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Nationally Recognized Testing Laboratory Program

Welcome to the Nationally Recognized Testing Laboratory (NRTL) Program. Workplace product safety is a critical component of workplace safety and both the construction and general industry OSHA electrical standards contain requirements for certain products to be tested and certified by an NRTL. NRTLs are private sector organizations that are recognized by OSHA to perform this certification. Each NRTL has a scope of test standards that they are recognized for, and each NRTL uses its own unique registered certification mark(s) to designate product conformance to the applicable product safety test standards. After certifying a product, the NRTL authorizes the manufacturer to apply a registered certification mark to the product. If the certification is done under the NRTL program, this mark signifies that the NRTL tested and certified the product, and that the product complies with the requirements of one or more appropriate product safety test standards. Users of the product can generally rely on the mark as evidence that the product complies with the applicable OSHA approval requirement(s) and is safe for use in the workplace.

Program Resources

Organizations Currently Recognized by OSHA as NRTLs

The pages below include information about the NRTL (such as the list of standards, sites, and programs that OSHA has recognized for the NRTL).


*Accessibility Assistance: Contact OSHA's Directorate of Technical Support and Emergency Management at (202) 639-2300 for assistance accessing PDF materials.

All other documents, that are not PDF materials or formatted for the web, are available as Microsoft Office® formats and videos and are noted accordingly. If additional assistance is needed with reading, reviewing or accessing these documents or any figures and illustrations, please also contact OSHA's Directorate of Technical Support and Emergency Management at (202) 639-2300.

**eBooks - EPUB is the most common format for e-Books. If you use a Sony Reader, a Nook, or an iPad you can download the EPUB file format. If you use a Kindle, you can download the MOBI file format.

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