A conduit piston (mouse) is used for what application?

• A. Testing insulation
• B. Installing pull line
• C. Stabilizing conduit
• D. Pulling cable

Answer: (B)

A conduit mouse is used to place a pulling line through a conduit run. It’s pushed or pulled through the conduit so that a lightweight line reaches the far end. Once the mouse exits, you attach the pull line to it and pull the line back through. That pull line then serves as the means to pull the actual cable through the conduit. It’s not for testing insulation, nor for stabilizing the conduit, and the cable is typically pulled after the pull line is in place.