在美國UL安規當中，數據線纜防火等級分為CM、CMR、CMP三個等級：

CM：普通防火等級，一般使用於普通家庭和一般辦公場所等;

CMR：優於CM防火等級，具有一定阻燃效果，適用於醫院、商業綜合體等場所等;

CMP：最高的防火等級，阻燃性高，適用於大型數據中心、媒體中心、金融中心、會展中心、博物館等場所的建築物。

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What types of network cables have fire rating?

In the US UL safety regulations, the data cable fire rating is divided into three levels: CM, CMR, and CMP:

CM: general fire rating, generally used in ordinary households and general office places;

CMR: It is superior to CM fire rating and has certain flame retardant effect. It is suitable for hospitals, commercial complexes, etc.;

CMP: The highest fire rating and high flame retardancy, suitable for large data centers, media centers, financial centers, convention centers, museums and other places.

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