Which of the following duties should not be performed by a small system operator?

In the context of a small water system operator's duties, wiring electrical components typically requires specialized training and expertise in electrical work, as it involves understanding electrical systems, safety precautions, and compliance with local and national codes. Small system operators often focus on tasks related to water quality, system maintenance, and basic operational monitoring rather than engaging in electrical work that could pose safety risks if not done correctly.

Disinfecting water mains, observing pump motors, and repairing chlorinators are tasks generally expected of small system operators. These responsibilities align with their training and the operational focus of ensuring safe and reliable water distribution. Disinfecting mains ensures water quality, observing pump motors allows for the detection of any operational issues, and repairing chlorinators requires familiarity with the disinfection process that is essential for maintaining safe drinking water standards.

In summary, wiring electrical components represents a task outside the primary competencies of a small system operator, thus making it inappropriate for them to perform.