Which of the following entities is NOT commonly associated with electrical equipment certification?

The National Fire Protection Association (NFPA) is primarily focused on fire safety and prevention standards and does not directly engage in the certification of electrical equipment. While the NFPA produces codes and standards related to fire safety that may encompass electrical installations, its role differs from organizations like UL, ETL, or NRTL, which specifically test and certify electrical products for safety, performance, and compliance with various standards.

In contrast, entities such as NRTL, UL, and ETL are all recognized for their active roles in testing and certifying electrical equipment to ensure they meet safety regulations and standards. These organizations perform rigorous evaluations and provide validation that products are safe for consumer use, making them essential in the electrical equipment certification process.