CHAPTER 4 - Nationally Recognized Testing Laboratories (NRTLs)

Abstract

Before examining the role of Nationally Recognized Testing Laboratories (NRTLs), some terms associated with those types of organizations should be examined. NRTLs play a significant role in certifying that materials, equipment, and products meet the requirements of the codes and standards by which they were produced. Authorities Having Jurisdiction (AHJ) generally require that material, equipment, or products used must be approved/certified/listed by an NRTL. This raises a significant question. How is an organization established as an NRTL? The United States Department of Labor, Occupational Safety, and Health Administration has established a Final Rule regarding certification of NRTLs. Directive Number CPL 01-00-003, NRTL Program Policies, Procedures, and Guidelines, were established to certify NRTLs. One important role played by NRTLs is their development of testing standards. The three NRTL organizations most often referenced for standards in the United States are Underwriters' Laboratories, Inc. (UL); Canadian Standards Association (CSA), and Factory Mutual (FM). All of these organizations develop testing standards for other types of equipment, as well as electrical equipment.