“Building system” means plans, specifications, and documentation for a system of manufactured building, or for a type or a system of building components, which may include structural, electrical, mechanical, plumbing, and fire protection systems and other systems affecting health and safety, including variations which are submitted as part of the building system.
Source:
Section 19967.1, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=HSC§ionNum=19967.1..