older wylex "fuse wire" consumer
unit need notification?

The plug in ones don't have the same breaking capacity as te fuse wire
so you may need to check they are OK.

The plug in MCBs (if that's what you are using) can't cope with as much
fault current as the more common MCBs or fuse wire.

Utter ********.
Typical 'old style' Wylex plug in BS3871 breakers have a fault capacity
of 3000A. Typical plug in open wired fuses are 1000A, or 2000A for larger
ones.

If they are having fuses blow then maybe the circuits need fixing rather
than making them easier to reset without fixing them. I can't see why
they would blow for decades.

True.