Short Circuit Current Calculation | Transformer to LV Panel, SMDB & DB Explained

In this video, we calculate short circuit current step by step starting from the transformer and moving to the LV Panel, SMDB, and final Distribution Board. You will learn: • How to calculate full load current of a transformer • How to calculate short circuit current at transformer LV side • How cable resistance and reactance reduce fault current • How to calculate total impedance in the system • How to select the correct short circuit breaking capacity of breakers • Why safety margin is applied during breaker selection, not during calculation This practical example uses real cable catalogue values and explains the complete mathematical process in a simple and clear way. This tutorial is useful for electrical engineers, technicians, students, and anyone involved in electrical design and protection systems. Watch till the end to understand how to confidently justify breaker selection and fault level calculations in real projects. By Rashid iqubal