1. Referring to GB/T 19666-2005, unless otherwise specified, the standard Class C rating is used.
2. If no specific information is provided, the product is flame-retardant Class C.
3. We also manufacture according to Class C.
4. Since ZR doesn't specify anything, it can be interpreted in any way. Why ask whether it's Class B or Class C? I doubt even those of us working with cables know what the model numbers mean, let alone those outside the industry. Standardization is highly anticipated!
5. Flame-retardant wires and cables comply with different flame-retardant standards, resulting in different grading and presentation methods. For example, GA306-2001, "Flame-retardant and Fire-resistant Cables: Classification and Requirements for Plastic Insulated Flame-retardant and Fire-resistant Cables," stipulates that flame-retardant cables are classified into four grades, each divided into three categories: A, B, and C. For example, ZR-ⅡB indicates Class B flame-retardant grade II. For example, GB/T19666-2005 "General Rules for Flame Retardant and Fire Resistant Wires and Cables" stipulates that flame retardancy is divided into four categories: ZA, ZB, ZC, and ZD. There is no way to express ZR at all.
