请注意:此版本的所有临时修订版将在您购买时提供。这些要求中所述的试验方法旨在评估电缆的耐火性能，该性能是在试验过程中通过功能性测量的 暴露于火灾期间，以及暴露于软管流之后。为了在火灾暴露期间保持电缆的功能，使用耐火屏障对电缆进行测试。防火屏障是电缆 护套，如果护套设计用于提供耐火性。如果电缆护套的设计不是为了提供耐火性，则应将电缆 在防火屏障内或安装在每小时额定防火组件内（参见）。拟安装非耐火电缆的耐火电缆 屏障（如导管）使用非耐火屏障进行测试，该屏障作为试样的一部分。否则，包含耐火电缆的耐火电缆 导管架在没有任何障碍物的情况下进行测试。为了证明每根电缆在测试过程中的功能，在测试的火灾暴露部分向电缆施加电压和电流，以及 监控电缆的电气和视觉性能。在软管喷射期间，电缆未通电，但在软管喷射后对其进行目视检查和电气测试 软管喷雾。

Please note: All interim revisions for this edition available at time of your purchase will be included.The test method described in these requirements is intended to evaluate the fire resistive performance of electrical cables as measured by functionality during a period of fire exposure, and following exposure to a hose stream.To maintain the functionality of electrical cables during a fire exposure the cables are tested using a fire resistive barrier. The fire resistive barrier is the cable jacketing if the jacketing is designed to provide fire resistance. If the cable jacketing is not designed to provide fire resistance, the electrical cables are either placed within a fire resistive barrier or installed within an hourly rated fire resistive assembly (see ). Fire resistive cables intended to be installed with a non-fire resistive barrier (such as conduit) are tested with the non-fire resistive barrier included as part of the test specimen. Otherwise fire resistive cables incorporating a fire resistive jacket are tested without any barrier.To demonstrate each cable's ability to function during the test, voltage and current are applied to the cable during the fire exposure portion of the test, and the electrical and visual performance of the cable is monitored. The cable is not energized during the hose spray, but it is visually inspected and electrically tested after the hose spray.