包括第5条“保护系统”和第9条“一般警报”。 IEC 60231系列标准不再是最新的，IEC不会对其进行修订。目前保留这些标准是为了参考书目，因为它们过去曾用于仍在运行的核电厂的设计。

Includes Clause 5, Protection system, and Clause 9, General alarms. The IEC 60231 series of standards is no longer up-to-date and will not be revised by IEC. The standards are maintained for the time being for bibliographical purposes and because they were used in the past for the design of nuclear power plants which are still in operation.