北美UL认证线材颜色选择的最新变化
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来源: 未知
发布日期:2021-05-10
出口北美的UL认证的产品,无论是控制器还是其它任何产品,如果直接用于现场端安装的话, UL认证标准里面有一个约定俗称的规定 就是黑色代表火线,白色代表零线, 且电源线的线径至少是18AWG以上。
对于输出端以及调光线的颜色,一般都没有规定, 调光线常见以灰色或者紫色为主,但是最近美国电工法2020版(NEC 2020), 有一条新要求,涉及条件条款为410.69。
强制生效日期:2022-01-01日。
最新要求:用于安装现场连接的调光线, 它的颜色不能和 零线和地线的颜色一样,所以不能使用灰色gray的调光线了。如果一定要使用灰色gray的调光线, 线头部分必需重新标识(比如加其它颜色的marking tape等等)
NEC 2020 410.69的章节原文:
Identification of Control Conductor Insulation: Where control conductors are spliced, terminated, or Connected in the same luminaire or enclosure as the branch-circuit conductors, the filed-connected control conductor shall not be of a color reserved for the grounded branch-circuit conductors or the equipement grounding conductor. This requirement shall become effective January 1, 2022.
Informational Note: Sec 200.6 for identification of grounded conductor and 250.119 for identification of equipment grounding conductor.
Exception: A field-connected gray-colored control conductor shall be permitted if the insulation is permanently re-identified by marking tape, painting, or other effective means as its termination and at each location where the conductor is visible and accessible. Identification shall encircle the insulation and shall be a color other than white, gray or green.
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