On Tue, 11 Feb 2014 10:42:42 +0000, John Rumm
wrote:

On 11/02/2014 04:47, Bill Wright wrote:
John Rumm wrote:

No need for the 5A FCU. The 6A MCB or 5A fuse will take care of any
overload.

My reason for including it was not for protection of the wiring, but
for adding discrimination if possible.

Use a 1A or 3A fuse then.

Indeed... although it does depend on what the main circuit is protected
with. There are some 10A lighting circuits about which will offer more
scope.

I suspect such circuits would only qualify for the higher 10A rating
when completely wired up with Pyro cabling and appropriate fittings. a
more likely scenarion in commercial premises rather than in premises
of the domestic persuasion (i.e. a house) where the limit has always
been 6A fusing at the CU panel afair.
--
Regards, J B Good