What is the primary responsibility of a lineman in the installation of streetlights?

The primary responsibility of a lineman in the installation of streetlights revolves around installing, connecting, and maintaining components of street lighting systems. This role is crucial as it involves not only the physical setup of the lighting fixtures but also ensuring that they are properly connected to the electrical supply. Linemen must be knowledgeable about the electrical systems and safety protocols involved in working with streetlights, which contributes to safety and functionality in public spaces. Their work ensures that streetlights operate effectively, improving visibility and safety for drivers and pedestrians alike.

Other responsibilities mentioned in the incorrect options, such as connecting utility poles to the electricity grid or testing voltage levels, are more specific to other aspects of electrical infrastructure, rather than directly related to the specialized task of streetlight installation. Operating heavy machinery for street construction, while it may be part of the broader field, is not directly related to the lineman's core duties concerning street lighting.