It may also help us realize that a qualified individual should be the one making these calculations. Understanding the math behind this and how calculated short-circuit currents are used can only broaden knowledge and understanding. Whether you are a designer, installer or inspector, you will at some point in your career be faced with calculating available fault current. The National Electrical Code demands this data point for enforcement of such Sections as 110.9, Interrupting Rating 110.10 Circuit Impedance, Short-Circuit Current Ratings, and other Characteristics and 110.24 Available Fault Current. Available short-circuit current is used in many other applications as well. Maximum available short-circuit current is an important parameter for every power distribution system as it provides a data point necessary to ensure equipment is being applied within its rating and the system is performing to meet expectations. I trust this article will satisfy inquiring minds with details around calculating available fault current and provide some equations for the student to explore. I have received many requests ever since to get into the math. The September – October 2012 issue of IAEI magazine included an article titled “Going to Basics, Maximum Fault Current” which spoke to this topic but did not get into the math. One of the most fundamental calculations made on a power distribution system is that which yields available short-circuit current.
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