What are the reasons for excessive current flowing through a circuit?

Short circuit: Due to faulty insulation or overheating, live wire comes in contact with neutral wire. 
Fuses and circuit breakers are designed to open a circuit when an excess amount of current occurs, so as to break that flow of current.A circuit breaker or fuse. 
The best indication of excessive current flow in an electrical circuit is if a protective fuse blows or a circuit breaker trips. Fuses and circuit breakers are designed to open a circuit when an excess amount of current occurs, so as to break that flow of current.
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