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Looking over the exam specs at https://ncees.org/wp-content/uploads/Power-April-2018.pdf, I realized the largest section of the exam is the Protection subheading of the T&D category. Protection has 13 of the 80 questions - more even than code lookups, which have 12. I think this category is easy to overlook because you can practice fault current calculations and circuit analysis until your calculator is mad at you, but conceptual questions are often harder to prepare for, and we only have a few days left before Friday the 13th! My suspicion is that the questions in this category are mostly conceptual, so I think it would be great to have a thread about good resources and example problems on this subject. I'll start by listing some concepts we should all be familiar with. Anybody, please chime in with an example problem, concept to know, resource to print out, or whatever you have. : What is the purpose of power system protection? : What are the major categories of power system protective equipment and schemes used in transmission and distribution systems?