增压级-CMP级（送风燃烧测试/斯泰钠风道实验Plenum Flame Test/Steiner TunnelTest）
Pressurization level - CMP level (air supply combustion test / Steiner tunnel test)
这是 UL防火标准中要求最高的电缆（Plenum Cable），适用安全标准为UL910，实验规定在装置的水平风道上敷设多条试样，用87.9KW煤气本生灯（300，000BTU/Hr）燃烧20分钟。合格标准为火焰不可延伸到距煤气本生灯火焰前端5英尺以外。光密度的峰值最大为0.5，平均密度值最大为0.15。
This is the highest required plenum cable in UL fire protection standard. The applicable safety standard is ul910. According to the experiment, multiple samples are laid on the horizontal air duct of the device and burned for 20 minutes with 87.9kw gas Bunsen burner (300000btu / HR). The qualification standard is that the flame shall not extend beyond 5 feet from the flame front end of the Bunsen burner. The maximum peak value of optical density is 0.5, and the maximum average density is 0.15.
这种CMP电缆通常安装在通风管道或空气处理设备使用的空气回流增压系统中，被加拿大和美国所认可采用。符合UL910标准的FEP/PLENUM材料，阻燃性能要比符合IEC60332-1及IEC60332-3标准的低烟无卤材料的阻燃性能好，燃烧起来烟的浓度低。
This kind of CMP cable is usually installed in the air return pressurization system used in the ventilation pipe or air treatment equipment, and is approved by Canada and the United States. FEP / plenum materials complying with ul910 standard have better flame retardancy than low smoke and halogen-free materials complying with iec60332-1 and iec60332-3 standard, and the smoke concentration is low when burning.