« Reply #2 on: April 05, 2015, 02:37:20 pm »
Not sure what you mean by a "short". An overused word, often used out of context.
GFCIs do not provide over current protection. That is what breakers are for. If you exceed the current level for the branch circuit the breaker should trip.
GFCI's look for ground faults. They are meant to trip if anything over 5mA of leakage current flows to ground. GFCIs determine leakage current by comparing the current on the hot line to the neutral line. If they differ by greater than 5mA they are supposed to trip. GFCIs trip with a leakage current 5mA (vs. 15A for breaker) or 1/3000 of a 15A breaker over current protection.
GFCIs should not be seen as some sort of electrical safety net emboldening you to do something you wouldn't do without a GFCI. That's how people die.
p.s. I suspect the FS20Z-1 is not outdoor rated so that application is likely non compliant as well.

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