This study determines fault current (a.k.a. short-circuit current) magnitudes throughout an electrical system and evaluates the ratings of installed overcurrent protection devices (i.e. circuit breakers and fuses) to ensure they are sufficient to manage these faults.
If an overcurrent device is subjected to a short-circuit beyond its rating the fault will rapidly heat components to very high temps that can destroy insulation, melt metals, and start fires. If arcing occurs, the device may explode, leading to equipment damage and jeopardizing the safety of your workers. Facilities are advised to identify these hazardous fault points within their system in order to protect equipment and human life.
Accurate one line diagrams and equivalent utility capacity are required for this study. If drawings do not exist, RJS Engineering will perform data collection at your facility and create new one line diagrams.
In order to maintain safety & normal operation in your dynamic facility, it is imperative to update your short-circuit calculations when you install new equipment, or within the NFPA 70E recommended 3-5 years.
A Short-Circuit Study is required for a complete Arc Flash Hazard Analysis.
Overcurrent Protection Device Coordination Study
This study is performed to determine proper coordination of upstream and downstream overcurrent protection devices such as circuit breakers, relays, and fuses. The goal of proper coordination is to localize the overcurrent condition (a hazardous fault current) to restrict outages to the affected circuit or equipment. Proper coordination ensures the safety of the rest of your system when a fault occurs, and is accomplished by the selection of overcurrent protection devices and their ratings and/or settings.
Our Overcurrent Protection Device Study will identify mis-coordination within your electrical system. Our report will provide coordination recommendations for device ratings and settings and, if necessary, device replacement.
In order to maintain safety & normal operation in your dynamic facility, it is imperative to update your overcurrent protection coordination when you install new equipment, or within the NFPA 70E recommended 3-5 years.
An Overcurrent Protection Device Coordination Study is required for a complete Arc Flash Hazard Analysis.