What must be done to the exposed open ends of underground cable during construction?

During construction, the exposed open ends of underground cable must be protected with end caps to prevent moisture, dirt, and other contaminants from entering the cable. This is crucial because any debris or water that penetrates the cable can lead to corrosion or insulation breakdown, resulting in potential failure of the cable once it is energized.

End caps serve as a reliable barrier, ensuring that the internal components of the cable remain intact and functional until the cable is connected to the network or system. This practice is a standard safety measure in underground construction projects to maintain the integrity and longevity of the cabling system.

Other choices do not adequately protect the cable's exposed ends; for example, leaving them opened to air could invite moisture and debris, while sealing with duct tape may not provide a secure or lasting form of protection. Marking them with warning flags serves as a visual cue but does not prevent damage, highlighting why the use of end caps is the appropriate action during this stage.