Which of the following descriptions would NOT be classified as a qualified system designer?

The description that would not classify a person as a qualified system designer is based on the specific criteria that define qualification in the context of system design. While being certified by a nationally recognized certification organization can indicate a level of competency, it does not inherently encompass the comprehensive experience or specific educational background often required to be considered a qualified system designer.

A licensed electrical engineer brings formal education and a professional license that demonstrates their capability in design, a person with a national certification likely has met rigorous standards in a specific field, and a contractor with substantial experience has practical knowledge that is crucial in design work. Each of these options includes qualifications that are typically recognized as indicators of a system designer's proficiency. In contrast, certification alone, without additional context regarding experience or formal education, may not provide the full spectrum of expertise needed for system design, thus distinguishing it from the other descriptions.