![]() ![]() The arc flash boundary can be reduced by using devices that limit the fault current or clear the fault faster, such as current-limiting fuses, fast-acting circuit breakers, or arc flash relays.The arc flash boundary can vary depending on the type, size, and configuration of the electrical equipment, as well as the available fault current and the clearing time of the protective devices.The arc flash boundary is based on the incident energy level of 1.2 cal/cm², which is the threshold for the onset of a second-degree burn.If you enter this information in incorrectly, the arc flash boundary that is measured will be incorrect, and employees and the entire facility will be at greater danger. Regardless of what method you choose, or even if you use the software, you must be absolutely certain that you have the voltages correct. IEEE 1584 – This option uses an empirically-based formula that uses lab-tested information, and is typically seen as more accurate than the NFPA option.NFPA 70E – NFPA 70E offers a formula for calculating the incident energy of a machine.Looking each one up will provide you with the exact calculations needed to get the distances. If your business doesn’t have this software, or wants to double check the results manually, there are two main methods of calculating the boundary. approach distances calculator for energized equipment makes it easy. This will provide accurate information that can be used to set the distances in your facility.Ĭalculate your minimum approach distance (MADs) Most companies will use software programs where they can enter in the voltage information about a piece of equipment, and it will calculate the arc flash boundary automatically. The exact method of calculation is different for AC and DC systems as well, so it is critical to have this information available. How to Calculate the Arc Flash BoundaryĬalculating an arc flash boundary is going to be based on the voltage of the equipment that would cause the arc flash. When they are performing this task, here are the things that they will need to do. Calculating where the boundary will be in any given situation is something that should be done by an electrical engineer. This is the level at which it will cause only second-degree burns rather than third-degree. An arc flash boundary is the distance from the equipment in question to the point where the energy that would be present in an arc flash is 1.2 cal/cm2. ![]()
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