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They're talking about high-amperage circuit protection. Here's the reference to their primer.
The "80% rule" is described midway down and below.
Note that with regard to short-circuit protection, they say that "Precise sizing of short circuit protection is not critical," and that fuse ratings up to 150% of the wire rating may be used.
Choosing Circuit Protection - Resources - Blue Sea Systems
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Last edited by btrayfors; 09-13-2011 at 10:02 AM.