1.1 本规程具体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 这种做法适用于人可进入和人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。本标准不包括其他计量单位。 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、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 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或雨水，或两者兼有。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。 5.2 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。 5.3 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 standard. No other units of measurement are included in this standard. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 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 or storm water, or both. 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. 5.2 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. 5.3 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.