本标准描述了组成1E级系统或与1E级系统相关的电路和设备的独立性要求。它规定了可通过冗余电路和设备的物理隔离和电气隔离来实现的独立性标准，但没有说明什么是冗余的。

This standard describes the independence requirements of the circuits and equipment comprising or associated with Class 1E systems. It sets forth criteria for the independence that can be achieved by physical separation and electrical isolation of redundant circuits and equipment that are redundant, but does not address the determination of what is to be considered redundant.