Final answer:
The fault current for the 3-phase fault can be derived using Kirchhoff's Laws. Kirchhoff's junction rule can be confirmed by measuring current at three specific points in the circuit. By applying Kirchhoff's rules, the fault current can be determined.
Step-by-step explanation:
The fault current for the 3-phase fault can be derived using Kirchhoff's Laws in electrical circuits. Kirchhoff's junction rule can be directly confirmed by measuring the current at three specific points in the circuit.
By applying Kirchhoff's first or junction rule at point a, we obtain the equation I₁ = I₂ + I₃. Solving this equation along with other relevant equations derived from Kirchhoff's rules will allow us to determine the fault current in the 3-phase fault.