On Wed, 03 Jan 2018 01:38:36 +0000, Bill Wright wrote:

On 03/01/2018 00:46, wrote:

But any mains fuse below 3A does fail in time.


NT


Not when the load is constant and small. I fitted 2A or 3A fuses at
every one of the thousands of TV distribution head-ends and repeaters I
built between 1975 and 2015 and there was no problem with spurious fuse
breaks.

Our 34 year old central heating system is still on its original 3A fuse
and I have a reasonable expectation that the fuse will outlive the boiler
even if it lasts another 16 years or more (assuming the system doesn't
suffer an electrical fault in the meantime).

--
Johnny B Good