1.1 本规范涵盖地下通信和电力电线电缆用单壁和共挤蜂窝芯光滑壁聚氯乙烯导管和配件的要求。不符合第节规定的材料要求的塑料 5. 被排除在单层和所有共挤出层之外。 1.2 括号中给出的值仅供参考。 1.3 以下安全隐患警告仅适用于试验方法部分，第节 8. ，本规范的: 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。

1.1 This specification covers the requirements for single wall and coextruded cellular core smooth-wall poly(vinyl chloride) conduit and fittings for underground communication and electrical power wire and cables. Plastics which does not meet the material requirements specified in Section 5 is excluded from single layer and all coextruded layers. 1.2 The values given in parentheses are for information only. 1.3 The following safety hazards caveat pertains only to the test method portion, Section 8 , of this specification: 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. 1.4 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.