Just around the corner from us, they finished replacing seawall panels from Irma damage. One of our friends lost the feed to his boat lift so he stopped by to get some help. We replace the pipe, pulled in wire and I terminated the wires on the breaker. I had to go but all that was left was to splice three wires in JB at the seawall. He said he could finish no problem.
A few hours later he called and said, "Bad news. The fuse blew." (He's 77 and still calls breakers fuses ) So he undid the splices, checked for shorts, but everything was okay. I asked him if the breaker tripped as soon as he turned it on. He said, "No. When I turned it on it was fine but when I pushed the reset button it blew."
Then I said, "Bob, that's not a reset button, it's a test button and is found on all GFI breakers. You push it to see if it's working. If it trips, it's working. The bad news is you did all that troubleshooting work for nothing."
"Oh. Guess I'll have to put it all back together now." He has a very wry sense of humor.