Nationally Recognized Testing Laboratory is the term used by the United States Occupational Safety and Health Administration to identify third-party organizations that have the necessary qualifications to perform safety testing and certification of products covered within OSHA and each organization's scopes.
The range of products covered is limited to those items for which OSHA safety standards require "certification" by an NRTL.
NEW: On October 1, 2019, OSHA published an update to the NRTL Program Policies, Procedures, and Guidelines as CPL 01-00-004.
This Directive sets forth policies, procedures, and interpretations that supplement and clarify the Nationally Recognized Testing Laboratory (NRTL) Program regulation, 29 CFR 1910.7 and Appendix A to that section.
OSHA, an agency of the United States Department of Labor, publishes a list of Nationally Recognized Testing Laboratories.