1.1 本规范涵盖了在实际范围内获得普通实验室和工业应用的球形接地接头互换性的标准尺寸要求。它仅涵盖地面的尺寸互换性，不涉及项目的设计特性，除非另有说明，也不涉及所用材料的物理或化学特性。 附注1: 与球形接地接头相关的尺寸取自美国商业标准CS 21-58。商务部。 附注2: 虽然玻璃是最常用于接地接头的材料，但也可以按照规定使用其他材料。由玻璃制成的球形接头应符合规范 E438 和 E671 . 1.2 以下注意事项仅适用于试验方法部分，章节 4 本说明书的。 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。 1.3 本国际标准是根据世界贸易组织技术性贸易壁垒（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》中确立的国际公认的标准化原则制定的。

1.1 This specification covers standard dimensional requirements for obtaining, within practical limits, interchangeability in spherical ground joints for ordinary laboratory and industrial applications. It covers dimensional interchangeability of the ground surfaces only and does not involve design characteristics of the item except where specified, nor does it involve physical or chemical characteristics of the material used. Note 1: The dimensions pertaining to spherical ground joints were taken from the Commercial Standard CS 21–58 of the U.S. Department of Commerce. Note 2: Although glass is the most commonly used material for ground joints, other materials may be used as specified. Spherical joints constructed from glass shall conform to Specifications E438 and E671 . 1.2 The following precautionary caveat pertains only to the Test Method portion, Section 4 , 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. 1.3 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.