Quote:
Originally Posted by GMB
I believe that the standard mains fuse values were carefully chosen so that the smallest one in a chain usually blows first.
It's about a factor of 3 to get this effect, hence 100A master with 30A ring and 13A on the plug and even 3A or 5A plugged into an extension.
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I've seen a similar layout ,with different values though on telecomms transmission racks .The unusual thing we found was that where you'd expect the smallest to go first , at times it would be some way down the chain that one would go .This was with the manufacturers rated fuses in all places .Asked power staff to explain - they couldn't ,but had experienced it themselves .