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Arc flash boundary3/20/2024 There are often several available methods to reduce the overall Incident Energy levels of your facility’s equipment.The best way to manage high Incident Energy levels is to reduce them through engineering controls.Proper planning could limit or avoid these impacts. It’s important to know exactly where equipment with higher Arc flash Boundaries are located, in order to determine how personnel or production could be impacted if live work is needed on that equipment.It is critical for unprotected personnel to be made aware of where these boundaries are, through signs, barricades, and other related measures. These boundaries only apply when energized parts within the equipment are exposed (i.e. The higher the Incident Energy levels, the longer the Arc Flash Boundaries must be (in blue).1.2 cal/cm 2 is equivalent to a second-degree burn, so you certainly want to be outside that defined boundary. Arc flash Boundaries are calculated to ensure that no Incident Energy greater than 1.2 cal/cm 2 will be felt outside that distance from the exposed energized equipment.Arc Flash Boundaries are critical to keeping unprotected personnel safe.Where you see Trip times close to or equal to 2 seconds, the current protection is not sufficient for extinguishing the available arcing fault current, and that protection should be reviewed and adjusted accordingly.The high Incident Energy values (in red) correspond to the higher Trip/Delay times, with 2.0 seconds typically being the maximum amount of clearing time most modeling software allows for energy calculations.This is typically accomplished through upstream fuses or protective relays tripping an upstream disconnecting device. The Trip/Delay time is the amount of time it takes the current protection to extinguish or clear an arcing fault.The Lower the Trip/Delay time, the lower the Incident Energy.Steps should be taken to avoid working on this equipment live, or apply engineering controls to reduce incident energy levels and/or live exposure.
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