What does the process of fishwiring involve?

Fishwiring refers to the technique used in electrical and telecommunications work where a thin line, often referred to as the "fishline," is pulled through a conduit or duct. This process is crucial for running additional wires or cables through the duct in subsequent steps. In this context, fishwiring allows for efficient installation because it enables an installer to prepare the pathway for other materials that will be pulled through later on.

The other options describe different processes that are not related to the act of fishwiring. Testing ducts for leaks, cleaning ducts, and sealing ends are maintenance and preparation tasks that might occur but do not encompass the specific action of using a fishline to guide new lines into position. By understanding the definition and application of fishwiring, one can appreciate its importance in the setup and installation of various electrical systems.