On Tue, 18 Jul 2006 15:59:57 +0100, David Hansen wrote:

snip

The "electricity board" fuses do not
obey different laws of engineering to the ones you can buy.

Err, yes they do. Or to be more accurate, they will tend to have a
different fusing characteristic. In very general terms, the Distribution
Companies will be using fuses that are capable of passing a sustained
overload without undue degradation but will be fast-operating in the event
of a short-circuit.

Memory fails me now, but it's all to do with fuse-class ratings. I had a
browse but info about it is sparse on the web.

--
the dot wanderer at tesco dot net