Short-Circuit, Protective Device Coordination Studies, and Arc-Flash Hazard Analyses must be performed per the requirements in NFPA 70E. Our experienced engineers will work closely with facility personnel to provide accurate and complete analyses. A comprehensive report will be provided discussing the results of the study, identifying potential problems and providing recommendations.
Short Circuit Study
A Short Circuit Study (SCS) is required to establish minimum equipment ratings for power system components to withstand the mechanical and thermal stresses that occur during a fault as mandated by article 110.9 of NEC 2008. Also required by the NEC are nameplate markings of the SCS ratings on equipment. These include industrial control panels (409.110), industrial machinery (670.3[A]), HVAC equipment (440.4[B]), meter disconnect switches (230.82), and motor controllers (430.8).
The goal of a protective device coordination study is to determine overcurrent device settings that maximize selectivity and power system reliability while minimizing the potential incident energy. In a well-coordinated protective device scheme, faults are cleared by the nearest upstream protective device. This minimizes the portion of the electrical distribution system that is interrupted as a result of a fault or other disturbance, and facilitates the troubleshooting process.
Arc Flash Study
An arc-flash is a ball of fire resulting from an electrical fault where current flows through the air. Recognition of this hazard has increased emphasis on safety standards and is changing the traditional approach to maintenance and repair. An Arc Flash Study is required by NFPA 70E to establish the arc flash hazard level and the PPE required when working at electrical equipment. Following the Arc Flash Study, the code also requires that arc flash labels be attached to all panels in the electrical distribution system.