1.1 本指南仅涉及与在现有下水道中建造、安装、维护或更换光纤网络相关的主要安全问题、地役权、可施工性、各方责任以及风险管理。 1.2 本标准的文本引用了提供解释材料的注释和脚注。这些注释和脚注（不包括表和图中的注释和脚注）不应视为本标准的要求。 1.3 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，并确定监管要求的适用性。 看见 4. 1. 和 5.1 – 5.1.7 具体安全信息。 1.4 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====== 4.1 必须解决安全因素，并将其纳入工作中，以保护工人和公众，并且可能需要相应地改变施工活动。工程和施工成本是分析的一部分。 4.2 在项目设计中应考虑工程的使用权。 4.3 在类似预期工作范围的施工活动中具有现场经验的施工专业人员应在项目开始之前审查可施工性计划。 4.4 应考虑适当的保险和担保关系，以保护协议或合同各方的利益。 4.5 风险管理评估将确定处于最佳控制地位并对不同风险负责的各方。

1.1 This guide addresses only primary safety concerns, easements, constructability, liability of the various parties, and risk management related to constructing, installing, maintaining, or changing an optical fiber network in an existing sewer. 1.2 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard. 1.3 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 requirements prior to use. See 4.1 and 5.1 – 5.1.7 for specific safety information. 1.4 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 ====== 4.1 Safety factors must be addressed and incorporated into the work to protect the workers and the public, and construction activities may need to be altered accordingly. Engineering and construction costs are a part of the analysis. 4.2 Access rights to the work should be considered in the design of the project. 4.3 A construction professional, who has field experience in construction activities similar to the scope of work anticipated, should review the plans for constructability prior to starting the project. 4.4 Proper insurance and surety bonding to protect the interests of all parties to the agreement or contract should be considered. 4.5 Risk management assessment will identify the parties that are in the best position to control and be responsible for the different risks.