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How to connect a earth leakage detection GFCI/ELCB?

My specifications are as follows: 2 in phase 120V lines 1 Neutral 1 Ground So, I should use a 240V GFCI, right ? This is the one I plan to use: Heavy Duty - High Power GFCIs part no- 23250 003-1 ...
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Flow rate of water in a gutter system

I am attempting to build a waterfall out of a gutter system. I currently have an awning that is 72" by 48" with 3" high (tentatively) buffers on each side to keep the water from flowing off. The ...