Which of the following best describes a line worker's primary responsibility?

The primary responsibility of a line worker is to install, maintain, and repair electrical power systems. This role encompasses a wide range of activities essential for ensuring that electrical distribution systems operate efficiently and safely. Line workers are crucial in working on overhead and underground power lines, as well as transmission and distribution networks. Their hands-on expertise allows them to troubleshoot issues, replace faulty components, and conduct regular maintenance, ensuring the electrical infrastructure is reliable and capable of meeting consumer demands.

The other options describe important aspects of the electrical and utility sectors but do not capture the core duties of a line worker. Assessing customer satisfaction pertains more to customer service roles, while designing electrical systems involves engineering and architectural skills outside the direct responsibilities of line workers. Managing electrical safety regulations focuses on compliance and safety oversight rather than the practical work of installing or maintaining systems. Consequently, the correct choice highlights the specific, focused technical capabilities and responsibilities uniquely associated with a line worker's role in the industry.