Which of the following would NOT typically be found in a power system?

In a power system, insulation materials play a crucial role in ensuring safety and preventing electrical faults. These materials are essential because they help to isolate conductive components, protect against short circuits, and maintain the integrity of the electrical system by preventing unintended current flow. Therefore, it is incorrect to state that insulation materials would not typically be found in a power system.

On the other hand, fuse holders, electromagnetic interference filters, and voltage regulators are all components that play specific roles in managing and protecting the power system's electrical flow. Fuse holders provide a safe way to contain fuses that protect circuits from overcurrent conditions. Electromagnetic interference filters are utilized to reduce noise and improve the quality of electrical signals, while voltage regulators ensure that the output voltage remains stable despite variations in input voltage or load conditions.

Understanding the function of these components highlights that insulation materials are indeed a typical and essential part of power systems, contributing significantly to their safe and effective operation.