When a circuit breaker trips due to overloads, short circuits, or ground fault surges. Overloads happen when too many electrical devices draw power at once. A hot wire touching a neutral wire is what causes short circuits. Ground faults occur when a hot wire touches a grounded or metal box. So, this only explains why it is time to call for an electrical panel upgrade contractor in Calgary, as they will have the skills and the tools to help you repair the problem in no time.