All electrical equipment and products covered by Article 680 must be _____.

The correct answer is that all electrical equipment and products covered by Article 680 must be "Listed." This means that the equipment has been tested and evaluated by a nationally recognized testing laboratory (NRTL) to ensure that it meets specific safety standards and is suitable for the intended use in areas such as pools and spas.

Listing signifies compliance with certain safety and performance criteria, which is crucial for mitigating hazards in wet or damp environments typically associated with swimming pools, hot tubs, and similar installations. The NEC emphasizes the importance of using only products that are recognized for their safety features, especially when they are installed in conditions that may involve higher risks of electrical shock.

While terms like "Approved," "Coded," and "Certified" may imply some level of quality or safety assurance, they do not have the specific legal and regulatory implications that "Listed" does within the context of electrical installations according to the NEC. Therefore, understanding that listing is part of a broader safety framework is vital for compliance and safety in electrical work related to aquatic facilities.