Which of the following tasks must be performed by qualified persons when dealing with electrical equipment?

Servicing or maintenance of electrical equipment must be performed by qualified persons to ensure safety and compliance with the National Electrical Code (NEC) standards. Qualified persons possess the necessary training, expertise, and familiarity with the specific equipment and associated hazards. This ensures that they can safely identify potential risks and implement proper procedures to mitigate them while performing tasks.

These individuals understand the operational principles of electrical systems and how to handle them safely, including recognizing electrical hazards and understanding the proper use of protective equipment. Therefore, when it comes to servicing or maintaining electrical equipment, having a knowledgeable and skilled individual to carry out these tasks is crucial for safeguarding both personnel and property.

While tasks such as repairing electrical circuit boards and testing electrical insulation may also require a skilled hand, they are not as universally mandated to be performed only by qualified persons unless specified for particular circumstances or equipment. Thus, the focus on servicing and maintenance underscores critical safety requirements in the NEC.