A qualified person is defined in various ways by different standards and depending on what industry you are in.
In the electrical industry, for example, it’s important for both qualified and unqualified workers to understand and receive training for the equipment they are working on. In construction, and electrical construction more specifically, codes and standards define what constitutes a qualified person in the context used within contained requirements. A key point is that workers can be qualified in one area and unqualified in another. Ultimately, it is the responsibility of the employee to understand the limitations of their qualifications and when they are not qualified to perform a particular task.