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Some times I see two sizes smaller suggested, but, normally, it is four

Dawg, to clarify, An 8 gauge circuit protected by an 12 ga FL (12-8= 4, that's 4 math numbers difference) and gauges are even #'s so an 12 ga FL is 2 (ga) sizes smaller than an 8 ga circuit (12-10-8= 2 sizes different). So would that be 4 sizes or 2 sizes

live every 24 hour block of time like it's your last day on earth