The problem with the US system is that it's not clear at what point the fuse
will blow. A 15 amp US fuse will not blow at 15.5, 16 or even necessarily 20
amps. It's guaranteed not to blow at the rating shown on it.
> George Richardson wrote:
> > The US standards are different and I must admit, not as clears as the UK.
> I definitely agree that they are different, US fuses are marked with
> "maximum carry current", while UK fuses are marked with "minimum blow
> current". I'm not sure where the factor of 2 comes from though, many US
> fuses have a minimum blow rating that is less than twice the marked
> I don't agree that the UK system is necessarily clearer. In the US, a
> 15 amp circuit takes a 15 amp fuse and I can safely plug in 15 amps of
> load. All of the conductors, switches, outlets, etc. in that circuit
> are rated to carry 15 amps. Seems pretty clear to me ...
> But of course, it's just possible that I am biased <g>
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