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The primary function of a running line in wire installation is to pull several spans of wire at once. In the context of wire installation, especially in the field of telecommunications or electrical work involving overhead lines, a running line facilitates the efficient and effective installation of wire across distances.

When installing multiple sections of wire, it is essential to have a mechanism that allows for the simultaneous pulling of these sections to maintain alignment and ensure that they are properly tensioned. The running line acts as a means to achieve this, making the installation process more streamlined.

In scenarios where other options could be mistakenly considered, holding the wire securely and providing electrical continuity are important factors in wire installation but serve different purposes. The connection of two sections of wire is related to splicing or joining techniques, not the pulling function of a running line. Thus, in the context of wire installation, the ability to efficiently pull various spans aligns most accurately with the primary function of a running line.