I'm trying to determine if this is an actual short or an intentional thing.
There are two fuses in my home's fusebox that both seem to control the same circuit. Only one of them can be on at a time. When we try to turn on both, the opposite fuse breaks. I've tested all of the related switches and plugs and can't find anywhere that the two circuits are wired together. I noticed this symbol on the label for circuit 20 but I have no idea what it means and a google search wasn't helpful.
Can any of you identify it?
Should both of these fuses be able to be turned on at the same time?