Which of the following is NOT a nationally recognized testing laboratory?

• A. UL (Underwriters Laboratories)
• B. CSA (Canadian Standards Association)
• C. ETL (Intertek)
• D. NEC

Answer: (D)

Nationally recognized testing laboratories are organizations that OSHA recognizes to test and certify products for safety, allowing them to carry an NRTL mark. Labs like UL, CSA, and ETL perform evaluations, issue certifications, and provide marks that show a product meets safety standards.

The National Electrical Code, on the other hand, is a safety standard published by NFPA. It defines electrical safety requirements but does not test or certify products. That’s why it isn’t a testing laboratory.

So, the item that is not a nationally recognized testing laboratory is the NEC.