SHORT CIRCUIT, COORDINATION STUDIES AND ARC FLASH

The studies typically include the accurate modeling of Uninterruptible Power Supply (UPS) Systems, emergency generator systems, automatic transfer switches, static transfer switches and power distribution units.

 

SHORT CIRCUIT STUDY includes determining the short-circuit current available at each component of the electrical system from the main electrical service to the last major device. Once the short circuit is calculated the ability of the component to withstand and/or interrupt the current is determined.

 

COORDINATION STUDY includes determining protective device characteristics, settings, or sizes that provide a balance between equipment protection and selective device operation that is optimum for the electrical system.

 

ARC FLASH EVALUATION includes determining arc-flash incident energy levels and flash protection boundary distances based on the results of the short circuit and coordination study. Perform the analysis under worst-case arc-flash conditions for all modes of operation. Perform arc flash evaluation utilizing both NFPA 70E and IEEE 1584A methods of calculation.