In the U.S., there is no specific national requirement for fuel cell test equipment to be certified. There may be requirements from the local authority having jurisdiction (AHJ). Local building codes will likely point to compliance with NFPA 2/55 for the hydrogen and other gas supply systems, ASME Boiler and Pressure Vessel Code for vessels, ASME B31 piping codes for piping, and National Electric Code for electrical. A conversation with the local authorities early in the planning process to determine what is required will be helpful. Consultation with a design firm for laboratories and factories may also be helpful. It may be possible to show that many test station components already certified to EU standards can meet U.S. requirements with some cross-reference work. Alternately, the AHJ may accept the CE Declaration of Conformity.

Panel members have not encountered a device or area classification for ATEX approval within Canada. ATEX is a European Union directive and is not generally recognized within North American standards. The second link below references a UL similarity. https://news.nilfiskcfm.com/2017/03/atex-certification-applicable-north-america/;    https://www.ul.com/services/atex-certification-european-union. As with any area or device classification, the designer is responsible for demonstrating to any regulatory body or Authority Having Jurisdiction granting approval that the design meets the standard. In addition, every attempt should be made to reference and meet current relevant standards and codes, rather than trying having to apply for exceptions.