A protective system for a cast saw includes a voltage source and a processor coupled to the voltage source. The processor is configured to apply a voltage to a saw blade of a cast saw. The processor is also configured to receive a voltage reading taken across a conductive layer that is at least partially embedded in a cast. The processor is also configured to determine whether the received voltage reading exceeds a threshold voltage. Responsive to a determination that the received voltage exceeds the threshold voltage, the processor is further configured to activate an alarm to warn a user of the cast saw that the saw blade is in contact with the conductive layer.