When does an electrical anomaly become a fault? Often the weakest part on a low voltage system is the insulation. Do you know the temperature rating for general purpose PVC insulation?
Illustration of induced eddy currents on the location bolt holding the transformer conductors: Do you know the cause and solutions to this type of anomaly?
A basic example of high resistance on each of the phase conductors:
Modern electrical panels are often designed with limited access to the conductors, it can sometimes be difficult to determine if there is a load or resistive condition. Good us of Span and Level can sometimes help. Do you know what Span and Level are and how they work?