IEC 60695-2-21:20 23是一项技术规范，规定了成品单元的防火测试方法。旨在验证成品单元内部有效点火源产生的火灾事件的遏制能力。 除非相关产品标准另有规定，否则本文件所述的耐火度测定不适用于以下任何情况: -单个电气部件； -当结合到成品单元中时的单个电气部件； -配电板、电路保护装置、开关设备、控制设备、电缆管理系统和电气附件（接线装置）等电气安装产品。

IEC 60695-2-21:2023, which is a Technical Specification, specifies a fire containment test method for finished units. It is intended to verify the capability of containing of a fire event generated by an effective ignition source inside a finished unit.
Unless otherwise specified by the relevant product standard, determination of the fire containment described in this document does not apply to any of the following:
- A single electrical component;
- A single electrical component when incorporated into a finished unit;
- Electrical installation products such as distribution boards, circuit protection devices, switchgear, controlgear, cable management system and electrical accessories (wiring devices).