In our home, we have two electrical panels. One main panel (in the basement) and a sub panel on the first floor. The lights to the kitchen on the first floor run to a breaker in this sub panel.
We installed a dimmer incorrectly and accidentally tripped the breaker in the sub panel. However, at the same time, the main panel in the basement shutoff and the entire electrical system shut down.
It was our understanding that when you cause a short, it would cause only the one breaker to trip, but not the entire system.
This has made us wonder if our main/sub panel setup is functioning correctly, or if there is an issue that requires further investigation. The installation of the sub/main panel was done by certified electricians.