MDS Engineering conducted a comprehensive power systems study that included short circuit analysis, protective device coordination, and arc flash hazard assessment for a commercial facility. The analysis was developed using SKM Power Tools for Windows, a trusted platform for electrical modeling and hazard simulations, and adhered to IEEE 1584-2018, NFPA 70E, and ANSI standards.

The short circuit analysis involved calculating available fault currents throughout the electrical distribution system at both utility and equipment-side terminations. At the main 3000A switchboard (MSB), the maximum bolted three-phase fault current was determined to be approximately 39.1 kA at a 480V service, ensuring that the protective devices selected were adequately rated for the worst-case scenarios. These values helped define the withstand and interrupting ratings necessary for equipment such as breakers and panelboards.

Protective device coordination was carefully examined to ensure reliable fault isolation while maintaining power to the remainder of the system. Time-current characteristic (TCC) curves were developed for all major overcurrent protective devices, including low-voltage breakers, fuses, and molded-case circuit breakers. Coordination studies highlighted proper cascading of devices to minimize nuisance tripping and enhance system selectivity, particularly between the main switchboard, downstream distribution panels, and large mechanical loads.

The arc flash hazard analysis provided detailed incident energy values and arc flash boundaries at key equipment locations. At the MSB, the calculated incident energy was approximately 5.6 cal/cm² with an arc flash boundary of 37 inches. Multiple panels across the facility, including mechanical and lighting panels, were assessed with incident energy levels ranging from 0.6 to 6.1 cal/cm². All panels were evaluated under worst-case working distances, and hazard category labeling was provided in accordance with NFPA 70E.

Mitigation strategies included recommendations for appropriate PPE, improved system grounding, and device setting adjustments. The report emphasized the importance of regular updates to the arc flash study in conjunction with system modifications or maintenance. Overall, MDS ensured that the facility met modern electrical safety requirements, reduced downtime risks, and achieved improved personnel protection.