IEC 60038:2009+A1:2021规定了标准电压值，这些标准电压值旨在作为供电系统标称电压的优先值，以及作为设备和系统设计的参考值。这第七次构成技术修订。重大技术变更为: -将230V(50Hz)和230/400V(60Hz)的值添加到表1中； -参考相关标准和信息性附件取代低压的使用电压范围； -在表3中添加30kV的值； -将表5中的1 050 kV值替换为1 100 kV。 根据IEC指南108，它具有水平标准的地位。

IEC 60038:2009+A1:2021 specifies standard voltage values which are intended to serve as preferential values for the nominal voltage of electrical supply systems, and as reference values for equipment and system design. This seventh constitutes a technical revision. The significant technical changes are:
- the addition of the values of 230 V (50 Hz) and 230/400 V (60 Hz) to Table 1;
- the replacement of the utilization voltage range at LV by a reference to the relevant standard and an informative annex;
- the addition of the value of 30 kV to Table 3;
- the replacement of the value of 1 050 kV by 1 100 kV in Table 5.
It has the status of a horizontal standard in accordance with IEC Guide 108.