本标准旨在为工厂环境外通信网络设备中使用的设备外壳和组件提供防火风险评估标准。拟安装在制造商安装指南中所列地面（建筑物屋顶）以上9 m（30 ft）高度的产品，或内部容积小于0.225 m3（8 ft3）的产品可免于物理测试，但测试报告中必须包含豁免的理由。

The purpose of this standard is to provide fire protection risk assessment criteria for equipment enclosures and assemblies used in communications network equipment outside plant environments. Products intended to be mounted at a height greater than 9 m (30 ft) above the ground (roof of a building) as listed in the manufacturer's installation guide, or products with an internal volume less than 0.225 m3 (8 ft3), are exempt from physical testing, however rationale for the exemption must be included in a test report.