For background: Our stage lights are dimmed by three NRD8000 packs. Recently, on two channels, the internal fuses blew but not the outside breaker. I know the dimmers have not been overloaded, there are only two 575W lamps on each channel. When I went to replace the fuse, I noticed that the solder anchoring the fuse holder in place had been flowing out. With 10 amps flowing, that discolored the board. My first question is why do the fuses blow at 10 amps when they are rated for 15? Has anyone else experienced this failure mode and what did you do?