This reviewed Volume 1 book has been updated to help applicators in application environments. It is written for engineers with in-depth simple MUMU meaning novice ideology of Essentials of science, Safety requirement for installation, Transformer generic principle with maximum short circuit current determination method, Switchgears design principle with associated calculation method including CT knee point & ALF, Fault level calculation on network using various methods, Importance of power factor correction on networks with savvies calculation, Generator invention history and fault lever determination and numerous Feeder relaying selectivity coordination methods.