Short answer, Yes NRTL approval is required
The IECEx Certificate of Conformity (CoC) is not accepted. However, the IECEx Test Report (ExTR) containing the test data can be used by an OSHA NRTL to support NRTL approval in the US. The "Ex" requirements are fairly consistent between the IEC and US standards with some national differences, but the US additionally requires the ordinary location requirements (mainly the electrical safety) to be part of the certification whereas, in the rest of the world, this is often by manufacturer's self-declaration >From OSHA Ditective If the applicant organization or NRTL accepts inspections and test data from organizations that function as part of the International Electrotechnical Commission System for certification to standards relating to equipment for use in Explosive Atmospheres (IECEx Scheme), the NRTL (including, as applicable, the applicant organization, once the application for NRTL recognition is approved) shall: i. be recognized by OSHA for a test standard that is harmonized with the one being accepted under the IECEx Scheme; ii. physically inspect (i.e., perform a hands-on inspection of ) a representative sample of each product for which the applicant organization or NRTL intends to accept inspection and test data as part of the IECEx Scheme, to confirm that the product is that which has been evaluated in the IECEx Scheme and that the results from the IECEx Scheme evaluation are still valid. A representative sample can be a product, a model, a type, a representative member of a product family, or any other grouping, so long as the grouping is representative of the product being certified. A sample is representative if the grouping of which the sample is a part is based on the same or equivalent product manufacturing characteristics or technical requirements; iii. review each IECEx test certificate (ExCB) and IECEx test report (ExTR) to determine that the correct test standards have been used and that any United States of America national differences have been applied; iv. use procedures for evaluation and interpretation of results; v. determine that components used comply with the policies adopted in compliance with Annex B Section 7.4.G and H; and vi. ensure compliance with Annex B Section 7.9 Bill William G Lawrence, P.E. | US Technical Advisor, IEC TC31 68 Indian Memorial Dr South Yarmouth MA 02664 M: +1 (1) 508 776 5444 E: <mailto:[email protected]> [email protected] From: Boštjan Glavič <[email protected]> Sent: Thursday, September 25, 2025 3:07 PM To: [email protected] Subject: [PSES] HazLoc approval Dear experts, Short question. Is HazLoc certification by NRTL required for product used in potential explosive atmosphere in US? Or is it enough to have IECEx certification with US national differences? Thank you. Best regards Bostjan Sent from Outlook for Android <https://aka.ms/AAb9ysg> _____ This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to [email protected] <mailto:[email protected]> All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/[email protected]/ <https://www.mail-archive.com/[email protected]/%20> Website: https://ewh.ieee.org/soc/pses/ <https://ewh.ieee.org/soc/pses/> Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe) <https://ewh.ieee.org/soc/pses/list.html> List rules: https://pses.ieee.org/wp-content/uploads/2024/12/EM-PSTC-List-Rules.pdf For help, send mail to the list administrators: Mike Sherman at: [email protected] <mailto:[email protected]> Rick Linford at: [email protected] <mailto:[email protected]> For policy questions, send mail to: Jim Bacher at: [email protected] <mailto:[email protected]> _____ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC <https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1> &A=1 - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to [email protected] All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/[email protected]/ Website: https://ewh.ieee.org/soc/pses/ Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe) List rules: https://pses.ieee.org/wp-content/uploads/2024/12/EM-PSTC-List-Rules.pdf For help, send mail to the list administrators: Mike Sherman at: [email protected] Rick Linford at: [email protected] For policy questions, send mail to: Jim Bacher: <[email protected]> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
