Re: What is the dumbest, most destructive mistake you have ever made on one of your t
I think that over the years I have made just about every mistake it's possible to make.
However, the dumbest and most destructive mistake was using GFI on the entire system, twice. The first time, I was away, something cause it to trip, and I came home to a tank of very dead livestock. I went back to non-GFI. Now one mistake can happen.
Years later, the the second time, I figured I'll do this smart, I'll use GFI and install two breakers each one on a different leg. I go away for a few days again, and come home to a tank of very dead live stock. Yep, both of the GFIs tripped out. I don't know if it was multiple events or a single event.
Ever since then, the main return pump runs on a non-GFI circuit. I use an external pump, so there is no power cord in the water, and it's drive is magnetic, so there is no shaft seal to leak.
GFI is great and does offer a lot of protection to you. Lights can easily fall in, power cords to heaters and internal pumps can get brittle on you and crack. Heaters can break. Generally you want to be safe. At the same time, you don't want a false trip of it to cost you your entire setup.