NRTL Testing Services

The U.S. electrical codes and standards generally require electrical components and products to be approved. Products that are mass-produced, or components used in machinery should either be Listed or Recognized components.

At NSS we have a working relationship with a United States National Recognized Testing Laboratory (NRTL) that allows us to offer a variety of NRTL related testing and evaluation services.

At NSS, we have a thorough understanding of both the technical and practical requirements for selling products to the United States. We can offer our clients several options, which allow our clients to select the most sensible and cost effective test method for the product and its application. When NRTL testing is required, we can provide services to support these projects ranging from consulting and guidance, testing services in the field or at our laboratory, to complete project management from project initiation through completion.

NRTL Witness Testing
Generally NRTL witness testing is performed on components or products that are not approved by a Nationally Recognized Testing Laboratory. NSS engineers will perform preliminary design review and inspection of your component or system. Once the preliminary review and inspections are completed, NSS performs testing of the component or system and the NRTL representative witnesses the testing. The testing can be performed at the client’s manufacturing facility, or in some cases in our laboratory. If the component or system conforms to the applicable standards and passes all tests, you will receive a letter of conformance and conformity report from the NRTL.

NRTL Component Recognition
NRTL component recognitions are performed on components or products that are a sub-system of a machine or larger system.　NSS can perform a preliminary assessment of the component and then bring the NRTL in to perform the product testing. � The testing can be performed at the client’s manufacturing facility or in some cases in our laboratory. If the component conforms to the applicable standards and passes all tests, the manufacturer can affix the NRTL component recognition label to the product.　Follow up inspections are performed to ensure the product design and construction methods have not changed.　NSS can perform the majority of the follow up inspections on the behalf of the NRTL to reduce project costs.

NRTL Listing
NRTL listing is performed on equipment that can operate or function as a “stand alone” machine or system. The process for NRTL listing is similar to that for Component Recognition projects.