S A F E T I T U D E

Arc Flash Boundary (AFB)

Electrical related accidents are most severest one owing to its invincible and fatal-result characteristics. The extensive use of electricity almost everywhere as risk-escalating factor makes the things even worse. It is important to know that working on live low voltage (220V) installation is not alone dangerous but also working near live energized one is equally risky. Therefore, an understanding of Arc Flash Boundary becomes of prime importance.

The following brief knowledge help you understand about AFB

An energy exposure of 1.2 calories per centimeter squared (Cal/cm2) is the widely accepted incident energy value considered to be where the onset of a second-degree burn could occur. The AFB must be determined as part of an arc flash risk assessment and a requirement for arc flash labels. It can be calculated using an equation defined by IEEE 1584—IEEE Guide for Performing Arc Flash Hazard Calculations. The calculation is based on using the results of the normalized incident-energy calculations from part 3 of this series, and the rate at which the incident energy decreases with distance is defined by the distance exponent X standard. The distance exponent is a function of both voltage and the type of equipment.


The IEEE 1584 equation for the AFB is:
D = [(4.184 × C × E × (t/0.2) × (610 /E)]1/x.

(Courtesy from on-line publication)
#electrical #Arcflashboundary #risk

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