Abstract - In an effort to calculate the dan ger of arc flash, which is part of safety and an element of occupational safety and health, it is necessary to carry out an arc flash analysis. This analysis aims to determine the effectiveness of overcurrent protection on installed equipment. This analysis will calculate the value of in incident energy (cal/cm2) associated with a maximum three-phase fault. In the analysis carried out, the value of Fault Clearing Time (FCT) or the time needed to disconnect the device from the sistem when a disturbance occurs.
By considering the incident energy and FCT values in the sistem, it will be easier to choose protective equipment from several manufacturers on the market. Apart from this, another benefit is obtained in the form of knowing and determining the minimum level of personal protective equipment (PPE) or personal protective equipment that must be used, used by workers when carrying out work on electrical equipment in an energized condition. So, by implementing this study, apart from the safety aspect, it also plays a role in increasing worker and company productivity in general. Furthermore, based on the category of the amount of arc flash energy, flash protection boundaries can be identified to determine Personal Protective Equipment (PPE) or personal protective equipment based on NFPA 70E which will be used to minimize and prevent workers and existing equipment from the impact of an arc flash.
In the Fault Clearing Time Simulation, it was found that fixed breakers have trip device protection on their equipment and different manufactures and types will also have different TCC curves which will later affect the incident energy value.
Keywords-arc flash; safety; Personal Protective Equipment; flash protection boundaries; fault arching current; NFPA 70E; arc flash boundary