李荣茂（中船第九设计研究院工程有限公司，上海市 200063）
“Gray Area”in Engineering Earthing
Li Rongmao（China Shipbuilding NDRI Engineering Co.，Ltd.，Shanghai 200063，China）
Abstract At present the technical codes about earthing are uniform in China and the technical codes about earthing in some foreign countries do not implement according to IEC standards． Combined with relevant codes and standards， some engineering examples are given and some specious operating methods in engineering earthing are analyzed and expatiated．
Key words T T system Iterative earthing One-point earthing Common earthing device Attribute of the 4th pole
摘 要 目前国内有关接地的技术规范没有统一的做法，而国外也存在不按照IEC标准实施的情况。本文结合国内外相关规范、标准，例举了一些工程实例，分析阐述了工程接地中似是而非，似错非错的做法。
关键词 T T系统 重复接地 一点接地 共用接地装置 第四极属性
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