This document defines the construction, safety, and performance requirements of modular or factory-matched hydrogen gas generation appliances, herein referred to as hydrogen generators, using electrochemical reactions to electrolyze water to produce hydrogen. This document is applicable to hydrogen generators that use the following types of ion transport medium: — group of aqueous bases; — group of aqueous acids; — solid polymeric materials with acidic function group additions, such as acid proton exchange membrane (PEM); — solid polymeric materials with basic function group additions, such as anion exchange membrane (AEM). This document is applicable to hydrogen generators intended for industrial and commercial uses, and indoor and outdoor residential use in sheltered areas, such as carports, garages, utility rooms and similar areas of a residence. Hydrogen generators that can also be used to generate electricity, such as reversible fuel cells, are excluded from the scope of this document. Residential hydrogen generators that also supply oxygen as a product are excluded from the scope of this document.
ISO 22734 was published in September 2019. This edition combined ISO 22734-1:2008 (Industrial and Commercial Applications) and ISO 22734-2 (Residential Applications) Under consideration for updating with proposed convenor, Lawrence Moulthrop of Proton On Site; June 2020. Available at https://www.iso.org/standard/69212.html. The CSA B22734 - Hydrogen generators using water electrolysis — Industrial, commercial, and residential applications, (a North American adoption of ISO 22734:2019, with revisions) document was approved by ballot and will be moved to the final accreditation steps, quality review, and publication. The document is expected to be published in January 2023.