![]() The results are often violent and when a human is in close proximity to the arc flash, serious injury and even death can occur.Īrc flash can be caused by many things including: Simply put, an arc flash is a phenomenon where a flash over of electric current leaves its intended path and travels through the air from one conductor to another, or to ground. conversions: 1 inch = 25.4 mmm and 0.24 cal/cm 2 = 1 Joule/cm 2Ĭontact Omazaki Consultant if you are looking for consultant services for studying and assessing the hazards and risks of arc flash, especially to calculate the incident energy generated by potential arc flash on your electrical system throughout Indonesia.An arc flash is a short circuit through air that flashes over from one exposed live conductor to another conductor or to ground.t = arcing time in seconds from overcurrent device time current curve.E B = incident energy at the arc flash boundary, typically 1.2 cal/cm 2 or 5 Joules/cm 2.It is always better to place the equipment in an electrically safe condition and not to perform live work. ![]() Work performed within the AFB requires adequate PPE based on NFPA 70E requirements. ![]() This boundary is typically calculated as the distance where the incident energy falls off to 1.2 cal/cm 2. The Arc Flash Boundary (AFB) known as Flash Hazard Boundary in IEEE 1584, is defined as an approach limit at a distance from exposed live parts within which a person could receive a second degree burn if an electrical arc flash were to occur. The clearing time is normally determined from the upstream protective device’s time current curve using the estimated arcing current. The second equation is used to adjust the normalized data to specific conditions. The first equation is used to determine the incident energy based on a normalized working distance of 24 inches and a clearing time of 0.2 seconds. The distance from the source is referred to as working distance. Incident energy is defined as the amount of energy impressed on a surface at a certain distance from the source. The next step is to calculate the incident energy in calories/cm 2 (cal/cm 2).
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