What is the most common cause of an arc fault flash?

Answer: Simple human error
Explanation: Most common things are electric heaters

Answer: Simple human error
Explanation: While human error or carelessness of a worker account for the majority of incidents, arc flash can be the result of a wide variety of causes—static electricity, loose connections, or even a rodent in the vicinity that compromises the distance between energized components.

Answer: Other
Explanation: There are several factors that can cause an arc fault flash. Loose connections (can happen over the course of time) can cause overheating. Damaged lamp cords and damaged wiring could also be the cause.

Answer: Other
Explanation: Vacuum cleaners are notorious. Anything with a motor as well. People yanking "on" devices out of outlets.

Answer: Other
Explanation: if there is a load on circuit when disconnected

Answer: Other
Explanation: Romex wiring inside the walls can arch from some thing as simple as a mouse having a snack and exposing the cable

Answer: Improperly configured wire connections
Explanation: Although arc's can happen for a number of reasons, the most common that is seen is from improper termination of wires. Using the proper wire nuts and methods to terminate the wires is very important. Be sure to read the proper uses of the materials you intend to install.

Answer: Overheated wiring connections
Explanation: Electric is not jock

Answer: Other
Explanation: All of the above, along with loose connections, worn installation and many more.