What additional gauge range is specified for 140?

The correct answer pertains to the additional gauge range specified for 140, which is 3/0-397.5. This range refers to the wire gauge sizes and their corresponding maximum current-carrying capacities in amperes, specifically suited for certain applications, such as electrical installations or transmission lines.

Using a 3/0 gauge wire allows for handling higher current levels while maintaining safe temperature limits for the wire. In this case, the 397.5 amperes figure indicates the maximum amperage that can be safely conducted through the wire without risking overheating or damage.

Understanding the wire gauge system is crucial for linemen, as different gauges can significantly affect performance, safety, and the longevity of the electrical systems being worked on. The specified range ensures that linemen choose the appropriate wire size for specific operational requirements, thereby adhering to safety standards and effective power distribution practices.