i am planning to change my old wire type fuses to the mcbs available
from screwfix.the ones which you simply exchange for the old fuse
without having to replace the cu.
has anybody used these ? are they any good or would it be more
advisable to change the whole cu?
thanks for any comments
They are much better than the wire fuses. However, it is more advisable to
replace the whole CU. OTOH, if you don't fancy replacing the CU, then it is
much better to replace the fuses than leave alone. If you replace the CU,
you can use RCBOs or a split load unit, which will make the installation
much safer still.
If you don't replace the CU, at least have a good look at the old
one. The spring contacts can develop high resistance, resulting in
heating and damage to the insulating material supporting the contacts
and insulation on the cable. If there's any sign of this, you must
replace the CU. Also I would slightly slacken off and retighen all the
connection screws to ensure good contact is maintained over time.
all firstname.lastname@example.org (mark al) wrote in message
You need to be aware that not all re-wirable fuses are mechanically
compatible with these MCBs. I bought one of these MCBs just to check
the idea out and found that it had a different prong arrangement and
would not fit into either a 1930s style C.U., a 1960s style C.U. or a
1980s style C.U.
On Wed, 19 Nov 2003 15:20:26 -0000, "Christian McArdle"
Bakelite was around then.
As an aside, there's plenty of houses here (Ireland) still wired with an
old pattern Siemens fusebox which I'm pretty sure has its origins in the
30s or even earlier. Round ceramic fuseholding caps with replaceable
cartridges screwed into ceramic bodies.
I recall seeing one of these old fuseholders in a prog about U-boats...
I would expect ceramic and wood, and quite possibly still in good
But if the CU is 1930s, what age is the rest of the wiring? Such old
kit has usually deteriorated so badly that any electrician seeing it
in the 1930s would have condemned it then, let alone judging it by
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