1.1本规程专门阐述了确定重力下水道是否适合二次使用（如安装光纤系统）的标准。 1.1.1本规程适用于选择适合接受光纤系统的重力下水道的过程，而不是下水道内此类系统的安装、操作和维护标准。 1.2本规程适用于可进入和不可进入的下水道系统。 1.3以英寸-磅为单位的数值应视为标准值。括号中提供的值仅供参考。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 ====意义和用途====== 本规程旨在帮助工程师和下水道所有者/运营商确定下水道作为光纤电缆和导管主机的二次使用的适用性。必须记住，下水道的主要用途是输送废水和/或雨水。系统的任何二次使用不得显著影响一次使用。 由工程师决定选择过程中可能涉及的任何例外情况。 在选择程序开始之前，安装人员必须获得业主/运营商的明确授权，允许对其下水道系统内的光缆或导管的安装进行评估。 工程师和业主还应了解光纤电缆或导管的安装将如何影响下水道未来的运营、维护和修复需求。

1.1 This practice specifically addresses the criteria for determining the suitability of gravity sewers for secondary uses such as the installation of optical fiber systems. 1.1.1 This practice applies to the process of selecting gravity sewers that are appropriate for accepting an optical fiber system as opposed to standards for the installation, operation and maintenance of such system within sewers. 1.2 This practice applies to both man accessible and man inaccessible sewer systems. 1.3 The values stated in inch-pound units are to be regarded as the standard. The values provided in parentheses are for information purposes only. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== This practice is intended to assist engineers and sewer owner/operators in determining the suitability of sewers for a secondary use as hosts for optical fiber cables and conduits. It must be kept in mind that the primary use of the sewers is to carry wastewater and/or storm water. Any secondary use of the system shall not significantly impair the primary use. It is up to the engineer to decide upon any exceptions that may be involved in the selection process. Before the selection procedure begins, the installer must have explicit authorization from the owner/operator allowing an evaluation to be conducted for the installation of optical fiber cables or conduits within their sewer system. Engineers and owners should also be cognizant of how the installation of optical fiber cable or conduits will impact the future operational, maintenance and rehabilitation needs of the sewers.