1.1 本指南涵盖了在许可证要求的受限空间救援行动中使用的硬线通信系统的推荐选择标准。 1.2 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。 1.3 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。 ====意义和用途====== 4.1 由于受限许可证的许多独特要求- 太空救援行动和一些密闭空间的具体结构和组成，强硬的通信系统可能是唯一能满足在这些空间内工作要求的类型。其中一些要求在联邦法规中有所规定，另一些要求则由行业为在密闭空间工作制定的安全操作程序规定。 4.2 本指南并不排除在密闭空间救援中使用其他类型的通信系统。

1.1 This guide covers recommended criteria for the selection of hardwire communication systems for use in permit-required confined-space rescue operations. 1.2 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. 1.3 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 Because of the many unique requirements of permit-required confined-space rescue operations and the specific construction and composition of some confined spaces, hardline communications systems may be the only type that will meet the requirements for working within these spaces. Some of these requirements are set forth in federal regulations and some by safe operating procedures developed for working in confined spaces by industry. 4.2 This guide is not meant to preclude the use of other types of communication systems in confined-space rescue.