IEC 60709:2018适用于核电厂仪表和控制（I&C）以及电气系统和设备，其功能需要独立，因为它们有助于: 冗余或多样化的安全组； 不同深度的防御； 不同的安全等级以及非分类（NC）系统。 本标准也适用于作为对安全重要的I&C和*电气系统一部分的临时装置（例如，用于调试测试和实验的辅助设备或移动电源系统）。 ？ 与上一版相比，此新版本包括以下重大技术变更: 包括与对安全重要的电气系统中的分离原则有关的要求； 以通用方式定义I&C和电气系统的分离标准； 与原子能机构文件的新修订保持一致，并扩大范围，将分离的其他方面包括在内。

IEC 60709:2018 is applicable to nuclear power plant instrumentation and control (I&C) and electrical systems and equipment, whose functions are required to be independent due to their contribution to:

• a redundant or diverse safety group;
• different defence in depth levels;
• different safety classes and also with non-classified (NC) systems.

This standard is also applicable to temporary installations which are part of those I&C and *electrical systems important to safety (for example, auxiliary equipment for commissioning tests and experiments or mobile power supply systems).
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This new edition includes the following significant technical changes with respect to the previous edition:

• include requirements referring to the separation principle in electrical systems important to safety;
• define separation criteria for I&C and electrical systems in a generic way;
• align with the new revisions of IAEA documents and broaden the scope to include other aspects of separation.