住宅和楼宇电子系统（HBES）及楼宇自动化和控制系统（BACS） 第4部分：预期集成在HBES和BACS中的产品的一般功能安全要求

Home and building electronic systems (HBES) and building automation and control systems (BACS)—Part 4: General functional safety requirements for products intended to be integrated in HBES and BACS