Today, I was in a hospital. Someone told me that there is a falt in a large washing machine. This fault caused all the CB's in the panel to trip.
The panel has many circuit breakers of different capacities/rated current (10A, 16A, 20A, 25A, and 32A). There is also main CB about 80A as much as I recall.
I checked the panel by myself and all CB were closed. It was just a small issue and he just thought that they are all open. Now, I wonder why did he think of this. Can something like that happen?
What I think is that only the CB of the washing machine will trip in case of a falt. If it did not trip, only the main CB (80A) will trip. Am I right? Are there any situations in which all the circuit breakers trip as a response to that single fault?