An important use of a hot stick is to perform which of the following actions?

A hot stick, also known as an insulating stick or live-line tool, is primarily used for working on energized electrical equipment from a safe distance. Its main function is to allow electrical workers to handle high-voltage lines or equipment without the risk of electrical shock.

The correct action associated with a hot stick involves tasks that maintain safety while working on energized lines, not simply replacing fuses. The hot stick can help with functions such as switching, but it is not directly used for replacing fuses, which typically require isolating the system and ensuring that power is completely disconnected.

Measuring electrical current or installing new circuits usually requires tools that allow for direct access to the wiring or equipment, which contradicts the primary safety purpose of a hot stick. Therefore, while a hot stick is versatile in high-voltage applications, it is not specifically designed for the tasks in question.