Normal fuses are rated such that when 2.1 times their nominal current rating
is passed they will break within 30s. So, a normal 20A fuse will not break
until it is passing >40A and even then it will take a long time to go,
enough to fry the rig. The fuse is there to protect the cable when a gross
overload occurs, eg a dead short across the power cable entry; perhaps when
you drop a spanner in the works : o (
David
G3UNA
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