I have an old house with a fuse box on the second floor of the home, and 200A service with breaker box in the basement. The fuse box is fed by a 30A line. The fuse box has 24 fuses and seems to integrate with much of the house.
Today I traced my living room electric with a circuit breaker finder to the fuse box. I unscrewed the fuse and the expected outlets lost power. However, when I passed these outlets and their plugged in items with a noncontact voltage tester, I got the same positive readings one does when the fuse is plugged in. Any ideas on what could cause this?