![]() The incident energy associated with an Arc Flash event is the thermal energy (measured in cal/cm2) at a working distance from the arc fault. It’s noted that equipment that needs trouble shooting is no longer “normally operating”. Under normal operating conditions, enclosed energized equipment that has been properly installed and maintained is not likely to pose an arc flash hazard.” “An Arc Flash hazard may exist when energized electrical conductors or circuit parts are exposed or when they are within equipment in a guarded or enclosed condition, provided a person is interacting with the equipment in such a manner that could cause an electric arc. Light intensity as much as 2000 times normal office lighting. ![]() Temperatures can reach as great as 20,000-35,000˚C, with volumetric expansion as great as 40,000-67,000 times. An Arc Flash can occur because of environmental conditions (dust, condensation), normal/abnormal wear-and-tear (material failure, corrosion), or personnel (dropping tools, accidental touching). The ways in which workers and equipment can be protected from Arc Flashes are specified below.Ī flashover event where electric current leaves its intended path and travels through the air from one conductor to another, or to ground. ![]() Because Arc Flashes create such hazardous conditions, warning labels, protective clothing, and special field measures have to be taken to mitigate risk. It also outlines best practices for limiting the probability of Arc Flashes occurring and harming workers interacting with the equipment. ![]() The following Arc Flash study defines what an arc flash is and why it is dangerous. ![]()
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