Students could look at the rapid changes to society that the invention of the internal combustion engine led to. The most obvious intervention was the car. How did the car change the lives of those who could afford one? How did Henry Ford's new manufacturing methods improve the speed of assembly and reduce the cost of production?
Arc Flash is the result of a rapid release of energy due to an arcing fault between a phase bus bar and another phase bus bar, neutral or a ground. During an arc fault the air is the conductor. Arc faults are generally limited to systems where the bus voltage is in excess of 120 volts.
Factors that can cause an arc flash include equipment failure, dust, dropped tools and corrosion. Injuries can be devastating, as arc flash temperatures can reach 35,000Â° F â which is 3 times hotter than the surface of the sun. An arc flash also can produce noise reaching 140 decibels â about as loud as a gunshot â and molten metal shrapnel. âArc flash is a very, very dangerous phenomenon.