Which component is NOT one of the four main components in a stringing operation?

In the context of a stringing operation, the four main components typically include the tensioner, stringing blocks, puller, and sometimes a few other tools designed specifically for the task of stringing wire or cable. Each of these components plays an essential role; for example, the tensioner maintains proper tension in the cable to ensure it is not too loose or too tight, while the puller is responsible for drawing the cable into position.

The transformer, while it is an important device in electrical systems for adjusting voltage levels, does not factor into the processes specific to stringing operations. Its function does not align with the mechanical aspects required to install overhead lines or cables. Therefore, identifying the transformer as not being one of the primary components highlights an understanding of what tools and equipment are essential for the stringing operation itself.