有一款线中提到CL2R, 到底什么是CL2R呢。具体标准要参照哪个呢？

还有ZIP cable 是怎么样的线呢？平行线吗？

1 Scope
1.1 These requirements cover 60 – 250°C (140 – 482°F) single- and multiple-conductor power-limited
circuit cables for use as fixed wiring within buildings (some are also marked for direct burial) principally for
Class 3 and Class 2 circuits as described in Article 725 and other applicable parts of the National
Electrical Code (NEC). Cables covered by these requirements are:
a) Types CL3P and CL2P (plenum cables),
b) Types CL3R and CL2R (riser cables),
c) Types CL3 and CL2 (commercial cables for other than plenum, riser, or tray uses),
d) Types CL3X and CL2X (cables for limited use), and
e) Type PLTC (cable for non-plenum and non-riser Class 3 and Class 2 circuits in general and
in trays).
1.2 Cables for Class 3 circuits are rated for 300 volts but are not so marked. Cables for Class 2 circuits
do not have a voltage rating. See 40.1 (h).

具体请参见UL13标准

谢谢啦。就是不知道具体是怎么样的，什么标准都要钱。。

21 Type CL3R和CL2R电缆的燃烧试验

21.1 Type CL3R和CL2R电缆应遵从UL1666安装于垂直竖井中的电线和光缆的火焰传播高度之要求。见1.6（b）。电缆芯线遵从UL 1581中Section 1100热塑和橡胶绝缘电线电缆之水平试样燃烧测试要求，若厂商生产的最小直径的电缆通过此要求，则可认为相同结构的其它直径的电缆也符合要求。

21.2  HDPE,LDPE,或PP绝缘，以及电缆芯线不遵从UL 1581中Section 1100热塑和橡胶绝缘电线电缆之水平试样燃烧要求的电缆，测试试样代表每种结构的所有规格范围。一般说来，测试试样是厂商生产此种结构的最大和最小电缆直径。

PS:关于UL13标准我早就发贴放上来了.

http://www.dxdlw.com/ShowPost.asp?ThreadID=65735

是UL13中的一种燃烧等级。