[The document will not include a purpose clause] The purpose of this standard is to address the special requirements, voltage ranges, and application practices of the North American Utility and Industrial market for high voltage gas-insulated substations, providing guidance for both users and manufacturers. Developed by a joint working group of The Substation and Switchgear Committees it brings together in one place the expertise from both groups and the information before covered in multiple locations into one document. This document also, where feasible, aligns with international norms and standards and recognizes international practices used outside North America. It will therefore provide a comprehensive standard with widespread application.