美利体育登录入口官网:UL 515 CRD-2022 商业应用电阻伴热安全 UL 标准 部分/段落参考:12、13、14 主题:带安装孔的整体组件 用于管道、屋顶和排水沟除冰
UL Standard for Safety Electric Resistance Trace Heating for Commercial Applications - Section / Paragraph Reference: 12, 13, 14 Subject: Integral component with hole for mounting for pipe, and roof and gutter deicing