IEC 62855:2016提供了核电厂（NPP）交流和DC电力系统分析的电工工程指南，以证明电源和配电系统具有核电厂安全运行和关闭的能力，在预期的运行事件或事故条件后使其处于受控状态，并最终达到安全状态。本标准预期用于: -用于验证新核电厂的设计； -证明在运行中的核电厂对电力系统进行重大改造的充分性和影响； -以及需要评估和建立现有工厂的操作限制和约束。

IEC 62855:2016 provides the electrotechnical engineering guidelines for analysis of AC and DC electrical power systems in nuclear power plants (NPPs) in order to demonstrate that the power sources and the distribution systems have the capability for safe operation and shut down of the NPP, bringing it to a controlled state after an anticipated operational occurrence or accident conditions and finally reaching a safe state. This standard is intended to be used:
- for verification of the design of new nuclear power plants;
- for demonstrating the adequacy and impact of major modifications of electrical power systems in operating nuclear power plants;
- and where there is a requirement to assess and establish operating limits and constraints for existing plants.